Take 5 with Brad Zavodsky

By Wayne Smith

Brad Zavodsky’s interest in science piqued at a young age. Growing up in Cincinnati, Ohio, both of his parents were teachers and they instilled in him a sense of curiosity about the world.

“My dad was a middle school science teacher and he was great at communicating science and helping others understand how the world works,” said Zavodsky, the mission manager of NASA’s Psyche asteroid mission for the Planetary Missions Program Office at Marshall Space Flight Center. “I like to say that working in the program office takes me back to being a student, staring in wonder at pictures of the planets in textbooks. Now, I get to work on projects that are re-writing those same books! I really enjoy sharing the planetary missions’ scientific discoveries with my family and giving back to those who first cultivated my scientific interest.”

The Psyche mission – a journey to a unique metal-rich asteroid orbiting the Sun between Mars and Jupiter – is scheduled to launch Oct. 5 on a Falcon Heavy from NASA’s Kennedy Space Center. What makes the asteroid Psyche unique is that it appears to be the exposed nickel-iron core of an early planet, one of the building blocks of our solar system. Psyche is part of NASA’s Discovery Program, also managed by Marshall.

Zavodsky’s sense of curiosity continues to drive him. He is also motivated and shares the enthusiasm of PIs (principal investigators) and science teams in the Planetary Missions program.

“Our PIs are extraordinary leaders in their scientific disciplines and have worked their whole careers to get to the point where they are leading a mission for NASA,” Zavodsky said. “It is exciting to be able to help them achieve their goals and objectives.”

Just being a small part of the revolutionary science data that our projects collect pushes me to do my best every day.

Brad Zavodsky

Mission manager of NASA’s Psyche

Question: What are your primary responsibilities as program manager for the Psyche mission?

Zavodsky: I am responsible for ensuring the project has the resources necessary to successfully accomplish the mission. I am also responsible for overseeing the technical, cost, and schedule aspects of the project and ensuring that stakeholders within NASA are informed about any risks in those areas. The goal is to enhance the probability of mission success through providing this oversight. Additionally, I help the project navigate NASA processes and procedures, specifically the NASA Space Flight Program and project management requirements to confirm that they are compliant with all the necessary requirements to prepare them for gate reviews and decisional meetings.

Question: What excites you most about the future of human space exploration and your team’s role in it?

Zavodsky: The planetary bodies we target are unique, and many times, the first time humans have visited a location in our solar system. Psyche is humanity’s first visit to a metal asteroid. We have visited rocky bodies like Mercury and asteroids, icy bodies like comets, and gas bodies like Jupiter and Saturn, but this will be the first time we have visited a metal body. One of Psyche’s objectives is to identify whether the Psyche asteroid is a remnant planet core like Earth’s core, which could teach us about the early history of our own planet. Some of our other projects are targeting Jupiter’s moon, Europa, and Saturn’s moon, Titan, to identify environments that may sustain or once may have sustained life. It is exciting to have a front row seat for these types of exploration projects that are helping to solve some of humanity’s longest-standing questions about the universe.

Question: What has been the proudest moment of your career and why?

Zavodsky: I had the opportunity to support the acquisition process for the 2019 Discovery Program Announcement of Opportunity. I assisted the program scientist in preparing the panels that reviewed the various mission concepts, managing the review process, and communicating the results of the review to decision makers at NASA Headquarters. Being in that role allowed me to participate in several decisional meetings at headquarters, which provided incredible insight into how NASA selects missions and the types of programmatic considerations that are required when making such decisions. This Announcement of Opportunity ultimately led to the selection of the DAVINCI (Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging) and VERITAS (Venus Emissivity, Radio Science, InSAR, Topography, and Spectroscopy) missions to Venus, the first NASA missions to our neighbor planet in over three decades. When those missions were announced by the NASA administrator, I was extremely proud to have played a role in the process.

Question: What advice do you have for employees early in their NASA career or those in new leadership roles?

Zavodsky: When presented with new work or training opportunities, say yes. Trust that your supervisor is putting you in a position to learn a valuable skill and setting you up to succeed. If you are not getting those opportunities, communicate to your supervisor about your willingness to learn new skills or try a new role. Taking stretch assignments or accepting a new role can be intimidating, but every job requires some on-the-job training, so you can never expect to be an expert on day one. While you may not feel like you have all the experience needed, if you identify others who have experience, establish good relationships, and ask lots of good questions, you can accomplish anything.

