NASA’s Stennis Space Center Employees Receive NASA Honor Awards

NASA Stennis Space Center Director John Bailey and NASA Associate Administrator for Space Operations Kenneth Bowersox presented NASA Honor Awards to Stennis employees during an onsite ceremony May 15.

Prior to presenting NASA Honor Awards to Stennis employees, Bailey received the Meritorious Senior Executive Presidential Rank Award. The award from the President of the United States is one of the highest awards given to career Senior Executive Service employees.

Since joining NASA in 1999, Bailey has served in various management and leadership roles. He was named NASA Stennis center director in April. As director, Bailey is responsible for implementing NASA’s mission in rocket propulsion testing and developing and maintaining NASA’s world-class rocket propulsion test facilities. He has provided leadership and managed critical rocket propulsion test assets exceeding $2 billion in replacement value and managed projects over $221 million.

One NASA Stennis employee received NASA’s Outstanding Leadership Medal. The medal is awarded to government employees for notable leadership accomplishments that have significantly influenced the NASA mission.

NASA Honor Awards Recipients

Michael Tubbs of Diamondhead, Mississippi, received the NASA Outstanding Leadership Medal for his work as deputy director of the Office of Strategic Infrastructure within the Center Operations Directorate at NASA Stennis. The Yorktown, Virginia, native ushered in improvements and new initiatives that have helped achieve a cultural transformation and millions in cost-saving measures. His accomplishments also include leading the efforts to complete lease agreements between NASA and Rocket Lab of America for use of the A-3 Test Stand and between NASA and Relativity Space for use of the A-2 Test Stand.

Five NASA Stennis employees received NASA’s Exceptional Service Medal. The medal is awarded to government employees for sustained performance that embodies multiple contributions to NASA projects, programs, or initiatives.

David Lorance of Slidell, Louisiana, received the NASA Exceptional Service Medal for his efforts in furthering the NASA mission through leadership of the Environmental and Health Services Office Division in the Center Operations Directorate at NASA Stennis. Lorance has been responsible for ensuring compliance with numerous environmental programs, managing resources to ensure requirements are met with no impact to mission projects, managing hundreds of regulatory reports for submission on time, and ensuring environmental permits are maintained.

Brad Messer of Santa Rosa Beach, Florida, received the NASA Exceptional Service Medal for more than 32 years of service to NASA. Since joining NASA in 1991, Messer has contributed to a variety of propulsion test and engineering projects. As assistant director of the NASA Stennis Engineering and Test Directorate in charge of the Office of Project Management, Planning and Control, he has been responsible for the day-to-day business operations and project activities across the test complex. Messer has also made significant contributions to the strategic planning and execution of activities essential to the future state of the test complex.

Kevin Power of Mandeville, Louisiana, received the NASA Exceptional Service Medal for more than 34 years of service to NASA. As deputy assistant director for the Office of Project Management, Planning and Control in the Engineering and Test Directorate at NASA Stennis, the Port Sulphur, Louisiana, native has consistently delivered support to the NASA Stennis vision and mission. He has helped accomplish center, NASA, and national goals by providing management and engineering leadership, expertise, resources, and guidance to multiple NASA and commercial propulsion test projects, including some of the center’s most critical test infrastructure efforts.

Cecile Saltzman of Pass Christian, Mississippi, received the NASA Exceptional Service Medal for more than 20 years of service to the NASA Stennis Engineering and Test Directorate. Saltzman’s work has included management of the directorate document process control function, ensuring NASA Stennis test complex assets and support facilities are operated, utilized, and continually improved in providing premier testing services to NASA and commercial customers. The Thibodaux, Louisiana, native has consistently exceeded the agency’s timeline for editing fiscal year accomplishments of all NASA Stennis senior executive service and senior level personnel.

John Stealey of Diamondhead, Mississippi, received the NASA Exceptional Service Medal for more than 35 years of service to NASA, including 26 years at NASA Stennis. The Granville, Tennessee, native has contributed to a range of agency and center projects. Among his accomplishments, Stealey has assisted in overseeing strategic planning for NASA Stennis propulsion test facilities and workforce. He has served in various center roles, including as deputy of the Safety and Mission Assurance Directorate and assistant director of the Engineering and Test Directorate. He also served on the agency-level Exploration System Directorate Standing Review Board, providing expert advice on systems engineering and project management.

