{"id":12122,"date":"2024-10-03T12:07:25","date_gmt":"2024-10-03T16:07:25","guid":{"rendered":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/gpm-celebrates-ten-years-of-observing-precipitation-for-science-and-society\/"},"modified":"2024-10-03T12:07:25","modified_gmt":"2024-10-03T16:07:25","slug":"gpm-celebrates-ten-years-of-observing-precipitation-for-science-and-society","status":"publish","type":"post","link":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/gpm-celebrates-ten-years-of-observing-precipitation-for-science-and-society\/","title":{"rendered":"GPM Celebrates Ten Years of Observing Precipitation for Science and Society"},"content":{"rendered":"<h2 style=\"text-align: center;\">GPM Celebrates Ten Years of Observing Precipitation for Science and Society<\/h2>\n<p><!-- no image --><\/p>\n<div class=\" hds-module hds-module-full wp-block-nasa-blocks-secondary-navigation\">\n<div class=\"hds-secondary-navigation-wrapper z-top width-100 padding-0\">\n<div 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maxw-full\">\n<p class=\"label carbon-60 margin-0 margin-bottom-3 padding-0\">40 min read<\/p>\n<h1 class=\"display-48 margin-bottom-2\">GPM Celebrates Ten Years of Observing Precipitation for Science and Society<\/h1>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>Introduction<\/strong><\/p>\n<p>On February 27, 2014, the four-ton <a href=\"https:\/\/gpm.nasa.gov\/missions\/GPM\" rel=\"noopener\">Global Precipitation Measurement<\/a> (GPM) Core Observatory (CO) spacecraft launched aboard a Japanese H-IIA rocket from Tanegashima Space Center in southern Japan. On that day, the GPM mission, a joint Earth-observing mission between NASA and the Japan Aerospace Exploration Agency (JAXA), began its journey to provide the world with an unprecedented picture of global precipitation (i.e., rain and snow). GPM continues to observe important precipitation characteristics and gain physical insights into precipitation processes using an advanced radar and passive microwave (PMW) radiometer on the GPM\u2013CO along with leveraging a constellation of satellites. (The Earth Observer <em>reported on the GPM\u2013CO launch and plans for the mission in its November\u2013December 2013 issue \u2013 see <a href=\"https:\/\/eospso.nasa.gov\/sites\/default\/files\/eo_pdfs\/Nov_Dec_2013_final_color.pdf#page=4\" rel=\"noopener\">GPM Core Observatory: Advancing Precipitation Instruments and Expanding Coverage<\/a>.) <\/em><\/p>\n<p>As GPM is now well into its 10<sup>th<\/sup> year in orbit, the time is fitting to reflect on and celebrate what this mission has accomplished and showcase its contributions to science and society. While occasionally dealing with equipment malfunction, the GPM\u2013CO has operated nearly continuously over its lifetime and recently was put into a higher orbit to conserve station-keeping fuel. As a result, GPM remains in extended operations and continues its observations after 10 years, making significant advances in the precipitation field through improving sensor calibration, retrieval algorithms, and ground validation measurements. GPM data continues to further our understanding of the characteristics of liquid and frozen precipitation around the world and improving our scientific knowledge of Earth\u2019s water and energy cycles. These advances have extended to numerous societal benefits related to operational weather prediction, situational awareness and prediction of extreme events, hydrological and climate model development, water resource and crop management activities, and public health alerts. Additionally, this information has informed the K\u201312 and post-secondary audiences, influencing the next generation of scientists. More information is available at NASA\u2019s <a href=\"https:\/\/gpm.nasa.gov\/\" rel=\"noopener\">GPM website<\/a>.<\/p>\n<p><strong>Advancing Precipitation Measurements: The Need for the GPM Mission<\/strong><\/p>\n<p>Precipitation is a vital component of global water and energy cycles and crucially impactful to life on Earth. The distribution, frequency, and extremes in precipitation affect everything from agriculture to the insurance industry, to travel and your weekend plans. Prior to the meteorological satellite era, precipitation observations were limited to populated areas leaving wide swaths of land and almost the entirety of the oceans (70% of Earth\u2019s surface) unobserved. GPM builds on decades of advances in satellite precipitation observations.<\/p>\n<p>Early precipitation observations from space (e.g., from the <a href=\"https:\/\/eospso.nasa.gov\/sites\/default\/files\/eo_pdfs\/Mar_Apr_2015_color_508.pdf#page=18\" rel=\"noopener\">Nimbus series<\/a>) used visible and infrared measurements that gave the first, approximate estimates. PMW radiometers, however, gave a next generation of more direct and improved precipitation measurement. The NASA\u2013JAXA <a href=\"https:\/\/gpm.nasa.gov\/missions\/trmm\" rel=\"noopener\">Tropical Rainfall Measuring Mission<\/a> (TRMM), launched in November 1997, significantly advanced the field with the addition of a Precipitation Radar (PR) alongside a wider-swath PMW radiometer. This was groundbreaking for precipitation research and advancement of measurement techniques, but was limited to the tropics and a single satellite in low Earth orbit. To move toward the goal of a globally distributed, high-frequency, physically consistent satellite precipitation product a new mission design was conceived in GPM.<\/p>\n<p><strong>The GPM Mission: Science Requirements, Objectives, and Instruments<\/strong><\/p>\n<p>The GPM\u2013CO spacecraft is an advanced successor to the TRMM spacecraft, providing additional channels on both the Dual-frequency Precipitation Radar (DPR) and the GPM Microwave Imager (GMI) to enhance capabilities to sense light rain and falling snow. The GPM\u2013CO, another NASA\u2013JAXA partnership, operates in an inclined, non-Sun synchronous orbit that allows the spacecraft to sample precipitation across all hours of the day, as did TRMM. However, TRMM only covered tropical and subtropical regions, while the GPM\u2013CO also covers middle and sub-polar latitudes.<\/p>\n<p>The GPM mission has several key scientific objectives, including:<\/p>\n<ol>\n<li>advancing precipitation measurements from space;<\/li>\n<li>improving our knowledge of precipitation systems, water cycle variability, and freshwater availability;<\/li>\n<li>improving climate modeling and prediction;<\/li>\n<li>improving weather forecasting and four-dimensional [4D \u2013 i.e., three-dimensional (3D) spatial plus temporal] reanalysis; and<\/li>\n<li>improving hydrological modeling and prediction.<\/li>\n<\/ol>\n<p><em>GPM Core Observatory Instruments<\/em><\/p>\n<p>The GMI and DPR instruments together provide a powerful synergistic tool to assess precipitation structure, intensity, and phase globally at relatively high (regional) spatial resolutions. The DPR\u2019s K<sub>u<\/sub>-band (13.6 GHz) and K<sub>a<\/sub>-band (35.5 GHz) channels provide 3D retrievals of precipitation structure with a vertical resolution of 250 m (~820 ft) and a horizontal resolution of ~5 km (~3 mi) across a swath up to 245 km (152 mi). The GMI is a 13-channel conically scanning PMW radiometer providing observations across a wide swath [885 km (~550 mi)] to estimate precipitation estimates at resolutions as fine as 5 km \u2013 see <strong>Figure 1<\/strong>.<\/p>\n<p>When scientists and engineers collaborated on the design of GMI, they knew it would need to meet exacting requirements so that its data could be used both to support development of precipitation retrieval algorithms and to provide a calibration standard for the partner sensors in the GPM constellation. The attention to detail has paid off. To this day, GMI is deemed to be one of the best calibrated conically scanning PMW radiometers in space.<\/p>\n<p>Together, these two well-calibrated GPM\u2013CO instruments gather scientifically advanced observations of precipitation between 68\u00b0N and 68\u00b0S \u2013 which covers where the majority of the Earth\u2019s population falls. This coverage allows opportunities to observe both surface precipitation rates and 3D precipitation structure and allows observations of diverse weather systems, including hurricanes and typhoons (e.g., from formation to their transition from the tropics to midlatitudes), severe convection, falling snow, light rain, and frontal systems over both land and ocean.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"1294\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 1\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=300,270 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=768,690 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=1024,920 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=400,359 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=600,539 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=900,809 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-1.png?resize=1200,1078 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 1. <\/strong>Schematic diagram of the GPM Core Observatory\u2019s Dual-frequency Precipitation Radar (DPR) and GPM Microwave Imager (GMI) instruments. <\/div>\n<div class=\"hds-credits\"><strong>Figure credit<\/strong>: GPM website<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p><em>GPM Constellation<\/em><\/p>\n<p>While the GPM\u2013CO is a key component of the GPM mission, another fundamental component is the constellation of national and international partner satellites known as the <a href=\"https:\/\/gpm.nasa.gov\/missions\/GPM\/constellation\" rel=\"noopener\">GPM Constellation,<\/a> which has numbers ~10 at any given time \u2013 with the current members listed at the link referenced above. Each GPM Constellation partner designed and operated the satellites for their own particular missions, but they agreed to share the data from their missions to enable the next-generation of unified global precipitation estimates. The combination of these partner satellites and the GPM\u2013CO allow frequent intersections of their orbits, permitting colocated and cotemporal observations to be made, which are crucial to ensure effective intercalibration.