Question: What do you enjoy doing with your time while away from work?

Zavodsky: I enjoy watching sports during my time away from work. Having grown up in Cincinnati, I am a lifelong Cincinnati Reds, Cincinnati Bengals, and University of Cincinnati Bearcats basketball fan. Since moving to Huntsville in 2005, I have also become a big University of Alabama football fan.”

Smith, a Media Fusion employee and the Marshall Star editor, supports the Marshall Office of Communications.

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Countdown to Psyche: Marshall Aids Preparations for Asteroid Mission, Key Technology Payload

By Rick Smith

When the Psyche spacecraft lifts off Oct. 5 to rendezvous with a distant, metal-rich asteroid – and test an innovative new communications system on the way – management teams at NASA’s Marshall Space Flight Center will be watching keenly.

Psyche is the 14th planetary exploration mission in NASA’s Discovery program, which is managed for the agency by Marshall – as is the TDM (Technology Demonstration Missions) program, which funds the DSOC (Deep Space Optical Communications) project.

“We ensure the project teams have all the resources they need to execute the project, monitor costs and schedules to keep the project on track and on time, and work closely with the payload and launch teams throughout the flight mission,” said Brad Zavodsky, Psyche mission manager in Marshall’s Planetary Missions Program Office.

Joel Robinson, DSOC mission manager at Marshall, concurs. He and Zavodsky serve as “conduits,” he said, between directorate-level technology and science leadership at NASA Headquarters and the Psyche and DSOC project leadership – both of which, serendipitously, are managed at NASA’s Jet Propulsion Laboratory.

The program office teams at Marshall include program planning and control personnel, independent technical authorities, and procurement and acquisition specialists. These technical experts provide the Psyche and DSOC missions with all necessary guidance and direction throughout their respective development and programmatic life cycles.

“That means a number of presentations, weekly telecons, and periodic reviews,” Robinson said, “but it’s all worth it as we count down to launch. All that oversight helps facilitate delivery of a robust payload – one that’s ready for launch and ready to extend humanity’s reach into the solar system.”

Led by principal investigator Dr. Lindy Elkins-Tanton at Arizona State University, Psyche is set to be lofted to space on a SpaceX Falcon Heavy – the first interplanetary launch of that rocket – from NASA’s Kennedy Space Center at 9:34 a.m. CDT on Oct. 5.

Powered by solar electric propulsion, Psyche’s flight to the asteroid will take six years; it will reach its destination in 2029 and begin a 26-month period of scheduled scientific observations, gathering images and data to shed new light on the asteroid’s history and composition.

The Psyche asteroid, orbiting the Sun in the asteroid belt between Mars and Jupiter, measures roughly 173 miles at its widest point. Researchers are keen to determine whether it may have been the core of a planetesimal, part of an early planet.

“We know a good deal about Earth’s core, but we can’t study it directly because of its depth below the crust and mantle,” Zavodsky said. “Investigating Psyche is perhaps the closest we can come. Studying its composition and structure is an exciting opportunity to learn more about such objects in space – and perhaps a little something about our own planet as well.”

Should the Psyche spacecraft encounter challenges during flight, Zavodsky’s team will assist mission managers at JPL and Arizona State University, for whom Marshall oversees the project management and principal investigator contracts.

“We’ll maintain direct engagement with the project team and NASA decision-making authorities,” he said. “Should an issue arise, the project will be prepared to stand up anomaly response teams to understand and resolve those challenges. Our program office will support that effort as needed.”

Meanwhile, the DSOC technology demonstrator is set to pursue its own mission, sending and receiving test data from Earth using a near-invisible infrared laser and sensitive photon-counting camera. It will mark NASA’s farthest-ever test of high-bandwidth optical communications – paving the way for broadband communications when NASA sends astronauts to Mars.

“We’re tackling the twin issues of bandwidth and transmission rate to expand and refine our data-gathering ability from missions beyond the Moon,” Robinson said. “We can’t transmit data faster than the speed of light, but we can do far more with advanced optical systems of the same size and power requirements as traditional radio systems.”