One NASA Stennis employee received NASA’s Exceptional Public Service Medal. The medal is awarded to non-government individuals or to an individual who was not a government employee during the period in which the service was performed for sustained performance that embodies multiple contributions on NASA projects, programs, or initiatives.

Rodney King of Picayune, Mississippi, received the NASA Exceptional Public Service Medal for efforts as the facility maintenance supervisor on the Synergy-Achieving Consolidated Operations and Maintenance contract at NASA Stennis. In that role, King has been responsible for electrical and high voltage work at the site. King’s service-centered approach has rendered him successful in technical work activities and how he relates to customers, management, peers, and direct reports. He has been recognized by organizations throughout the NASA Stennis federal city for his quick response to outages or calls within their facilities.

Four NASA Stennis employees received NASA’s Exceptional Bravery Medal. The medal is awarded to both government and non-government individuals for exemplary and courageous handling of an emergency by an individual who, independent of personal danger, has acted to prevent the loss of human life and/or government property.

Barry Hoda of Kiln, Mississippi, received the NASA Exceptional Bravery Medal for exemplary and courageous actions while responding to a medical emergency at NASA Stennis to prevent the loss of human life on Dec. 7, 2022. An officer with Chenega Global Protection, Hoda noted the employee was unresponsive, and no pulse or respiration were detected. Hoda immediately began cardiopulmonary resuscitation (CPR) and then synchronized CPR chest compressions with other respondents, ensuring a continuous, uninterrupted blood supply to the employee’s brain. The rapid response and coordinated effort were directly responsible for saving a life.

Leeanna Dunigan of Diamondhead, Mississippi, received the NASA Exceptional Bravery Medal for exemplary and courageous actions while responding to a medical emergency at NASA Stennis to prevent the loss of human life on Dec. 7, 2022. A captain with Chenega Global Protection, Dunigan helped provide cardiopulmonary resuscitation (CPR) to the employee in distress by synchronizing CPR chest compressions with other respondents, ensuring a continuous, uninterrupted blood supply to the employee’s brain. The rapid response and coordinated effort were directly responsible for saving a life.

Brenden Burns of Gulfport, Mississippi, received the NASA Exceptional Bravery Medal for exemplary and courageous actions while responding to a medical emergency at NASA Stennis to prevent the loss of human life on Dec. 7, 2022. An officer with Chenega Global Protection, Burns utilized an automated external defibrillator on an employee in distress. The rapid response and coordinated effort with others were directly responsible for saving a life.

Issac Delancey of Picayune, Mississippi, received the NASA Exceptional Bravery Medal for exemplary and courageous actions while responding to a medical emergency at NASA Stennis to prevent the loss of human life on Dec. 7, 2022. An officer with Chenega Global Protection, Delancey provided the automated external defibrillator while responding to an incident of an employee in distress. Upon arrival, Delancey provided the employee with artificial respiration and coordinated effort with others to maximize the effect of chest compressions. The rapid response and coordinated effort were directly responsible for saving a life.

One NASA Stennis employee received the NASA Exceptional Technology Achievement Medal. The medal is awarded to government or non-government individuals for exceptional technology contributions.

Richard Smith of Picayune, Mississippi, received NASA’s Exceptional Technology Achievement Medal for efforts that led to significant advances to the data acquisition and thrust vector control systems that provide critical support to propulsion testing onsite. Among his contributions, Smith, a contractor on the operations and maintenance contract at NASA Stennis, was the primary software system architect for the thrust vector control work to enable rocket engine gimbal testing. He also worked to ensure safe hydraulic operation of the system. His efforts enabled the NASA Stennis test team to perform successful certification testing of the new RS-25 production engine.

Four NASA Stennis employees received the NASA Exceptional Achievement Medal. The medal is awarded to any government employee for a significant specific achievement or substantial improvement in operations, efficiency, service, financial savings, science, or technology which contributes to the mission of NASA.

John Boffenmyer of Slidell, Louisiana, received NASA’s Exceptional Achievement Medal for maintaining the highest levels of performance in his remediation responsibilities within the NASA Stennis Center Operations Directorate, resulting in substantial benefits to the agency. As NASA Remediation Program manager for NASA Stennis, Boffenmyer’s work is integral to the Environmental and Health Services Office achieving the NASA Stennis and NASA missions. In conjunction with management of field operations, the Pottsville, Pennsylvania, native has demonstrated outstanding program management, with all audits of the NASA Stennis program proving successful.