<\/p>\n<p>The GPM\u2013CO serves as the \u201ccalibrator\u201d to unify precipitation estimates across these different partners\u2019 satellite sensors, ensuring that the observed microwave brightness temperatures (T<sub>B<\/sub>) are consistent among the sensors with expected differences after accounting for variations in the observing frequencies, bandwidths, polarizations, and view angles. The advanced calibration across the sensors is a remarkable achievement, and it allows the project to focus on the precipitation products rather than T<sub>B<\/sub> uncertainties. This careful calibration enables high-quality datasets that support and enable detailed investigations on the distribution of precipitation and how these patterns change over days, seasons, and years, enabling a breadth of science and societal applications at local and global scales.<\/p>\n<p><strong>Ground Validation Activities: Significant Contributions to the GPM Mission<\/strong><\/p>\n<p>An integral part of a successful satellite mission is a robust and active ground validation (GV) program. During the TRMM era, the TRMM PR, and\/or the TRMM PMW radiometer instruments limited GV to simple comparisons of rain rates to surface measurements from radars and\/or rain gauges, which is referred to as <em>statistical validation<\/em>. It soon became obvious that a more robust GV program would be needed to better aid future satellite algorithm developers to improve the physics of their algorithms rather than just justifying tweaking their outputs. As a result, unlike TRMM, GPM\u2019s GV program has been part of the mission concept from its inception. The GPM team developed a three-tiered approach that uses: \u00a0<em>statistical validation<\/em>, as done during TRMM; <em>physical validation, <\/em>where the emphasis is on better understanding of the physics and microphysics of different precipitating systems; and <em>hydrological validation<\/em>, which emphasizes improving precipitation retrievals over large-scale areas (e.g., watersheds).<\/p>\n<p>To address these goals, there have been several pre- and post-launch field campaigns conducted. In chronological order, these include the:<\/p>\n<ul>\n<li><a href=\"https:\/\/doi.org\/10.5067\/gpmgv\/lpvex\/radiosonde\/data101\" rel=\"noopener\">Light Precipitation Evaluation Experiment<\/a> (LPVEx), a prelaunch field campaign taking place in September and October 2010 over the Gulf of Finland;<\/li>\n<li><a href=\"https:\/\/doi.org\/10.5067\/GPMGV\/GCPEX\/DATA101\" rel=\"noopener\">GPM Cold Season Precipitation Experiment<\/a> (GCPEX) over and near the Ontario, Canada\/Great Lakes Environment Canada Centre for Atmospheric Research Experiments (CARE) from January 17 to February 29, 2012;<\/li>\n<li><a href=\"https:\/\/doi.org\/10.5067\/GPMGV\/MC3E\/DATA101\" rel=\"noopener\">Mid-Latitude Continental Convective Cloud Experiment<\/a> (MC3E) in north\u2013central Oklahoma, April 22 to June 6, 2012;<\/li>\n<li><a href=\"https:\/\/ghrc.nsstc.nasa.gov\/uso\/ds_details\/collections\/gpmifldC.html\" rel=\"noopener\">Iowa Flood Studies<\/a> (IFloodS)) in eastern Iowa, May 1 to June 15, 2013;<\/li>\n<li><a href=\"https:\/\/ghrc.nsstc.nasa.gov\/uso\/ds_details\/collections\/gpmiphxC.html\" rel=\"noopener\">Integrated Precipitation &#038; Hydrology Experiment<\/a> (IPHEx) from May 1 to June 15, 2014, in the mountains of central North Carolina; and<\/li>\n<li>\u00a0<a href=\"https:\/\/ghrc.nsstc.nasa.gov\/uso\/ds_details\/collections\/gpmolyxC.html\" rel=\"noopener\">Olympic Mountain Experiment<\/a> (OLYMPEX), the last full-scale, postlaunch, and GPM-sponsored field campaign \u2013 and one of the most logistically challenging \u2013 conducted over the Olympic Peninsula and adjacent waters from November 1, 2015 to January 31, 2016.<\/li>\n<\/ul>\n<p>Each of these field campaigns were designed to provide insight into different precipitation regimes and types to improve GPM satellite observations. For example, MC3E allowed for comprehensive observations of intense convection over continental regions. The researchers deployed an extensive network of ground instruments (e.g., radars, disdrometers, rain gauges), in coordination with flights of NASA\u2019s ER-2 and University of North Dakota\u2019s Cessna <em>Citation II <\/em>research aircrafts, to sample varied precipitation types (e.g., severe thunderstorms, Mesoscale Convective Systems (MCS)). Data from MC3E allowed for improvement of both active (DPR) and passive (GMI) retrievals over land. GCPEx has allowed for sampling of snowing systems. During this campaign, NASA\u2019s ER-2 flew high above the clouds in coordination with NASA\u2019s DC-3 aircraft flying within the clouds. Here again, GCPEx participants deployed a vast network of ground instruments (e.g., snow gauges, disdrometers). The goal for GCPEx was to formulate and validate frozen\/mixed precipitation retrievals from the GPM satellite. (Note that from 2011\u20132015, <em>The Earth Observer<\/em> published articles on five of the six GV campaigns described in this section; the reader can locate these articles on <em>The Earth Observer<\/em> <a href=\"https:\/\/science.nasa.gov\/earth-science\/the-earth-observer\/archives\/\" rel=\"noopener\">Archives Page<\/a>. Scroll down to the \u201cBibliography of Articles with Historical Context Published in <em>The Earth Observer<\/em>\u201d listicle and look for <em>Field Campaigns<\/em>.)<\/p>\n<p>While these large-scale campaigns were extremely beneficial for achieving GPM science objectives, the costs of deploying instruments and personnel in these remote regions can be substantial. In order to provide long-term measurements at reasonable costs, the GPM GV established the Precipitation Research Facility (PRF) at the Wallops Flight Facility (WFF). The goal of this facility was to provide long-term measurements from the myriad instruments that have been deployed at the various field campaigns and manage them with full-time GV personnel. The linchpin of the PRF is <a href=\"https:\/\/www.earthdata.nasa.gov\/sensors\/npol\" rel=\"noopener\">NASA\u2019s S-band, Dual-Polarimetric Radar<\/a> (NPOL) \u2013 see <strong>Photo 1<\/strong>. NPOL was deployed in a farm field about 38 km (~24 mi) northeast of WFF to provide areal estimates of surface precipitation as well as profiles of precipitating systems above other GV surface instruments (e.g., profiling radars, disdrometers, and rain gauges). To add to this effort, the PRF staff established a network of rain gauges and disdrometers, which are deployed over the eastern shore of Maryland. These data are telemetered so that an added benefit to this effort is that the GPM GV data provide valuable, near-real-time data to many of the numerous farmers on the Delmarva Peninsula. The PRF\u2019s principal activity is to design new GV instruments, test new validation methods, and assess instrument uncertainties using the abundant infrastructure of the GPM GV validation program. This coordination between GPM GV instruments, WFF-based staff, and regional data collection, quality control, and analysis are the core components of the PRF.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"988\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Photo 1\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=300,206 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=768,527 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=1024,703 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=400,274 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=600,412 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=900,618 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-1.jpg?resize=1200,823 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Photo 1. <\/strong>The NASA S-Band Dual Polarimetric Radar (NPOL) deployed in central Iowa in support of the IFloodS field campaign in Iowa during the spring of 2013. The radar, when disassembled, fits within the five, white sea-containers located around the radar in this photo; it can be transported via 18-wheelers. In addition to IFloodS, NPOL has also been deployed for field campaigns in Oklahoma (MC3E), North Carolina (IPHEx), and Washington (OLYMPEX) \u2013 all of which are mentioned in the text above.<\/div>\n<div class=\"hds-credits\"><strong>Photo credit<\/strong>: David Wolff\/WFF<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p><strong>GPM Data Products<\/strong><\/p>\n<p>GPM data products and services have played an important role in research, applications, and education. The <a href=\"https:\/\/arthurhou.pps.eosdis.nasa.gov\/\" rel=\"noopener\">Precipitation Processing System<\/a> (PPS) housed at NASA\u2019s Goddard Space Flight Center (GSFC) produces and distributes GPM products that are archived and distributed at the <a href=\"https:\/\/disc.gsfc.nasa.gov\/\" rel=\"noopener\">Goddard Earth Sciences Data and Information Services Center<\/a> (GES DISC) as well.<\/p>\n<p>GES DISC is one of a dozen discipline-oriented <a href=\"https:\/\/www.earthdata.nasa.gov\/eosdis\/daacs\" rel=\"noopener\">Distributed Active Archive Centers<\/a> (DAACs) that NASA operates for processing the terabytes of data returns from its satellites, aircraft, field campaigns, and other sources. (<em>To learn more about Earth Science Data Operations, which includes the DAACs, see <a href=\"https:\/\/eospso.nasa.gov\/sites\/default\/files\/eo_pdfs\/March%20April%202017%20color%20508.pdf#page=4\" rel=\"noopener\">Earth Science Data Operations: Acquiring, Distributing, and Delivering NASA Data for the Benefit of Society<\/a>. <\/em>The Earth Observer<em>, Mar\u2013Apr 2017, <strong>29:2<\/strong>, 4\u201318. \u00a0A chart listing all the DAACs appears on pp. 7\u20138 of this article.)<\/em><\/p>\n<p>In addition to precipitation estimates, users can access <a href=\"https:\/\/gpm.nasa.gov\/data\/directory\" rel=\"noopener\">variables<\/a>, such as calibrated T<sub>B<\/sub>, radar reflectivity, latent heating, and hydrometeor profiles in GPM products. See the <strong>Table 1<\/strong> below for a listing of NASA GPM data products.\u00a0<\/p>\n<p><strong>Table 1<\/strong>. Overview of GPM data collection.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Product Level<\/strong><strong><\/strong><\/td>\n<td><strong>Products and Description<\/strong><strong><\/strong><\/td>\n<\/tr>\n<tr>\n<td>Level 1 (L1)<sup>1<\/sup><\/td>\n<td><em>1A<\/em> \u2013 Reconstructed, unprocessed instrument data at full resolution for GPM GMI; <em>TRMM TMI 1B <\/em>\u2013 Brightness temperatures (T<sub>b<\/sub>) for GPM GMI; and <em>TRMM TMI, PR, and VIRS1C <\/em>\u2013 Calibrated T<sub>b<\/sub> for GPM GMI, TRMM TMI, and a constellation of PMW radiometers.