Building on the Lunar Laser Communications Demonstration mission flown on the International Space Station in 2013 and the Laser Communications Relay Demonstration, launched to geostationary orbit above Earth in 2021, the DSOC effort is the first to experiment with ultra-long-range, laser-based communications.

“It’s exciting to take optical communications capabilities into deep space for the first time,” Robinson said.

DSOC could deliver 10 to 100 times the data current radio systems are capable of transmitting, with far greater precision and clarity.

Joel Robinson

DSOC mission manager at Marshall

DSOC will test its optical transmission capabilities at and beyond a range of 1 astronomical unit, which is about 93 million miles – or the distance from the Sun to Earth. Psyche proves to be the perfect means to that end, requiring a gravity-assisting pass around the Sun in order to accelerate on its journey to the Psyche asteroid.

JPL laser researchers in California will send optical data to the DSOC payload during pre-conjunction – the period before the spacecraft is blocked by the Sun itself – and again during post-conjunction.

Smith, a Manufacturing Technical Solutions employee, supports the Marshall Office of Communications.

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Copernicus Trajectory Design and Optimization System

Copernicus, a generalized spacecraft trajectory design and optimization system, is capable of solving a wide range of trajectory problems such as planet or moon centered trajectories, libration point trajectories, planet-moon transfers and tours, and all types of interplanetary and asteroid/comet missions.

Latest News

• January 21, 2022: Copernicus Version 5.2 is now available. This update includes many bug fixes and various new features and refinements.
• June 17, 2021: Copernicus was selected as winner of the 2021 NASA Software of the Year Award.
• March 4, 2021: Copernicus Version 5.1 is now available. This updates includes many bug fixes and various new features and refinements.
• June 26, 2020: Copernicus Version 5.0 is now available. This is a significant update to Copernicus and includes: A new modern Python-based GUI that is now cross-platform and fully functional on Windows, Linux, and macOS, 3D graphics upgrades including antialiasing and celestial body shadowing, a new Python scripting interface, many other new features and options, and bug fixes.
• May 1, 2018: Copernicus Version 4.6 is now available. The release includes the following changes: a new cross-platform JSON kernel file format, various new reference frame features, including new capabilities for user-defined reference frame plugins, and numerous bug fixes and other minor enhancements.
• January 24, 2018: Copernicus Version 4.5 is now available. The new version includes a new experimental Mac version, faster exporting of segment data output files (including the addition of a new binary HDF5 format), some new GUI tools, new plugin capabilities, and numerous other new features and bug fixes.
• October 1, 2016: Copernicus Version 4.4 is now available. The new version includes 3D graphics improvements and various other new features and bug fixes.
• February 8, 2016: Copernicus Version 4.3 is now available. The new version includes updates to the plugin interface, a new differential corrector solution method, updated SPICE SPK files, updates to the Python interface, new training videos, as well as numerous other refinements and bug fixes.
• July 21, 2015: Copernicus Version 4.2 is now available.  The update includes further refinements to the new plugin feature, as well as various other new features and some bug fixes.
• April 13, 2015: Copernicus Version 4.1 is now available.  This update includes a new plugin architecture to enable extending Copernicus with user-created algorithms.  It also includes a new Python interface, as well as various other new features and bug fixes.
• August 13, 2014: Copernicus Version 4.0 is now available.  This is an update to version 3.1, which was released in June 2012.  The new release includes many new features, bug fixes, performance and stability improvements, as well as a redesigned GUI, a new user guide, and full compatibility with Windows 7.  The update is recommended for all Copernicus users.

Development

The Copernicus Project started at the University of Texas at Austin in August 2001. In June 2002, a grant from the NASA Johnson Space Center (JSC) was used to develop the first prototype which was completed in August 2004. In the interim, support was also received from NASA’s In Space Propulsion Program and from the Flight Dynamics Vehicle Branch of Goddard Spaceflight Center. The first operational version was completed in March 2006 (v1.0). The initial development team consisted of Dr. Cesar Ocampo and graduate students at the University of Texas at Austin Department of Aerospace Engineering and Engineering Mechanics. Since March 2007, primary development of Copernicus has been at the Flight Mechanics and Trajectory Design Branch of JSC.