Thomas Meredith of Slidell, Louisiana, received NASA’s Exceptional Achievement Medal for his efforts as deputy chief engineer at NASA Stennis. During his tenure, the Enterprise, Alabama native has made substantial improvements to the management of test facility hardware in support of the center’s rocket propulsion test operations. Meredith’s leadership and dedication in the management of rocket propulsion test hardware have contributed to two areas of agency emphasis, the sustainment and modernization of mission-critical facilities and the employment of digital technologies to change and improve a process, product, or capability.

Kris Mobbs of Woolmarket, Mississippi, received NASA’s Exceptional Achievement Medal for his efforts as software engineer in the NASA Stennis Engineering and Test Directorate to lead development of the NASA Data Acquisition Software suite for the acquisition, displaying, and recording of critical data during daily and test activities. Mobbs has led in identifying and implementing new capabilities of the software suite and in development of software packages to help increase the reliability of test data and performance of the test team. As a direct outcome of his leadership, use of the software has expanded to all the NASA Stennis-operated test facilities.

Ryan Seals of Carriere, Mississippi, received NASA’s Exceptional Achievement Medal for his contributions to the NASA Stennis propulsion test mission. Since beginning his career with NASA in 2016, the Poplarville, Mississippi, native has proven his expertise regarding test stand components and systems, contributing to the team responsible for testing the RS-25 engine that powers NASA’s SLS (Space Launch System) rocket. Seals also provided depth for the Thad Cochran Test Stand (B-2) team in preparation for hot fire testing of the SLS core stage. He also has supported commercial partner testing at the E Test Complex.

Four NASA Stennis employees received NASA’s Early Career Achievement Medal. The medal is awarded to government employees for unusual and significant performance during the first 10 years of an individual’s career in support of the agency.

Huy Nguyen of Slidell, Louisana, received the NASA Early Career Achievement Medal for his contributions as the facility controls engineer in the Electrical Test Operations Branch in the NASA Stennis Engineering and Test Directorate. In that role, Nguyen has supported the daily operations of the High Pressure Gas Facility and High Pressure Industrial Water Facility, which provide critical support to test complex propulsion activities. Among his contributions, Nguyen was instrumental to the success of upgrades, analysis, and practice runs to mitigate any risks during Green Run testing of the SLS (Space Launch System) core stage at NASA Stennis.

Kevin Oramous of Slidell, Louisiana, received the NASA Early Career Achievement Medal for his contributions to propulsion test activities and support facilities to directly advance NASA’s rocket propulsion test mission. The New Orleans native began his career at NASA Stennis in 2019 in the Mechanical Operations Branch of the NASA Stennis engineering and Test Directorate, working in the site’s E Test Complex and High Pressure Gas Facility, using his expertise to support operation and systems projects and activities. Oramous also has supported RS-25 testing, propellant and commodity management, and the Thad Cochran Test Stand (B-2) during the SLS (Space Launch System) core stage testing.

Jason Richard of Mandeville, Louisiana, received the NASA Early Career Achievement Medal for contributions to NASA’s support of commercial propulsion test partners at NASA Stennis. As project engineer at the E-1 Test Facility, Richard ensured completion of facility design, construction, and activation phases for the Relativity Space Aeon-R Thrust Chamber Assembly test project, while maintaining rigorous quality and safety standards. Working with the NASA Stennis Strategic Business Development Office, Richard has helped bridge the propulsion testing and business development teams and worked to implement the office’s information technology strategy.

Bradley Tyree of Picayune, Mississippi, received the NASA Early Career Achievement Medal for his work in the Mechanical Operations Branch in the NASA Stennis Engineering and Test Directorate. Tyree has provided leadership and technical expertise to key projects, including E Test Complex support of SLS (Space Launch System) core stage testing at NASA Stennis. Since being assigned to support RS-25 testing, his knowledge of propellant handling techniques, technical system maintenance, and test processes have proved invaluable and enabled his progression as a propellant transfer engineer and RS-25 test conductor.

One NASA Stennis employee received NASA’s Silver Achievement Medal. The medal is awarded to any government or non-government employee for a stellar achievement that supports one or more of NASA’s core values, when it is deemed to be extraordinarily important and appropriate to recognize such achievement in a timely and personalized manner.