<\/td>\n<\/tr>\n<tr>\n<td>Level 2 (L2)<sup>2<\/sup><\/td>\n<td><em>2A Radar<\/em> \u2013 Single-orbit radar rainfall estimates for GPM DPR, K<sub>a<\/sub>, K<sub>u<\/sub>; <em>TRMM PR2A Radiometer (GPROF &#038; PRPS) <\/em>\u2013 Single-orbit PMW rainfall estimates from GPM GMI, TRMM TMI, and constellation radiometers; <em>2B Combined<\/em> \u2013 Single-orbit rainfall estimates from combined radar\/radiometer data (e.g., GPM GMI &#038; DPR; and TRMM TMI &#038; PR); and <em>2H CSH<\/em> \u2013 Single-orbit cloud (latent) heating estimates from combined radar\/radiometer data (GPM GMI &#038; DPR, TRMM TMI &#038; PR).<\/td>\n<\/tr>\n<tr>\n<td>Level 3 (L3)<sup>3<\/sup><\/td>\n<td><em>IMERG Early Run <\/em>\u2013 Near real-time, low-latency gridded global multi-satellite precipitation estimates; <em>IMERG Late Run<\/em> \u2013 Near real-time, gridded global multi-satellite precipitation estimates with quasi-Lagrangian time interpolation; and I<em>MERG Final Run <\/em>\u2013 Research-quality, gridded global multisatellite precipitation estimates with quasi-Lagrangian time interpolation, gauge data, and climatological adjustment. <em>3A Radar<\/em> \u2013 Gridded rainfall estimates from radar data (GPM DPR, TRMM PR). <em>3A Radiometer (GPROF)<\/em> \u2013 Gridded rainfall estimates from GPM GMI, TRMM TMI, and constellation PMW radiometers; <em>3B Combined<\/em> \u2013 Gridded rainfall estimates from combined radar\/radiometer data (GPM GMI &#038; DPR, TRMM TMI &#038; PR); <em>3G CSH <\/em>\u2013 Gridded cloud (latent) heating estimates from combined radar\/radiometer data (GPM GMI &#038; DPR, TRMM TMI &#038; PR).<\/td>\n<\/tr>\n<\/tbody>\n<\/table><figcaption class=\"wp-element-caption\"><strong>Product Definitions<\/strong>: <sup>1<\/sup><strong> Level 1 (L1): <em>L1A<\/em><\/strong> data are reconstructed, unprocessed instrument data at full resolution, time referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and georeferencing parameters (i.e., platform ephemeris), computed and appended \u2013 but not applied, to Level-0 (L0) data; <strong><em>L1B<\/em><\/strong> data are radiometrically corrected and geolocated L1A data that have been processed to sensor units; and <strong><em>L1C<\/em><\/strong> data are common intercalibrated brightness temperature (T<sub>b<\/sub>) products that use the GPM Microwave Imager (GMI) L1B data as a reference standard.<sup> 2<\/sup><strong>Level 2 (L2) <\/strong>products are derived geophysical parameters at the same resolution and location as those of the L1 data.<sup> 3<\/sup><strong>Level 3 (L3) <\/strong>products are geophysical parameters that have been spatially and\/or temporally resampled from L1 or L2 data.<\/figcaption><\/figure>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1037\" height=\"24\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?w=1037\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Black Separator Line\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png 1037w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=300,7 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=768,18 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=1024,24 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=400,9 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=600,14 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=900,21 900w\" sizes=\"auto, (max-width: 1037px) 100vw, 1037px\"><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>List of acronyms used in Table <\/strong><em>(in order of occurrence)<\/em><strong>:<\/strong> GPM Microwave Imager (GMI); TRMM Microwave Imager (MI); TRMM Precipitation Radar (PR); Visible and Infrared Scanner (VIRS); Dual-frequency Precipitation Radar (DPR); Ku-band and Ka-band channels; GPM Profiling Algorithm (GPROF); Precipitation Retrieval and Profiling Scheme Algorithm (PRPS); Integrated Multi-satellitE Retrievals for GPM (IMERG); Goddard Convective-Stratiform (CSH) (Latent) Heating Algorithm.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1037\" height=\"24\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?w=1037\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Black Separator Line\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png 1037w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=300,7 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=768,18 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=1024,24 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=400,9 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=600,14 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=900,21 900w\" sizes=\"auto, (max-width: 1037px) 100vw, 1037px\"><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<p>Detailed information of each product and links for data access and visualizations are available on NASA <a href=\"https:\/\/gpm.nasa.gov\/data\/directory\" rel=\"noopener\">GPM Data Directory<\/a>.<\/p>\n<p>From the beginning, GPM was conceptualized as incorporating all available satellite data \u2013 not as a single-satellite mission. One of the key mission requirements of the PPS was to ensure that processing and reprocessing always include data from the TRMM era (starting in December 1997). Algorithm development would ensure that the same algorithm would be used to process both TRMM- and GPM-era data collected from the TRMM and GPM spacecrafts and the GPM constellation. As a result, an important part of this cross-mission processing is the intercalibration of PMW radiometers using GMI. Using data from the overlap period of GMI and TMI, TMI is intercalibrated to GMI and is then used to intercalibrate the radiometer data during the TRMM era. This intercalibration manifests itself in the intercalibrated brightness temperatures (T<sub>c<\/sub>) provided in the Level 1C (L1C) product for each radiometer. The GPM Profiling Algorithm (GPROF) retrieval uses these intercalibrated L1C products and guarantees consistent mission intercalibrated precipitation retrievals. For example, the L2 product stage that converts T<sub>B<\/sub> into precipitation estimates applies the same GPROF to the GPM constellation of PMW radiometers.<\/p>\n<p><em>Continued Improvement of GPM Algorithms<\/em><\/p>\n<p>One important achievement of GPM is the continued improvements in GPM\u2019s algorithms that produce the immense amount of precipitation data that are used by scientific researchers and stakeholders alike. <a href=\"https:\/\/gpm.nasa.gov\/science\/precipitation-algorithms\" rel=\"noopener\">GPM\u2019s five algorithms<\/a> \u2013 DPR-, GPROF-, Combined-, Convective-Stratiform Heating-, and Multisatellite \u2013 have all undergone version updates several times (e.g., Version 01\u201307), with additional updates planned for the next 1\u20134 years. Each update entails a tremendous amount of work behind the scenes from GPM\u2019s algorithm developers to ensure that quality data are available to the public.<\/p>\n<p>Each new version provides a complete reprocessing of the entire data record using the improved retrieval algorithms, based on validation against reliable GV data, feedback from users, new understanding of the processes, and improved techniques. This not only helps ensure a consistent data record and fair comparisons against past events but also helps refine and improve the data to capture precipitation phenomena more exactly. Just as an original photograph capturing a past event can be reanalyzed with new technology, reprocessing revisits the observed satellite instruments\u2019 \u201craw\u201d radiances and refines the process of converting them to the end product of precipitation quantities.<\/p>\n<p><em>\u201cWe know more now about the global rain and snowfall in, say, 2010, than we did when it actually happened.\u201d \u2013 <\/em><strong>George Huffman<\/strong><em> <\/em>[GPM Project Scientist]<\/p>\n<p>This process is an <em>inverse problem<\/em> that helps determine the physical quantities (e.g., precipitation rate) given the observed signal (e.g., microwave radiance). For precipitation, this retrieval process relies on complex algorithms and is by no means straightforward. This is an underconstrained problem where different combinations of physical quantities can give the same observed signal, especially for passive instruments. Thus it requires additional information or assumptions.<\/p>\n<p>The aim of each version in GPM is to have \u201cbetter\u201d estimates of the precipitation variables than the previous version. However, what better means can involve trade-offs. An excellent example is a change implemented from V06 to V07 in one of GPM\u2019s most widely-used products \u2013 the <a href=\"https:\/\/gpm.nasa.gov\/data\/imerg\" rel=\"noopener\">Integrated Multi-satellitE Retrievals for GPM<\/a> (IMERG) algorithm \u2013 which is NASA GPM\u2019s multisatellite product that combines information from the GPM satellite constellation to estimate precipitation over the majority of the Earth\u2019s surface. The resulting IMERG products provide near-global precipitation data at a resolution of 10 km (~6mi), every 30 minutes covering latitudes of 60\u00b0N\u201360\u00b0S, and are available at different latencies (<em>Early<\/em>, <em>Late<\/em>, and <em>Final<\/em>, as defined in Table 1) to cater to a range of end-user communities for operational and research applications. IMERG is particularly valuable over areas of Earth\u2019s surface that lack ground-based, precipitation-measuring instruments, including oceans and remote areas. Specifically, this change to IMERG V07 resulted in improvements towards the distribution of precipitation rates, allowing for a better representation of precipitation areas and extremes. However, it reduced correlation against ground reference data. Another example is the gauge adjustment process in IMERG that offers a substantial improvement at the expense of higher random error.<\/p>\n<p>The result of these intricate reprocessing cycles is a family of precipitation products that improves accuracy, a longer record, and expanding coverage, all while responding to feedback and requests from users. This is especially the case for downstream products like IMERG, which is widely used for science and applications due to its completeness and regularity, and inherits the improvements in each reprocessing cycle across the family.