Request Copernicus

The National Aeronautics and Space Act of 1958 and a series of subsequent legislation recognized transfer of federally owned or originated technology to be a national priority and the mission of each Federal agency. The legislation specifically mandates that each Federal agency have a formal technology transfer program, and take an active role in transferring technology to the private sector and state and local governments for the purposes of commercial and other application of the technology for the national benefit. In accordance with NASA’s obligations under mandating legislation, JSC makes Copernicus available free of charge to other NASA centers, government contractors, and universities, under the terms of a US government purpose license.  Organizations interested in obtaining Copernicus should click here.

For Copernicus-based analysis requests or specific Copernicus modifications that would support your project, please contact Gerald L. Condon (gerald.l.condon@nasa.gov) at the NASA Johnson Space Center.

Current Version

The current version of Copernicus is 5.2 (released January 21, 2022).

References

Publications about Copernicus

• C. A. Ocampo, “An Architecture for a Generalized Trajectory Design and Optimization System”, Proceedings of the International Conference on Libration Points and Missions, June, 2002.
• C. A. Ocampo, “Finite Burn Maneuver Modeling for a Generalized Spacecraft Trajectory Design and Optimization System”, Annals of the New York Academy of Science, May 2004.
• C. A. Ocampo, J. Senent, “The Design and Development of Copernicus: A Comprehensive Trajectory Design and Optimization System”, Proceedings of the International Astronautical Congress, 2006. IAC-06-C1.4.04.
• R. Mathur, C. A. Ocampo, “An Architecture for Incorporating Interactive Visualizations into Scientific Simulations”, Advances in the Astronautical Sciences, Feb. 2007.
• C. A. Ocampo, J. S. Senent, J. Williams, “Theoretical Foundation of Copernicus: A Unified System for Trajectory Design and Optimization”, 4th International Conference on Astrodynamics Tools and Techniques, May 2010.
• J. Williams, J. S. Senent, C. A. Ocampo, R. Mathur, “Overview and Software Architecture of the Copernicus Trajectory Design and Optimization System”, 4th International Conference on Astrodynamics Tools and Techniques, May 2010.
• J. Williams, J. S. Senent, D. E. Lee, “Recent Improvements to the Copernicus Trajectory Design and Optimization System”, Advances in the Astronautical Sciences, 2012.
• J. Williams, “A New Architecture for Extending the Capabilities of the Copernicus Trajectory Optimization Program”, Advances in the Astronautical Sciences, 2015, volume 156.
• J. Williams, R. D. Falck, and I. B. Beekman. “Application of Modern Fortran to Spacecraft Trajectory Design and Optimization“, 2018 Space Flight Mechanics Meeting, AIAA SciTech Forum, (AIAA 2018-1451)
• J. Williams, A. H. Kamath, R. A. Eckman, G. L. Condon, R. Mathur, and D. Davis, “Copernicus 5.0: Latest Advances in JSC’s Spacecraft Trajectory Optimization and Design System”, 2019 AAS/AIAA Astrodynamics Specialist Conference, Portland, ME, August 11-15, 2019, AAS 19-719