Gregg De Felicibus of Pass Christian, Mississippi, received the NASA Silver Achievement Medal for displaying NASA’s core values of safety, integrity, teamwork, excellence, and inclusion while carrying out his work as a contracting officer in the Office of Procurement in support of advancing Space Exploration and NASA’s strategic goals. He has been responsible for the award and management of five critical services contracts valued at over $18.6 million. He has served as an advisor and mentor, has supported the NASA Stennis Small Business Office in achieving its socio-economic goals, has administered over $43 million in contracts, and has negotiated over $5.7 million in cost savings.

For information about NASA’s Stennis Space Center, visit:

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NASA’s Hubble Temporarily Pauses Science

NASA’s Hubble Space Telescope entered safe mode May 24 due to an ongoing gyroscope (gyro) issue, suspending science operations. Hubble’s instruments are stable, and the telescope is in good health.

The telescope automatically entered safe mode when one of its three gyroscopes gave faulty telemetry readings. Hubble’s gyros measure the telescope’s slew rates and are part of the system that determines and controls precisely the direction the telescope is pointed. NASA will provide more information early the first week of June.

NASA anticipates Hubble will continue making discoveries throughout this decade and possibly into the next, working with other observatories, such as the agency’s James Webb Space Telescope for the benefit of humanity.

Launched in 1990, Hubble has been observing the universe for more than three decades and recently celebrated its 34th anniversary. Read more about some of Hubble’s greatest scientific discoveries.

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NASA Awards Advance Technologies for Future Habitable Worlds Mission

NASA announced Friday it selected three industry proposals to help develop technologies for future large space telescopes and plan for the agency’s Habitable Worlds Observatory mission concept, which could be the first space telescope designed to search for life outside our solar system.

The mission would directly image Earth-like planets around stars like our Sun and study their atmospheres for the chemical signatures of life, as well as enable other investigations about our solar system and universe. NASA is currently in the early planning stages for this mission concept, with community-wide working groups exploring its fundamental science goals and how best to pursue them. The agency is also in the process of establishing a Habitable Worlds Observatory Technology Maturation project office at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

“The Habitable Worlds Observatory will be a historically ambitious mission, so we are taking a deliberate, strategic approach to its development and laying the groundwork now. We will need to bring together diverse expertise from government, academia, and industry, while building on technologies and lessons learned from our previous large space telescopes,” said Mark Clampin, director of the Astrophysics Division at NASA Headquarters in Washington. “With these awards, we’re excited to engage industry to help close technology gaps to make this groundbreaking mission a reality.”

In January 2024, NASA solicited industry proposals to help advance key technologies that will eventually be necessary for the Habitable Worlds Observatory. For example, the mission will require a coronagraph – an instrument that blocks the light of a star so we can better see nearby objects – thousands of times more capable than any prior space coronagraph, and a stable optical system moving no more than the width of an atom during its observations.

To help further the readiness of these technologies, NASA has now selected the following proposals for two-year, fixed-price contracts with a combined value of $17.5 million, targeted to begin by late summer 2024:

• “Ultra-stable Telescope Research and Analysis – Critical Technologies (ULTRA-CT)”
  • This project will focus on high-fidelity modeling and subsystem demonstrations to support future development of “ultra-stable” optical systems beyond current state-of-the-art technologies.
  • Principal investigator: Laura Coyle, Ball Aerospace (now BAE Systems)
• “Technology Maturation for Astrophysics Space Telescopes (TechMAST)”
  • This project seeks to advance the integrated modeling infrastructure required to navigate design interdependencies and compare potential mission design options.
  • Principal investigator: Alain Carrier, Lockheed Martin
• “STABLE: Systems Technologies for Architecture Baseline”
  • This project will focus on maturing technologies that support telescope features, such as a deployable baffle and a structure to support the optical train, while mitigating the impact of system or environmental disturbances.
  • Principal investigator: Tiffany Glassman, Northrop Grumman

This work will continue industry involvement started in 2017 under NASA’s “System-Level Segmented Telescope Design” solicitations, which concluded in December 2023. The new selected proposals will help inform NASA’s approach to planning for the Habitable Worlds Observatory, as the agency builds on technologies from its James Webb Space Telescope and future Nancy Grace Roman Space Telescope and identifies where future investments are needed.