<\/p>\n<p><em>Meeting User Needs<\/em><\/p>\n<p>The number one requirement on PPS was to provide well-curated standard reference products with carefully curated provenience. For each data product version, a complete record is kept of spacecraft maneuvers and issues, data input issues, and data formats. This makes GPM data products a standard against which others can be compared and the standard products themselves improved.<\/p>\n<p>The GPM mission also requires near-real-time (NRT) products. As a research agency, NASA does not generally specify operational NRT requirements. Instead, these NRT products are usually provided on a \u201cbest effort\u201d basis. During its core mission (the first three years), PPS did have NRT requirements. Since then, PPS continues to fulfill these as budget permits. The half-hourly 0.1 x 0.1\u00ba L3 global IMERG products are provided in NRT with latency objectives for the IMERG Early (Late) run of 4+ (14+) hours after data collection.<\/p>\n<p>To facilitate data interoperability and interdisciplinary science, the PPS and the <a href=\"https:\/\/disc.gsfc.nasa.gov\/\" rel=\"noopener\">Goddard Earth Sciences Data and Information Services Center<\/a> (GES DISC) have developed value-added data services and products since the TRMM era, including data subsetting (spatial and temporal), L3 data regridding, <a href=\"https:\/\/www.unidata.ucar.edu\/software\/netcdf\/\" rel=\"noopener\">network common data form<\/a> (NetCDF) format conversion, remote data access (e.g., via <a href=\"https:\/\/www.opendap.org\/\" rel=\"noopener\">Open Data Access Protocol<\/a> (OPeNDAP), <a href=\"https:\/\/nomads.ncep.noaa.gov\/info.php?page=grads\" rel=\"noopener\">Grid Analysis and Display System (GrADS) Data Server<\/a> [GDS]), <a href=\"https:\/\/gpm.nasa.gov\/resources\/documents\/imerg-gis-geotiff-documentation\" rel=\"noopener\">NASA GIS translation of GPM data for various accumulation periods<\/a>, <a href=\"https:\/\/gpm-api.readthedocs.io\/en\/latest\/\" rel=\"noopener\">GPM Applications Programming Interface (<\/a>API), and data visualization tools. For example, the more technical <a href=\"https:\/\/asdc.larc.nasa.gov\/documents\/tools\/hdf.pdf\" rel=\"noopener\">Hierarchical Data Formats<\/a> (HDF) mission IMERG products are reformatted and accumulated to GIS-friendly additions in <a href=\"https:\/\/www.earthdata.nasa.gov\/technology\/geographic-tagged-image-file-format-geotiff#:~:text=GeoTIFF%2C%20an%20Open%20Geospatial%20Consortium,format%20for%20georeferenced%20raster%20imagery.\" rel=\"noopener\">Geographic Tagged Image File Format (<\/a>geoTIFF) format for both Early and Late Run IMERG products at 30-min, 3-hour, and 1-day temporal resolution. Other value-added products include the daily products for IMERG Early, Late, and Final Runs from GES DISC. Quick visualization tools, such as the <a href=\"https:\/\/gpm.nasa.gov\/data\/visualization\/global-viewer\" rel=\"noopener\">IMERG Global Viewer,<\/a> are freely available to the public to access and view the latest NRT GPM IMERG global precipitation datasets at 30-minute, 1-day, and 7-day intervals, on an interactive 3D globe in a web browser. User services and tutorials (e.g., Frequently Asked Questions, How-Tos, help desk, user forum) are also available across the GPM, PPS, and GES DISC webpages.<\/p>\n<p>Along with the other DAACs, GES DISC is facilitating data access and use by migrating its products and services to <a href=\"https:\/\/www.earthdata.nasa.gov\/eosdis\/cloud-evolution\" rel=\"noopener\">NASA\u2019s Earthdata cloud.<\/a> Once the migration is finished, users will be able to access all NASA\u2019s Earth data products from the 12 DAACs in one place, which can simplify interdisciplinary science studies. Over 50% of the archived GES DISC products have been migrated to the cloud as of this writing. Users can either access them directly in the NASA Earthdata cloud environment or download data in their own computing environment.\u00a0<\/p>\n<p>To broaden the GPM user community \u2013 especially for users who are either non-technical or not familiar with NASA data \u2013 GES DISC has developed an online interactive tool called <a href=\"https:\/\/giovanni.gsfc.nasa.gov\/giovanni\/\" rel=\"noopener\">Giovanni<\/a>, for viewing, analyzing, and downloading multiple Earth science datasets (including GPM) from within a web browser, allowing users to circumvent downloading data and software. At present, GPM L3 precipitation products (IMERG) along with over 2000 interdisciplinary variables from other NASA missions or projects are available in Giovanni. Over 20 plot types are included in Giovanni to facilitate data exploration, product comparison, and research. Links to results and data can be shared with colleagues. Data in different formats (e.g., NetCDF, comma separated values, or CSV) can be downloaded as well. A <a href=\"https:\/\/disc.gsfc.nasa.gov\/information\/glossary?title=Giovanni%20Publications%202004-2017\" rel=\"noopener\">list of referral papers utilizing Giovanni<\/a> is available.\u00a0<\/p>\n<p>Data services continue to evolve to meet increasing user requirements, such as the <a href=\"https:\/\/force11.org\/info\/guiding-principles-for-findable-accessible-interoperable-and-re-usable-data-publishing-version-b1-0\/\" rel=\"noopener\">Findable, Accessible, Interoperable, and Reusable<\/a> (FAIR) guiding principles, open science, data integration, interdisciplinary science, and data democratization.<\/p>\n<p><strong>Science and Societal Application Highlights from 10 Years of Observing Precipitation with GPM<\/strong><\/p>\n<p>As scientists and stakeholder organizations have made use of GPM datasets for analysis and research over the past decade, myriad scientific discoveries have been made leading to the emergence of a wide variety of real-time and retrospective societal applications for GPM data. These GPM user communities continue to dig into scientific questions and provide time-critical decision support to the public. This portion of the article highlights several of the scientific and application achievements made possible since the mission launched in 2014. This list is not intended to be exhaustive, but rather demonstrates GPM\u2019s unique accomplishments and what the mission offers for science and society.<\/p>\n<p><em>Capturing Microphysical Properties and Vertical Structure Information of Precipitating Systems<\/em><\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"2048\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?w=960\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 2\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=141,300 141w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=768,1638 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=480,1024 480w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=720,1536 720w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=960,2048 960w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=188,400 188w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=281,600 281w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=422,900 422w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=563,1200 563w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-2.png?resize=938,2000 938w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 2.<\/strong> Seasonal average cloud latent heating at a height of 6 km (~4 mi) derived from GSFC\u2019s Goddard Convective\u2013Stratiform (Latent) Heating Algorithm (CSH) algorithm for the period December 2020\u2013November 2023. Heating arises from cloud and precipitation processes making its spatial distribution highly correlated with precipitation. CSH shows deep, intense cloud heating in the tropics within the Inter Tropical Convergence Zone (ITCZ), west Pacific Ocean, and tropical land masses. Broad areas of heating at higher latitudes are associated with midlatitude storm tracks. Seasonal shifts in heating are most prominent over land.<\/div>\n<div class=\"hds-credits\"><strong>Image credit<\/strong>: Steven Lang \/GSFC\/Science Systems and Applications, Inc. (SSAI)<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>One of GPM\u2019s main charges was to provide microphysical properties and vertical structure information of precipitating systems using <a href=\"https:\/\/www.earthdata.nasa.gov\/sensors#:~:text=There%20are%20two%20types%20of,or%20reflected%20from%20the%20environment.\" rel=\"noopener\">passive and active remote sensing techniques<\/a>. Measurements of the vertical structure of clouds are fundamentally important to improving our understanding of how they affect both local- and large-scale environments. Achieving this goal has required considerable enhancement of the NASA GPM algorithms \u2013 including the DPR, GPROF, Combined (CMB), and <a href=\"https:\/\/gpm.nasa.gov\/resources\/documents\/goddard-convective-stratiform-heating-csh-algorithm\" rel=\"noopener\">Convective\u2013Stratiform (Latent) Heating (<\/a>CSH) algorithms \u2013 from their original capabilities at the time of launch.<\/p>\n<p>The advanced instrumentation of GPM\u2019s dual-frequency, K<sub>u<\/sub>\/K<sub>a<\/sub>-band radar added new capabilities beyond the TRMM PR\u2019s single K<sub>u<\/sub> band. As a result, the DPR algorithms provide vertical hydrometeor profiles at the radar range bin level [~5 km (~3 mi) horizontal, 125 m (~410 ft) vertical]. Such detailed measurements are critical for classifying precipitation events (e.g., convective or stratiform) and characterizing the dominant types of precipitation particles, precipitation characteristics, and freezing level height. Additionally, these DPR algorithms have played a significant role in retrieving parameters of the particle size distribution (PSD) in rain. All of these factors help support and elucidate the understanding of storm systems and their impacts at local and regional scales.<\/p>\n<p>More recently falling snow microphysics have received increasing attention.  