Some studies that have used Copernicus

• C. L. Ranieri, C. A. Ocampo, “Optimization of Roundtrip, Time-Constrained, Finite Burn Trajectories via an Indirect Method”, Journal of Guidance, Control, and Dynamics, Vol. 28, No. 2, March-April 2005.
• T. Polsgrove, L. Kos, R. Hopkins, T. Crane, “Comparison of Performance Predictions for New Low-Thrust Trajectory Tools”, AIAA/AAS Astrodynamics Specialist Conference, August, 2006.
• L. D. Kos, T. P. Polsgrove, R. C. Hopkins, D. Thomas and J. A. Sims, “Overview of the Development for a Suite of Low-Thrust Trajectory Analysis Tools”, AIAA/AAS Astrodynamics Specialist Conference, August, 2006.
• M. Garn, M. Qu, J. Chrone, P. Su, C. Karlgaard, “NASA’s Planned Return to the Moon: Global Access and Anytime Return Requirement Implications on the Lunar Orbit Insertion Burns”, AIAA/AAS Astrodynamics Specialist Conference and Exhibit, August, 2008.
• R. B. Adams, “Near Earth Object (NEO) Mitigation Options Using Exploration Technologies”, Asteroid Deflection Research Symposium, Oct. 2008.
• J. Gaebler, R. Lugo, E. Axdahl, P. Chai, M. Grimes, M. Long, R. Rowland, A. Wilhite, “Reusable Lunar Transportation Architecture Utilizing Orbital Propellant Depots”, AIAA SPACE 2009 Conference and Exposition, September 2009.
• J. Williams, E. C. Davis, D. E. Lee, G. L. Condon, T. F. Dawn, “Global Performance Characterization of the Three Burn Trans-Earth Injection Maneuver Sequence over the Lunar Nodal Cycle”, Advances in the Astronautical Sciences, Vol. 135, 2010. AAS 09-380
• J. Williams, S. M. Stewart, D. E. Lee, E. C. Davis, G. L. Condon, T. F. Dawn, J. Senent, “The Mission Assessment Post Processor (MAPP): A New Tool for Performance Evaluation of Human Lunar Missions”, 20th AAS/AIAA Space Flight Mechanics Meeting, Feb. 2010.
• J. W. Dankanich, L. M. Burke, J. A. Hemminger, “Mars sample return Orbiter/Earth Return Vehicle technology needs and mission risk assessment”, 2010 IEEE Aerospace Conference, March 2010.
• A. V. Ilin, L. D. Cassady, T. W. Glover, M. D. Carter, F. R. Chang Diaz, “A Survey of Missions using VASIMR for Flexible Space Exploration”, Ad Astra Rocket Company, Document Number JSC-65825, April 2010.
• J. W. Dankanich, B. Vondra, A. V. Ilin, “Fast Transits to Mars Using Electric Propulsion”, 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, July 2010.
• S. R. Oleson, M. L. McGuire, L. Burke, J. Fincannon, T. Colozza, J. Fittje, M. Martini, T. Packard, J. Hemminger, J. Gyekenyesi, “Mars Earth Return Vehicle (MERV) Propulsion Options”, 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, July 2010, AIAA 2010-6795.
• J. S. Senent, “Fast Calculation of Abort Return Trajectories for Manned Missions to the Moon”, AIAA/AAS Astrodynamics Specialist Conference, August 2010.
• D. S. Cooley, K. F. Galal, K. Berry, L. Janes, G. Marr. J. Carrico. C. Ocampo, “Mission Design for the Lunar CRater Observation and Sensing Satellite (LCROSS)”, AIAA/AAS Astrodynamics Specialist Conference, August, 2010.
• A. V. Ilin, L. D. Cassady, T. W. Glover, F. R. Chang Diaz, “VASIMR Human Mission to Mars”, Space, Propulsion & Energy Sciences International Forum, March 15-17, 2011.
• J. Brophy, F. Culick, L. Friedman, et al., “Asteroid Retrieval Feasibility Study,” Technical Report, Keck Institute for Space Studies, California Institute of Technology, Jet Propulsion Laboratory, April 2012.
• A. V. Ilin, “Low Thrust Trajectory Analysis (A Survey of Missions using VASIMR for Flexible Space Exploration – Part 2), Ad Astra Rocket Company, Document Number JSC-66428, June 2012.
• P. R. Chai, A. W. Wilhite, “Station Keeping for Earth-Moon Lagrangian Point Exploration Architectural Assets”, AIAA SPACE 2012 Conference & Exposition, September, 2012, AIAA 2012-5112.
• F. R. Chang Diaz, M. D. Carter, T. W. Glover, A. V. Ilin, C. S. Olsen, J. P. Squire, R. J. Litchford, N. Harada, S. L. Koontz, “Fast and Robust Human Missions to Mars with Advanced Nuclear Electric Power and VASIMR Propulsion”, Proceedings of Nuclear and Emerging Technologies for Space, Feb. 2013. Paper 6777.
• J. Williams, “Trajectory Design for the Asteroid Redirect Crewed Mission”, JSC Engineering, Technology and Science (JETS) Contract Technical Brief JETS-JE23-13-AFGNC-DOC-0014, July, 2013.
• J.P. Gutkowski, T.F. Dawn, R.M. Jedrey, “Trajectory Design Analysis over the Lunar Nodal Cycle for the Multi-Purpose Crew Vehicle (MPCV) Exploration Mission 2 (EM-2)”, Advances in the Astronautical Sciences Guidance, Navigation and Control, Vol. 151, 2014. AAS 14-096.
• R. G. Merrill, M. Qu, M. A. Vavrina, C. A. Jones, J. Englander, “Interplanetary Trajectory Design for the Asteroid Robotic Redirect Mission Alternate Approach Trade Study”, AIAA/AAS Astrodynamics Specialist Conference, 2014. AIAA 2014-4457.
• J. Williams, G. L. Condon. “Contingency Trajectory Planning for the Asteroid Redirect Crewed Mission”, SpaceOps 2014 Conference (AIAA 2014-1697).
• J. Williams, D. E. Lee, R. J. Whitley, K. A. Bokelmann, D. C. Davis, and C. F. Berry. “Targeting cislunar near rectilinear halo orbits for human space exploration“, AAS 17-267
• T. F. Dawn, J. Gutkowski, A. Batcha, J. Williams, and S. Pedrotty. “Trajectory Design Considerations for Exploration Mission 1“, 2018 Space Flight Mechanics Meeting, AIAA SciTech Forum, (AIAA 2018-0968)
• A. L. Batcha, J. Williams, T. F. Dawn, J. P. Gutkowski, M. V. Widner, S. L. Smallwood, B. J. Killeen, E. C. Williams, and R. E. Harpold, “Artemis I Trajectory Design and Optimization”, AAS/AIAA Astrodynamics Specialist Conference, August 9-12, 2020, AAS 20-649