To learn more about NASA’s Habitable Worlds Observatory visit:

https://go.nasa.gov/HWO

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Alise Fisher
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202-358-2546
alise.m.fisher@nasa.gov

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Summary of the 2023 Ocean Surface Topography Science Team Meeting

Severine Fournier, NASA/Jet Propulsion Laboratory, severine.fournier@jpl.nasa.gov
Joshua Willis, NASA/Jet Propulsion Laboratory, joshua.k.willis@jpl.nasa.gov

Introduction

The annual Ocean Surface Topography (OST) Science Team Meeting (STM) provides a forum for the international altimetry community to foster collaboration, address specific issues, and highlight scientific results and applications every year. The meeting location alternates between Europe and the U.S. The 2023 meeting was held in San Juan, Puerto Rico, from November 7–11, 2023. About 130 registrants from more than a dozen different countries attended the meeting.  

During this meeting the OST Science Team addressed specific technical issues related to the reference altimetry missions, which include the Ocean Topography Experiment (TOPEX)–Poseidon (1992–2006), Jason-1 (2001–2013), Ocean Surface Topography Mission (OSTM)/Jason-2 (2008–2019), Jason-3 (2016–present), and Sentinel-6 Michael Freilich (S6MF; 2020–present) missions. There was also discussion about the upcoming Sentinel-6B mission (scheduled for launch in 2025), which will be a successor to S6MF. The technical issues addressed included algorithm and model improvement, calibration/validation (cal/val) activities, merging TOPEX–Poseidon–Jason–S6MF data with those from other altimetric satellites, initial results from the Surface Water and Ocean Topography (SWOT) mission (2022–present), and preparation for future OST missions (e.g., Sentinel-6B).

The remainder of this article provides an overview of the meeting content, then presents an update on the status of current and planned OST missions, followed by a summary of the opening plenary and a couple of the most relevant science highlights from the splinter sessions. More details are available in the full report from the OST STM. The full OST STM program lists all of the presentations from the plenary, splinter, and poster sessions as well as links to many of the presentations and abstracts for the posters.

Meeting Overview

The meeting began with an opening plenary session, followed by an invited presentation, a series of splinter sessions, and a closing plenary session. The splinter session topics spanned a variety of algorithm improvements and measurement uncertainties, as well as sessions on coastal altimetry, the Chinese–French Oceanography Satellite (CFOSAT) mission (2019–present), and science topics ranging from climate and oceanography to hydrology and cryosphere science. A complete list of splinters is available online. Some of these are described in more detail in the sections that follow.

Status Report on Current OST Missions

This section reports on the status of several current and planned OST-related satellite missions. Each is described in its own subsection.

Sentinel-6 Michael Freilich

S6MF, launched on November 21, 2020, from Vandenberg Space Force Base, successfully completed its commissioning and subsequent entry into routine operations on schedule, one year later. S6MF succeeded Jason-3 as the Reference Mission (i.e., the mission that other altimetry missions are compared to) on April 7, 2022, at which point Jason-3 vacated the reference orbit. The first full mission reprocessing of products was released in July 2022, and another full reprocessing was completed in July 2023.

Jason-3

Jason-3, launched on January 17, 2016, continues its extended mission and is fully operational with all redundant systems available. It completed a longer than initially planned 15-month tandem phase with S6MF, which allowed for calibrations of both the primary and redundant instruments. On April 25, 2022, it began operations in an orbit that optimally interleaves ground tracks with S6MF. A second tandem phase with S6MF has been requested for early 2025. The second tandem phase aims to place an uncertainty bound on any long-term drift between the two missions.

Copernicus Copernicus Sentinel-3A and -3B

Sentinel-3A and -3B are identical satellites that were launched in February 16, 2016 and April 25, 2018, respectively. Similar to past missions in the reference orbit, a tandem phase with a separation of 30 seconds between the two satellites was performed to provide cross-calibration. Subsequently, Sentinel-3B was placed in a nominal orbit 140° out of phase with Sentinel-3A. Both missions now provide sea level measurements along high inclination tracks as part of their routine operations. A full mission reprocessing of land altimetry Level-2 (L2) products was completed in 2023.