Characterizing snow remains a challenging problem for precipitation measuring\/modeling due to varying particle habits, shapes, and snow mass densities. The higher frequencies added on both the DPR and GMI instruments have enabled improved observations of ice and snow, not only revealing new insights into the intensity and microphysical composition of cold-season precipitation but enabling an increased understanding of precipitation, clouds, and <a href=\"https:\/\/climate.nasa.gov\/nasa_science\/science\/\" rel=\"noopener\">climate feedbacks<\/a>. <\/p>\n<p>Another important parameter that is derived from GPM vertical profile information is <em>latent heating<\/em> (LH), which is so named because it measures the \u201chidden\u201d energy when water changes phase but doesn\u2019t impact its temperature. The vertical structure of LH is a key parameter for understanding the coupling of the Earth\u2019s water and energy cycles. Although it cannot be directly observed, GPM-derived precipitation estimates, microphysical properties, and vertical structure provide critical information for inferring the vertical structure of LH \u2013  see <strong>Figure 2<\/strong>. Researchers can access this information using the <a href=\"https:\/\/gpm.nasa.gov\/resources\/documents\/goddard-convective-stratiform-heating-csh-algorithm\" rel=\"noopener\">U.S. Science Team\u2019s CSH datasets<\/a> as well as the <a href=\"https:\/\/www.eorc.jaxa.jp\/GPM\/doc\/algorithm\/GPM_SLH_V06B_ATBD_20200706_fin.pdf\" rel=\"noopener\">Japanese Science Team\u2019s Spectral Latent Heating (LSH) datasets<\/a>. GPM\u2019s sampling of higher latitudes \u2013  not available from TRMM \u00ad\u2013  has resulted in estimates of the intensity and variability of 3D LH structures of precipitation systems beyond the tropics. The CSH algorithm has advanced during the GPM era due to improvements in numerical cloud models and higher accuracy vertical precipitation structure profiles.<\/p>\n<p><em>Improve knowledge of Precipitation Systems, Water Cycle Variability, and Freshwater Availability<\/em><\/p>\n<p>A key success of GPM \u2013 <strong> <\/strong>both from information from the GPM\u2013CO and from combining with the information from the constellation satellites \u2013 is the expansion of knowledge of precipitation systems both in the tropics and at middle and high latitudes. In addition, the program contributes to water availability and variations in time and space. The radar and PMW instruments on the GPM\u2013CO lead to the most accurate surface precipitation rate estimates and vertical structure of the systems, allowing researchers to study key features of these systems on an instantaneous basis and then compile precipitation statistics over time for accurate climatological determinations. The inclined orbit of the GPM\u2013CO results in sampling the entire <em>diurnal<\/em> (day\u2013night) cycle of precipitation, which is key information for validating numerical models. By combining the \u201cbest estimate\u201d data from the GPM\u2013CO with more frequent precipitation estimates from GPM constellation satellites results in the IMERG analyses (30-min resolution), which has allowed for the examination of fine-scale variations in all types of systems, the application of the IMERG NRT analyses for monitoring precipitation systems, and the use in a multitude of applications\u00a0 (e.g., hydrology, agriculture, and health) that depend on fresh water availability information.<\/p>\n<p>In the tropics, the GPM\u2013CO data have been combined with similar data from TRMM for a 25-year total observational record to study the rainfall structure and variations of tropical cyclones, the Intertropical Convergence Zone (ITCZ), and the mean rainfall climate of the tropics. Tropical mesoscale systems have been tracked with the 30-minute IMERG data to understand their life cycles and contributions to climatological rainfall. Tropical cyclone precipitation has been analyzed to understand storm initiation and variations with time over various ocean basins. Hailstorms have been studied with specifically developed hail algorithms over various continents, with particular focus on the extremely intense storms over South America.<\/p>\n<p>In midlatitudes, the structure of large-scale cyclonic systems, including atmospheric rivers (ARs), have been examined, as well as their relation to moisture source regions and impact in driving heavy precipitation events. At higher latitudes, GPM\u2019s focus on better precipitation retrievals \u2013  especially related to snow detection and estimation \u2013  has led to improved knowledge of storm systems in this important, changing environment.<\/p>\n<p> Looking across the globe, extreme precipitation events \u2013 often with accompanying flood and landslide events \u2013 have also been examined and cataloged, both on a local and regional basis, but with increasing ability on a quasi-global basis as the time record extends forward. <\/p>\n<p>On longer timescales, the GPM\u2013CO (and TRMM) data have contributed to our knowledge and estimates of mean climatological precipitation providing different estimates (from different products) for intercomparison and through \u201cbest estimate\u201d ocean climatological values using combined radar data and passive microwave information from GPM, TRMM, and <a href=\"https:\/\/www.jpl.nasa.gov\/missions\/cloudsat\" rel=\"noopener\">CloudSat<\/a>. This best estimate is used to calibrate a new, long-term <a href=\"https:\/\/catalog.data.gov\/dataset\/global-precipitation-climatology-project-gpcp-climate-data-record-cdr-version-1-3-daily2\" rel=\"noopener\">Global Precipitation Climatology Project<\/a> (GPCP) monthly analysis (1983\u2013present), which has resulted in a refined estimate of the mean ocean climatological value, that fits global water and energy budget studies better \u2013 see <strong>Figure 3<\/strong>. The GPM IMERG analyses are also now used as a key input to the GPCP global daily analyses, enabling finer-resolution climatological studies.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"706\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 3\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=300,147 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=768,377 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=1024,502 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=400,196 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=600,294 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=900,441 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-3.png?resize=1200,588 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 3<\/strong>. Example of Global Precipitation Climatology Project (GPCP) Daily Climate Data Record (CDR) for January 28, 2018. GPCP incorporates GPM\u2013CO and IMERG information to produce maps like the one shown here. <\/div>\n<div class=\"hds-credits\"><strong>Image credit: <\/strong>Bob Adler\/University of Maryland, College Park, Earth System Science Interdisciplinary Center (ESSIC)]<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p><em>GPM Precipitation Estimates Improving Climate Models and Constraining Predictions<\/em><\/p>\n<p>The multifaceted, multiscale physical processes that affect precipitation locally and globally continue to be a challenge for climate models to accurately represent. Ongoing research and analysis reveals that the process-level representation is a much stronger constraint on climate model prediction fidelity than mean state climatological skill. Though high-quality climate models, such as the <a href=\"https:\/\/www.wcrp-climate.org\/wgcm-cmip\" rel=\"noopener\">Coupled Model Intercomparison Project<\/a> (CMIP), are currently not run at the resolution of GPM observations, they are increasingly simulating cloud and thunderstorm-scale rainfall as subcomponents within their lower-resolution grid boxes. This allows for the model-simulated rain intensity over thunderstorm areas to be compared with GPM precipitation estimates that are averaged over the equivalent GPM DPR-identified convective cloud types. This evaluation inevitably involves assessing extremes, and with 10 years and counting of GPM data now avaiable, such extremes in different weather regimes will be increasingly useful to study \u2013 see <strong>Figure 4<\/strong>.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"1835\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 4\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=235,300 235w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=768,979 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=804,1024 804w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=1205,1536 1205w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=314,400 314w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=471,600 471w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=706,900 706w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-4.png?resize=942,1200 942w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 4. <\/strong>Average rainfall patterns from 2014\u20132020 in January using the NASA Goddard Institute for Space Studies\u2019 (GISS) \u2013 E3 climate model [<em>top<\/em>] and precipitation estimates derived from GPM\u2019s multisatellite product, IMERG [<em>bottom<\/em>]. Climate models such as the GISS-E3 must accurately simulate seasonal cycles observed by GPM for their predictions to be more reliable. Using the GPM rainfall magnitudes as benchmarks, new model equations are being developed to improve this area of rainfall simulation and improve climate projections.<\/div>\n<div class=\"hds-credits\"><strong> Image credit<\/strong>: Greg Elsaesser\/GISS<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p> Additionally, the diurnal cycle of precipitation \u2013 another challenge for climate models to simulate \u2013 remains an important focus. Recent studies have suggested that the systematic differences in cloud occurrence across the diurnal cycle are crucially important for atmospheric water vapor changes as well as cloud feedbacks and their role in climate change. This expanded understanding provides even more motivation for improving diurnal cycle representation in models. With the long GPM record, diurnal precipitation composites can be made in varying weather or climate states (e.g., El Ni\u00f1o\/Southern Oscillation), and additional novel analyses of regime-dependent diurnal cycle composites will be important for constraining processes.