Copernicus Sentinel-6B and 6C Missions and Beyond

Identical to S6MF, Sentinel-6B is planned as its successor. The spacecraft and instrument have been completed and is now in storage awaiting launch in 2025. Sentinel-6B will assure operational continuity through the end of 2030. An additional satellite, Sentinel-6C, is under consideration by NASA, the National Oceanic and Atmospheric Administration (NOAA), the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), the European Space Agency (ESA), and the Centre National d’Études Spatiale (CNES) [French Space Agency] to continue observations through 2035.

Surface Water Ocean Topography

SWOT launched on December 16, 2022. The primary instrument on SWOT, Ka-band radar interferometer (KaRIn), is the first space-borne, wide-swath altimetry instrument, capable of high-resolution measurements of the water height in the ocean and freshwater bodies. After commissioning and initial calibration, beta products became available to the science team in August 2023. The first images from SWOT were released, and the first results are showing great promise for the instrument capabilities (see NASA and CNES news).

Discussion of Future Missions Relevant to OST

The meeting continued with presentations on several existing and upcoming missions in various stages of development, each with applications relevant to OST. Each presentation included information on the mission’s status and development plans, as described below.

Copernicus Polar Ice and Snow Topography Altimeter (CRISTAL)

Copernicus Polar Ice and Snow Topography Altimeter (CRISTAL) is one of six, high-priority candidate Copernicus Sentinel Expansion missions that are being studied to address the European Union’s needs, as well as to extend the current capabilities of the Copernicus space components. CRISTAL will carry a multifrequency radar altimeter and microwave radiometer to ensure continuity and improve the quality of sea ice thickness measurements compared to its predecessor, Cryosat-2, and provide the first space-based measurements of overlying snow depth.

Recommendations from the OST Science Team

After discussing these missions and other issues concerning altimetry, the OST STM adopted several recommendations to particular topics relating to these missions, which are named and described in the subsections that follow:

S6MF Extended Operations Phase Orbit.  

In light of that fact that user needs remain very high for altimetry observations complementary to the reference mission, the OST ST recommends extending operations of S6MF – assuming it remains in good health – beyond the time when Sentinel-6B has become the reference mission. Specifically, the OST ST recommends:

• Moving S6MF to an exact repeat orbit with the same characteristics as the reference orbit – except for a phase difference of 163° along the orbit, either ahead or behind Sentinel-6B – resulting in an interleaved ground-track to the reference orbit. (For reference, Jason-3 currently flies 163° behind S6MF.)
• Adopting the same data availability requirements as expressed in the End-User Requirements Document (EURD) (R-U- 00460/490/500/515/520/570/573/576) for the extended operations phase of S6MF, with the understanding that Sentinel-6B operations will be prioritized over S6MF.

Jason-3 Orbit Change.

The OST ST endorses the current plan to move Jason-3 to a Long Repeat Orbit (LRO) immediately after the conclusion of second tandem with S6MF. This 371-nodal-day LRO should be the same as the one occupied by Jason-2. The first two LRO cycles should be phased such that Jason-3 will interleave the two Jason-2 LRO cycles, each shifted by 2 km (1.2 mi). This will result in a systematic 2-km global grid combining Jason-2 and Jason-3 LRO data. The OST ST also recommends two additional LRO cycles that revisit the Jason-2 LRO ground tracks to fill in gaps and reduce mean sea surface errors. 

Climate Quality Accuracy in Future Mission 

To achieve accuracy in global and regional sea level change as detailed in the Global Climate Observing System (GCOS) requirements, the OST ST noted that it will be necessary to maintain and continue to improve the accuracy of orbital determination systems, such as those achieved using a combination of three tracking systems – Satellite Laser Ranging [SLR], Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS), and Global Navigation Satellite System [GNSS]). The OST ST has demonstrated that these tracking systems are necessary to achieve maximum accuracy on the determination of regional sea level trends and strongly recommends that such accuracy be maintained in the design of Sentinel-6C. The OST ST also noted that accuracy of the Climate Data Record requires continued maintenance or improvement of the terrestrial reference frame, which also relies on these tracking systems. Finally, requirements on other aspects of the altimetric measurement system must also be maintained or continue to improve. 

Synergies with Argo and GRACE 

Argo (which is an international fleet of robotic instruments that drift with the ocean currents and measure the temperature and salinity of the ocean) plays a critical role in collecting data related to numerous cross-cutting, climate-related science topics important to altimetry measurements (missions discussed earlier in this article), to gravity measurements [e.g., the Gravity Recovery and Climate Experiment (GRACE) and GRACE-Follow-On missions], and to broader science communities. The recent implementation of the Deep Argo mission has rapidly expanded observations of the ocean below 2000 m (~6500 ft). Data collected at these depths has helped to resolve questions about variations of temperature and salinity over the full depth of the ocean and to close regional and global sea level budgets. The OST ST recommends substantially increasing support for the OneArgo Program (which has been part of Argo’s design plan since 2020), including adding resources to expand the array to include global implementation of Deep Argo and increase coverage by Core Argo (the fleet of shallower floats) in polar regions and marginal seas. 

Altimetry Product Evolution 

OST ST recommends that agencies study the performance of the three latency products – Near Real-Time (NRT), Short Time-Critical (STC), and Non-Time Critical (NTC) – to ensure each continues to meet user needs or determine if their performance and latencies be redefined or adjusted. This should be considered across all platforms. 

Potential Gap between CryoSat-2 and CRISTAL 

The OST ST recommends studies to address which satellites, airborne operations, or other assets might help fulfill scientific needs for high-latitude ocean and ice elevation measurements during a potential gap between CryoSat-2 and CRISTAL. The OST ST also recommends minimizing the probability of a gap by extending CryoSat-2 operations through at least 2028 and avoiding delays in the launch of CRISTAL to the extent possible. 

Integrity of the Altimetry Constellation and Instrument Function 

 In light of ongoing efforts to launch a large number of communications satellites in orbits close to the 1336 km (830 mi) altimetry constellation, the OST ST recommends that agencies take steps to determine and establish sufficient margins that will safeguard altimetry missions in both reference and polar orbits from collision, debris, and interference with their passive and active instruments.

Opening Plenary Session Highlights

Severine Fournier [NASA/Jet Propulsion Laboratory (JPL)] began with welcoming remarks on behalf of all of the project scientists, who (in addition to herself) include Josh Willis [NASA/JPL], Pascal Bonnefond [CNES], Eric Leuliette [NOAA], Remko Scharroo [EUMETSAT], and Alejandro Egido [ESA]. In particular, Fournier reminded the participants of the addition of online forums, available until the next OST STM that can be accessed after logging into the site. In addition, Fournier announced that Egido will replace Craig Donlon as the ESA Project Scientist.

Program managers gave presentations on the status of altimetry and oceanographic programs at their respective institutions including: Nadya Vinogradova-Shiffer [NASA Headquarters], Annick Sylvestre-Baron [CNES], Estelle Obligis [EUMETSAT], Eric Leuliette, and Jérôme Bouffard [ESA].

In addition, Josh Willis presented Space Stories, a think tank for U.S.-based creatives and technologists to develop new storytelling approaches to sea level rise. This initiative is organized by Garage Stories and consists of masterclasses that were held in November 2023 with 15 participants across 5 teams. The winning team will have the opportunity to present their concept at JPL in 2024.

Finally, Fernando E. Pabón [Caribbean Center for Rising Seas—Director] spoke about climate issues that impact Puerto Rico. The island has about three million inhabitants and faces several climatic issues, including devastating impacts from hurricanes (with a hurricane season stretching over six months every year), sea level rise, and droughts. While Puerto Rico has a lot of outdated infrastructures, the territory has the most advanced regulatory environment in the Caribbeans. Pabón explained the economic, social, and geographical urgency of making good decisions to help the communities facing climatic challenges with a long-term vision. One of the goals of the Caribbean Center for Rising Seas is to work with practitioners and the public to change urban development practices, update building codes, zoning, and land-use regulations and spread the knowledge and understanding of sea level rise and flooding to the public.

Science Highlights

This section provides two scientifically compelling results that were shown during the splinter sessions. Complete coverage of the results shared during these sessions can be found at the website at the start of the article.

Synergies between Argo, GRACE, and Altimetry

Human activities are increasing the concentration of greenhouse gases, which have increased global temperature since the beginning of the twentieth century. Greenhouse gases trap energy within the Earth system. The ocean absorbs much of this excess energy in the form of heat (> 90%), acting as a huge heat reservoir. Global ocean heat content (GOHC) is therefore a key component in the Earth’s energy budget. Accurate knowledge of the GOHC change allows us to assess the Earth Energy Imbalance (EEI), which refers to the difference between the amount of energy the Earth receives from the Sun and the amount of energy it radiates back into space.