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"975\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 5\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=300,203 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=768,520 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=1024,693 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=400,271 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=600,406 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=900,609 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-5.png?resize=1200,813 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 5. <\/strong>Schematic of GPM observed latent heating in convective cores (i.e., thunderstorms) relative to a larger thunderstorm complex (i.e., mesoscale convective system).<\/div>\n<div class=\"hds-credits\"> <strong>Image credit<\/strong>: Greg Elsaesser; model is from a May 2022 paper published in Journal of Geophysical Research: Atmospheres<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>Availability of and improvements in GPM estimated stratiform rainfall will progressively enable addressing the longstanding deficiencies in simulating mesoscale convective systems \u2013 see <strong>Figure 5<\/strong>. Alongside use of \u201cprocess-relevant\u201d precipitation diagnostics, new efforts seek to use machine learning techniques to ensure that numerous climatological water and energy cycle diagnostics remain in good agreement with GPM and other satellite estimates. These joint efforts that leverage both mean-state global precipitation estimates plus the process-oriented precipitation diagnostics will ensure that coarser-resolution climate models that support numerous CMIP experiments will increase in predictive capability.<\/p>\n<p><strong>GPM Applications: Continuing to Grow and Enable Communities Across Local and Global Scales<\/strong><\/p>\n<p>As noted above, one GPM focus is the application of satellite precipitation estimates for societal decision-making. As a result, <a href=\"https:\/\/gpm.nasa.gov\/applications\" rel=\"noopener\">GPM data have supported applications<\/a> such as weather forecasting, water resource management, agriculture and food security monitoring, public health, animal migration, tropical cyclone location and intensity estimation, hydropower management, flood and landslide monitoring and forecasting, and land system modeling \u2013 see <strong>Figure 6<\/strong>.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"759\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 6\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=300,158 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=768,405 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=1024,540 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=400,211 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=600,316 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=900,474 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-6.png?resize=1200,633 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 6. <\/strong>GPM Applications icon highlights six thematic and primary societal application areas supported by GPM data: ecological management, water resources and agriculture, energy, disasters monitoring and response, public health, and weather and climate modeling.<\/div>\n<div class=\"hds-credits\"><strong>Image credit<\/strong>: GPM website; Mike Marosy\/GSFC\/Global Science and Technology Inc. (GST)<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>To support this focus, the GPM Applications team strives to focus on engaging users through trainings and interviews, workshops, webinars, and programs, with the objective of guiding new and existing users to integrate GPM data into their systems and processes to drive actions that positively impact society. These activities help elucidate data needs and identify data barriers faced by stakeholders. The team also helps identify opportunities and gaps to create effective engagement and outreach resources and help facilitate the use of GPM data to support decision making and improve situational awareness across different sectors. All of these efforts have helped increase the visibility of GPM and attract new users from federal and state partners, academic institutions, international agencies and non-governmental organizations (NGOs), and private and non-profit companies. A few examples of GPM Application engagement activities since launch include:<\/p>\n<ul>\n<li>three <a href=\"https:\/\/gpm.nasa.gov\/applications\/whos-using-gpm-data\" rel=\"noopener\">GPM Mentorship Programs<\/a> that bridge the gap between GPM scientists and application communities to promote operational applications;<\/li>\n<li>seventeen <a href=\"https:\/\/gpm.nasa.gov\/data\/training\" rel=\"noopener\">GPM trainings<\/a> to support new and existing users on data access and use for applications;<\/li>\n<li>six <a href=\"https:\/\/gpm.nasa.gov\/science\/meetings\" rel=\"noopener\">GPM stakeholder-driven application workshops<\/a> to facilitate discussions between scientists and end users of GPM data about how NASA data could be better leveraged to inform decision making for societal applications; and<\/li>\n<li>three white papers that articulate and identify user needs and data requirements across communities.<\/li>\n<\/ul>\n<p>The GPM Applications team has tabulated over 10,000+ unique users across 130 countries who have accessed or routinely access GPM data from NASA data archives. Additionally, the value of these activities can be seen in over 175 GPM case study application examples that have been publicized at NASA, featured on social media and posted at NASA <a href=\"https:\/\/gpm.nasa.gov\/applications\" rel=\"noopener\">GPM Applications<\/a> webpage, over the last 5 years alone \u2013 see sampling of applications in <strong>Figure 7<\/strong>.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"1626\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Figure 7\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=266,300 266w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=768,867 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=907,1024 907w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=1360,1536 1360w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=354,400 354w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=531,600 531w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=797,900 797w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-figure-7.png?resize=1063,1200 1063w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Figure 7<\/strong>. Collage of GPM case study examples enabling societal applications, including weather forecasting, nowcasting of extremes, agricultural and drought monitoring, weather index insurance, and data management platforms.<\/div>\n<div class=\"hds-credits\"><strong>Image credit<\/strong>: Andrea Portier \/GSFC\/ SSAI<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>Over the past decade of GPM observations, several themes have emerged with these efforts across the applications community. One key component of enabling GPM applications is the ability to access and download NRT data products that meet applications needs. About 40% of GPM end users rely on NRT GPM products for time-sensitive applications. Additionally, GPM\u2019s global-gridded IMERG product plays a significant role for applications. It is used nearly 17 times more for research and applications compared to other GPM products, with ~30% of users accessing and downloading IMERG Early and Late NRT data and applying them towards operational uses. As noted earlier, the reprocessing of all TRMM precipitation-era data using the IMERG algorithm ensured a longer, continuous precipitation data record with consistent retrievals that are available from June 2000 to the present. The longer precipitation record has enabled new science research and data applications to benefit society across a diverse range of end-users, helping them to compare and contrast past and present data to support and develop more accurate climate and weather models, understand normal and anomalous extreme precipitation events, and strengthen the baseline information and situational awareness for applications, such as disasters, agriculture and food security, water resources, and energy production. <strong>Table 2<\/strong> presents several broader examples of how these GPM data products are used for societal applications. The subsections that follow demonstrate the value of GPM data to facilitate research and applications even more through case studies.<\/p>\n<p><strong>Table 2.<\/strong><em> <\/em>The table includes examples of user communities, by organizational sectors, that highlight how GPM data products are being used for situational awareness and decision-making. Application description includes type of GPM level products. For more information on level product definitions, see <a href=\"https:\/\/www.earthdata.nasa.gov\/engage\/open-data-services-and-software\/data-information-policy\/data-levels#:~:text=NASA's%20Earth%20Observing%20System%20Data,more%20useful%20parameters%20and%20formats\" rel=\"noopener\">NASA Data Product Levels<\/a> and <a href=\"https:\/\/gpm.nasa.gov\/data\/directory\" rel=\"noopener\">GPM Data Directory<\/a>.