Various methodologies exist to estimate EEI from the GOHC. A 2022 article in Earth System Science Data describes the space geodetic approach, which relies on satellite altimetry and gravimetry measurements. Satellite altimetry is used to measure sea level rise, which is caused by both the expansion of warming ocean waters and the addition of freshwater to the ocean from melting land ice (Greenland and Antarctic ice sheets and mountain glaciers). Gravimetric measurements are used to measure ocean mass change, which can be used to estimate the contribution to sea level rise from freshwater ice melt on land. By combining gravimetry and altimetry, it is possible to estimate the thermal expansion of the entire ocean and scale it to estimate EEI – see Figure 1. The magnitude of EEI is small (0.5–1.0 W/m²) compared to the total amount of energy entering and leaving the climate system (~340 W/m²). Therefore, a high level of precision and accuracy are required to estimate the EEI mean (< 0.3 W/m²) and its time variations at decadal scales (< 0.1 W/m²). In this regard, the space geodetic approach emerges as a promising candidate capable of complementing other observing system elements aimed at measuring EEI.

Large-scale Ocean Circulation Variability and Change

The year-to-year circulation changes along the coast of the western U.S. can have significant impact on the transport of nutrients that affect fisheries. A 2021 article published in the journal Limnology and Oceanography described a study that used ocean currents derived from satellite altimetry to understand the trajectory of water masses from the southern coast of California to the Pacific Northwest. The results show that after a year, subtropical/tropical water masses can reach the Oregon coast from the Southern California Bight (30 °N), and in multiple years from even further south (~26 °N–27 °N) and west. During warmer than average years associated with El Niño Southern Oscillation (1997–1998, 2002–2003, 2004–2005, 2005–2006, 2009–2010, 2014–2015, 2015–2016, 2016–2017), these subtropical/tropical waters masses reached further north compared to other years – see Figure 2. This shift is due to the increase poleward wind stress observed in the California Current. The research team also showed that these tropical warm waters tend to transport “warm water” zooplankton species with a lower fat content. The shift in zooplankton species can impact the young salmon population, which prefer fatty cold-water zooplankton, entering the ocean off the Oregon coast.

Closing Plenary Session Highlights

The closing plenary session included discussions, notably about the key points that were addressed during the opening session and splinter sessions.

Cristina Martin-Puig [EUMETSAT] gave a presentation on the definition of the new Geophysical Data Record (GDR) standards (GDR-G) in a multimission context. There are currently 11 altimeters operating with data quality that continues to undergo improvement. While agencies have been coordinating to homogenize processing baselines across missions, a full harmonization between missions was never discussed in detail until now. All agencies are now working in full collaboration to define a set of common standards and the best data processing practices to ensure full harmony between missions.

Conclusion

During the closing session, the OST ST adopted several recommendations – see “Recommendations from the OST Science Team” above for details.

The OST STM expressed strong support for the continuation of the joint Indo–French Satellite AltiKa (SARAL) drifting period for as long as possible, with its altimeter being the most important for future improvements in mean sea surface and gravity.

The OST STM ended with acknowledgements and kudos, several of which refer to recommendations made by the OST ST. The team expressed its appreciation to NASA and CNES for the successful launch and commissioning of the SWOT mission and its revolutionary new wide-swath altimeter for ocean and surface water. Additional acknowledgements can be found in the full OST STM report link referenced in the introduction of this article.

Overall, the meeting fulfilled all of its objectives. It provided a forum for updates on the status of Jason-3, S6MF, and other relevant missions and programs. It also offered detailed analyses of mission observations by the splinter groups. The team concluded that data from the Jason-3 and S6MF altimeters continue to meet the accuracy and availability requirements of the science community.

An international altimetry meeting to celebrate the 30-year anniversary of altimetry will be held in Montpellier, France on September 2–7, 2024.

Acknowledgment: This article is based on the official meeting report, referenced in the introduction of this article and prepared in cooperation with all of the OST STM chairs: Severine Fournier [JPL]; Josh Willis [JPL]; Pascal Bonnefond [Observatoire de Paris, Laboratoire Systèmes de Référence Temps-Espace (SYRTE)/CNES]; Eric Leuliette [NOAA]; Remko Scharroo [EUMETSAT]; and Alejandro Egido [ESA].

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