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>User Community<\/strong><strong><\/strong><\/td>\n<td><strong>Topic<\/strong><strong><\/strong><\/td>\n<td><strong>Application of GPM Data<\/strong><strong><\/strong><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\">Meteorological agencies and organizations<\/td>\n<td>Numerical weather prediction<\/td>\n<td>Assimilation of Level 1 (L1) PMW T<sub>B<\/sub>s for initializing numerical weather prediction model runs to improve weather forecasts<\/td>\n<\/tr>\n<tr>\n<td>Tropical cyclones<\/td>\n<td>Improved characterization of tropical cyclone track and intensity using GPM L1 and L2 products to improve weather forecasts and provide more accurate hurricane warnings<\/td>\n<\/tr>\n<tr>\n<td>Subseasonal to seasonal and climate modeling<\/td>\n<td>Verification and validation of seasonal and climate modeling using L2 LH products and IMERG (Final) to improve understanding and predictability of climate behavior<\/td>\n<\/tr>\n<tr>\n<td>Data-driven agriculture organizations<\/td>\n<td>Agricultural forecasting and food security<\/td>\n<td>Integration of IMERG (Early, Late) precipitation estimates within agricultural models to estimate growing season onset and crop productivity<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\">Disaster risk management organizations<\/td>\n<td>Flooding<\/td>\n<td>Incorporation of IMERG (Early, Late) in hydrologic routing models for flood estimation<\/td>\n<\/tr>\n<tr>\n<td>Disaster response and recovery<\/td>\n<td>Situational awareness of extreme precipitation using IMERG (Early, Late) in potentially affected areas to support disaster response and recovery efforts<\/td>\n<\/tr>\n<tr>\n<td>Disaster risk management platforms<\/td>\n<td>Integration of IMERG (Early, Late, Final) into models to deliver real-time weather insights to customers<\/td>\n<\/tr>\n<tr>\n<td>Energy infrastructure and management organizations<\/td>\n<td>Renewable energy infrastructure and management<\/td>\n<td>Assessment of freshwater inputs and quantification of water fluxes using IMERG (Early, Late, Final) as a precipitation data source for hydropower development, production, and flow forecasting<\/td>\n<\/tr>\n<tr>\n<td>Reinsurance companies<\/td>\n<td>Parametric insurance and reinsurance modeling<\/td>\n<td>Definition of extreme precipitation thresholds using IMERG (Early, Late, Final) for developing multiperil index-based insurance products and improve situational awareness of rainfall to trigger policy payouts<\/td>\n<\/tr>\n<tr>\n<td>Water resource management organizations and companies<\/td>\n<td>Water resources and drought<\/td>\n<td>Evaluation of precipitation anomalies using IMERG (Final) leveraging the extended temporal record, and assessment of freshwater input using IMERG (Early, Late) to basins and reservoirs to better quantify water fluxes<\/td>\n<\/tr>\n<tr>\n<td>Public health<\/td>\n<td>Vector- and water-borne disease monitoring<\/td>\n<td>Tracking of precipitation variations using IMERG (Early, Late, Final) with other environmental variables to track and predict vector or water-borne diseases and issue public health alerts<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p><em>Operational Numerical Weather and Hurricane Prediction<\/em><\/p>\n<p>Looking towards the application of GPM L3 products, several agencies [e.g., the U.S. Air Force\u2019s (USAF) Weather Agency (557<sup>th<\/sup> Weather Wing), Environment and Climate Change Canada (ECCC), and the Australian Bureau of Meteorology] use IMERG to support reanalysis of NWP models to conduct data assimilation and validation activities and as inputs to numerical models. For example, the <a href=\"https:\/\/www.nasa.gov\/missions\/gpm\/nasa-satellite-precipitation-data-joins-the-air-force\/\">USAF ingests IMERG Early into its operational weather forecasts<\/a> and advisories, supporting global land surface characterization capabilities. This information is then provided routinely to decision-makers across the military, agricultural, and research sectors.<\/p>\n<p><em>Water Resources, Agricultural Forecasting and Food Security<\/em><\/p>\n<p>GMI L1 T<sub>B<\/sub> products are operationally assimilated into numerical weather prediction (NWP) models across the globe to improve short- to long-term weather forecast quality (by tuning and developing microphysics and convection parameterizations) and correct the track forecasts for tropical cyclones. Agencies and organizations, such as NASA\u2019s Global Modeling Assimilation Office (GMAO), the National Oceanic and Atmospheric Administration\u2019s (NOAA) National Hurricane Center (NHC), Naval Research Laboratory (NRL), and European Centre for Medium-Range Weather Forecasts (ECMWF) ingest GMI T<sub>B<\/sub> data to support their operational systems. For example, the all-sky assimilation of GMI T<sub>b<\/sub> over ice-free ocean surfaces helps improve initial conditions and overall forecast quality to ECMWF\u2019s 24-hour forecasts, increasing not only the number of satellite observations assimilated but also the types of variables analyzed, such as hydrometeors (e.g., liquid cloud, ice cloud, rain, and snow).<\/p>\n<p>GPM\u2019s L2 precipitation and L3 IMERG products are used as input into hydrological and land surface models to better understand the land\u2013atmosphere interactions and better predict and monitor water resources and agricultural output on scales ranging from days to years. For example, IMERG serves as a key component to <a href=\"https:\/\/ldas.gsfc.nasa.gov\/fldas\" rel=\"noopener\">Famine Early Warning Systems Network (FEWS NET) Land Data Assimilation System<\/a> hydrology products that are designed to enhance agricultural monitoring in data-sparse regions and support humanitarian response initiatives. IMERG Early products are actively used as a data source for the U.S. Department of Agriculture\u2019s Foreign Agricultural Service operations where IMERG estimates are routinely evaluated against World Meteorological Organization station data above 50\u02daN latitude for consensus to produce crop assessments in those regions and support extratropical agrometeorological crop monitoring. In the private sector, companies, such as <a href=\"https:\/\/nutrienagsolutions.com\/\" rel=\"noopener\">Nutrien Ag Solutions<\/a>, use IMERG Early precipitation estimates to capture and evaluate extreme precipitation events. This information is part of Nutrien\u2019s daily delivery of weather content to the company and their clients, where these efforts help the clients prepare for potential disruptions across the global supply chain.<\/p>\n<p><em>Disaster Response and Insurance<\/em><\/p>\n<p>The IMERG spatial and temporal resolution \u2013 as well as the availability of the data across more than two decades \u2013  has been invaluable for examining precipitation extremes that may result in flooding, landslides, drought, and fires. These data provide key situational awareness for disaster response and recovery. Rainfall information has been developed in Web Map Service (WMS) and ArcGIS formats with <a href=\"https:\/\/en.wikipedia.org\/wiki\/REST\" rel=\"noopener\">Representational State Transfer<\/a> (REST) endpoints so that they can be pulled into geospatial portals at Federal Emergency Management Agency (FEMA), the U.S. Army Geospatial Intelligence Unit and data management platform companies (e.g., CyStellar), and provided to the National Geospatial Agency, the State Department, and insurers. The IMERG product has also been critical to global disaster models, such as the near-global <a href=\"https:\/\/gpm.nasa.gov\/landslides\/projects.html\" rel=\"noopener\">Landslide Hazard Assessment for Situational Awareness<\/a> (LHASA) system, which uses NRT IMERG rainfall in a decision tree framework that issues a moderate or high landslide nowcast based on rainfall thresholds. The <a href=\"https:\/\/landslides.nasa.gov\/\" rel=\"noopener\">model is routinely updated<\/a> with a latency of four hours. The LHASA versions are running routinely and used by U.S. agencies and international agencies and organizations, including the World Food Programme.<\/p>\n<p>IMERG data are also being used at multiple reinsurance companies, including the <a href=\"https:\/\/www.microrisk.org\/\" rel=\"noopener\">Microinsurance Catastrophe Risk Organisation<\/a> (MiCRO), to develop drought and rainfall indices using climatology data from IMERG.<\/p>\n<p><em>Looking Across and Forward for Applications<\/em><\/p>\n<p>Common themes that have emerged in stakeholder feedback include the need for continuity of data products, identifying uncertainty estimates, having easily accessible case study examples, and creating public trainings for data access and use. The Applications team works closely with GPM members and leadership to ensure that there are clear and open communication pathways across the GPM mission on engagement activities and to accelerate stakeholder feedback to GPM algorithm developers to aid in the improvement of GPM data products and services for the public. In addition, these insights can be used to formulate a framework for applications related to future mission planning, e.g., NASA\u2019s Earth System Observatory missions.<\/p>\n<p><strong>Bridging the Gap Between Precipitation Measurements and the Public: A View into Outreach Efforts<\/strong><\/p>\n<p>Several years before the launch of GPM, the Education and Public Outreach (EPO) team was busy in the background, working to bring Science, Technology, Engineering, and Mathematics (STEM) into the classroom and taking advantage of the <a href=\"https:\/\/www.nextgenscience.org\/\" rel=\"noopener\">Next Generation Science Standards<\/a> (NGSS) that were being implemented in curriculums across the U.S. The launch of GPM offered a perfect opportunity to showcase and amplify the incredible science and technology behind the GPM mission and the myriad of potential applications that could stem from its data.<\/p>\n<p>Early in the GPM mission\u2019s development, the GPM EPO team curated existing NASA educational resources related to the themes of Earth\u2019s water cycle, weather and climate, technology behind Earth Observing missions, and societal applications. The EPO team created a website, entitled <a href=\"https:\/\/gpm.nasa.gov\/education\/\" rel=\"noopener\">Precipitation Education<\/a> that has been wildly successful from its launch. The team also developed a <a href=\"https:\/\/gpm.nasa.gov\/education\/sites\/default\/files\/article_images\/Rain%20EnGAUGE%20Toolkit.pdf\" rel=\"noopener\">Rain EnGAUGE toolkit<\/a> and engaged both formal and informal educators from around the world to host \u201cFamily Science Night\u201d programs and implement some of the interactive activities that the team developed for these events. Thus, even before the launch of GPM, the EPO effort had momentum as team members shared the incredible ways in which NASA\u2019s Earth observation systems were helping us to better understand and protect our home planet.<\/p>\n<p>After launch, the EPO Team worked annually with international teams of \u201cGPM Master Teachers.\u201d This process selected teachers, who participated throughout the school year and received a small stipend for their work. They helped to align the science behind the GPM mission and other NASA Earth observation systems with the <a href=\"https:\/\/www.globe.gov\/\" rel=\"noopener\">Global Learning and Observations to Benefit the Environment<\/a> (GLOBE) program and developed many lessons and activities that were made available to educators around the globe.<\/p>\n<p>The EPO team also worked with NASA\u2019s <a href=\"https:\/\/earthtosky.org\/\" rel=\"noopener\">Earth to Sky<\/a> program, training National Park Service and other interpreters to understand the science behind the GPM mission, and to find ways to share this information in meaningful and relevant ways with their audiences across the U.S.<\/p>\n<p>Newer activities have been developed to enable the general public to interact with <em>open science <\/em>as they follow a very easy \u201cdata recipe\u201d to retrieve GPM precipitation observations since 2000 for their location. They are encouraged to use the GLOBE program\u2019s app, <a href=\"https:\/\/observer.globe.gov\/\" rel=\"noopener\">GLOBE Observer<\/a>, and take an observation of either a tree height or clouds. Contributors input the latitude and longitude from that location and find out how much precipitation fell for that location since 2000. This gives the participants the opportunity to collect data from the ground, and then look at satellite data for that same location to better understand the impact of precipitation in their local environment. GLOBE Participants can share their <a href=\"https:\/\/gpm.nasa.gov\/education\/sites\/default\/files\/document_files\/Telling%20Tree%20Story%20one-pager.FINAL.pdf\" rel=\"noopener\">Tree Stories<\/a> and <a href=\"https:\/\/gpm.nasa.gov\/education\/sites\/default\/files\/document_files\/Telling%20Water%20Story%20one-pager_FINAL.pdf\" rel=\"noopener\">Water Stories<\/a> and compare their data with others around the world.<\/p>\n<p>In addition to providing a wide suite of online resources, the GPM Outreach team attends many public events each year, ranging from large NASA-sponsored Earth Day events to local family STEM nights \u2013 see <strong>Photos 2<\/strong> <strong>and 3<\/strong>. The GPM Outreach team has developed many hands-on activities that help the public explore the varied amounts of precipitation falling in locations around the world. By interacting with these activities and learning how NASA is helping us better understand and protect our home planet, participants walk away with a richer understanding of how NASA\u2019s Earth science programs are improving life around the world.<\/p>\n<p>A decade after the launch of GPM, the \u201cPrecipitation Education\u201d website continues to be incredibly popular, with an average of 90,000 visits per month. GPM education and outreach resources are considered the state of the art among practitioners, and the team updates existing and adds new resources as opportunities arise.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"475\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Photo 2\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=300,99 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=768,253 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=1024,338 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=400,132 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=600,198 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=900,297 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-2.jpg?resize=1200,396 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Photo 2. <\/strong>Montgomery County\u2019s (Maryland) Georgian Forest Family Science, Technology, Engineering, and Math (STEM) Night. Shown here is a triptych of parents and children using \u201cPrecipitation Towers\u201d to explore precipitation patterns measured by GPM in different locations throughout the world.<\/div>\n<div class=\"hds-credits\"><strong>Photo credit<\/strong>: Dorian Janney\/GSFC\/ ADNET Systems Inc. (ADNET)<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"1080\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?w=1440\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"GPM Photo 3\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg 1440w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=300,225 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=768,576 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=1024,768 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=400,300 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=600,450 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=900,675 900w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/09\/gpm-photo-3.jpg?resize=1200,900 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\"><strong>Photo 3. <\/strong>The GPM Outreach Team engaging the public at Maryland Day 2023, hosted by the University of Maryland (UMD), College Park on Saturday, April 29, 2023. The Team represented GPM at the NASA exhibit where they interacted with hundreds of attendees and highlighted the many benefits of using GPM data for research and societal applications.<\/div>\n<div class=\"hds-credits\"><strong>Photo credit<\/strong>: Dorian Janney<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p><strong>Conclusion<\/strong><\/p>\n<p>In more than 10 years of operations, the GPM mission has made incredible contributions in our understanding of global precipitation, from scientific studies to real-world, societal impacts through applications of the data products. With a robust validation program and successive algorithm improvements, our knowledge of precipitation distribution across the globe continues to advance. This has had measurable effects on global modeling and weather forecasting, real-time severe weather monitoring, education, and many other areas. With hardware continuing to function \u2013 and a recent fuel-saving orbit boost \u2013 GPM continues to add to this valuable data record. The community\u2019s experience with GPM helps illustrate what new observations or combinations of observations will be needed in coming decades to advance precipitation science and maintain needed global monitoring. GPM\u2019s cohort of researchers, instrument specialists, mission operators, and other key personnel across the community are providing the backbone of future mission development efforts.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1037\" height=\"24\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?w=1037\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Black Separator Line\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png 1037w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=300,7 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=768,18 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=1024,24 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=400,9 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=600,14 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=900,21 900w\" sizes=\"auto, (max-width: 1037px) 100vw, 1037px\"><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>Acknowledgements<\/strong><\/p>\n<p>The authors wish to acknowledge several contributing members of the Global Precipitation Measurement Science Team who played a part in writing this anniversary article. They include: <strong>Gerald Heymsfield<\/strong>, <strong>Dorian Janney<\/strong>, <strong>Chris Kidd<\/strong>,\u00a0 <strong>Steven Lang<\/strong>, <strong>Zhong Liu<\/strong>, <strong>Adrian Loftus<\/strong>, <strong>Erich Stocker<\/strong>, and <strong>Jackson Tan <\/strong>[all at GSFC]; <strong>David Wolff<\/strong> [NASA\u2019s Wallops Flight Facility (WFF)]; <strong>Gregory Elsaesser<\/strong> [NASA Goddard Institute for Space Studies (GISS)\/ Columbia University]; and <strong>Robert Adler<\/strong> [University of Maryland].<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1037\" height=\"24\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?w=1037\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Black Separator Line\" block_context=\"nasa-block\" srcset=\"https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png 1037w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=300,7 300w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=768,18 768w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=1024,24 1024w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=400,9 400w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=600,14 600w, https:\/\/smd-cms.nasa.gov\/wp-content\/uploads\/2024\/05\/eo-blackseparator-line.png?resize=900,21 900w\" sizes=\"auto, (max-width: 1037px) 100vw, 1037px\"><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<p><strong><em>Andrea Portier<br \/>NASA\u2019s Goddard Space Flight Center\/Science Systems and Applications, Inc<br \/>andrea.m.portier@nasa.gov \u00a0<\/em><\/strong><\/p>\n<p><strong><em>Sarah Ringerud<br \/>NASA\u2019s Goddard Space Flight Center<br \/>sarah.e.ringerud@nasa.gov<\/em><\/strong><\/p>\n<p><strong><em>George J. Huffman<br \/>NASA\u2019s Goddard Space Flight Center<br \/>george.j.huffman@nasa.gov<\/em><\/strong><\/p>\n<div class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 nasa_template_article_a hds-module hds-module-full wp-block-nasa-blocks-credits-and-details\">\n<section class=\"padding-x-0 padding-top-5 padding-bottom-2 desktop:padding-top-7 desktop:padding-bottom-9\">\n<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n<div class=\"grid-col-12 desktop:grid-col-2 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n<div class=\"margin-bottom-2\">\n<h2 class=\"heading-14\">Share<\/h2>\n<\/div>\n<div class=\"padding-bottom-2\">\n<ul class=\"social-icons social-icons-round\">\n<li class=\"social-icon social-icon-x\">\n\t\t\t\t\t\t\t<a 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class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n<div class=\"margin-bottom-2\">\n<h2 class=\"heading-14\">Details<\/h2>\n<\/div>\n<div class=\"grid-row margin-bottom-3\">\n<div class=\"grid-col-4\">\n<div class=\"subheading\">Last Updated<\/div>\n<\/div>\n<div class=\"grid-col-8\">Oct 03, 2024<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n<div class=\"padding-top-3 border-top-1px border-color-carbon-black \">\n<div class=\"margin-bottom-2\">\n<h2 class=\"heading-14\">Related Terms<\/h2>\n<\/div>\n<ul class=\"article-tags\">\n<li class=\"article-tag\"><a href=\"https:\/\/science.nasa.gov\/earth-science\/\" rel=\"noopener\">Earth Science<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<p class=\"wpematico_credit\"><small>Powered by <a href=\"http:\/\/www.wpematico.com\" target=\"_blank\" rel=\"noopener\">WPeMatico<\/a><\/small><\/p>\n<p><a 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