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Jacob Williams

NASA-Led Study Pinpoints Areas of New York City Sinking, Rising

Scientists using space-based radar found that land in New York City is sinking at varying rates from human and natural factors. A few spots are rising.

Parts of the New York City metropolitan area are sinking and rising at different rates due to factors ranging from land-use practices to long-lost glaciers, scientists have found. While the elevation changes seem small – fractions of inches per year – they can enhance or diminish local flood risk linked to sea level rise.

The new study was published Wednesday in Science Advances by a team of researchers from NASA’s Jet Propulsion Laboratory in Southern California and Rutgers University in New Jersey. The team analyzed upward and downward vertical land motion – also known as uplift and subsidence – across the metropolitan area from 2016 to 2023 using a remote sensing technique called interferometric synthetic aperture radar (InSAR). The technique combines two or more 3D observations of the same region to reveal surface motion or topography.

Much of the motion they observed occurred in areas where prior modifications to Earth’s surface – such as land reclamation and the construction of landfills – made the ground looser and more compressible beneath subsequent buildings.

Some of the motion is also caused by natural processes dating back thousands of years to the most recent ice age. About 24,000 years ago, a huge ice sheet spread across most of New England, and a wall of ice more than a mile high covered what is today Albany in upstate New York. Earth’s mantle, somewhat like a flexed mattress, has been slowly readjusting ever since. New York City, which sits on land that was raised just outside the edge of the ice sheet, is now sinking back down.

The scientists found that on average the metropolitan area subsided by about 0.06 inches (1.6 millimeters) per year – about the same amount that a toenail grows in a month. Using the radars on the ESA (European Space Agency) Sentinel-1 satellites, along with advanced data processing techniques, they mapped the motion in detail and pinpointed neighborhoods and landmarks – down to an airport runway and tennis stadium – that are subsiding more rapidly than the average.

“We’ve produced such a detailed map of vertical land motion in the New York City area that there are features popping out that haven’t been noticed before,” said lead author Brett Buzzanga, a postdoctoral researcher at JPL.

David Bekaert, a JPL scientist and lead investigator of the project, said that tracking local elevation changes and relative sea level can be important for flood mapping and planning purposes. This is especially critical as Earth’s changing climate pushes oceans higher around the world, leading to more frequent nuisance flood events and exacerbating destructive storm surges.

Local Changes

The team identified two notable hot spots of subsidence co-located with landfills in Queens. One, runway 13/31 at LaGuardia Airport, is subsiding at a rate of about 0.15 inches (3.7 millimeters) per year. The scientists noted that the airport is undergoing an $8 billion renovation designed in part to alleviate flooding from the rising waters of the Atlantic Ocean. They also identified Arthur Ashe Stadium, which is sinking at a rate of about 0.18 inches (4.6 millimeters) per year and required construction of a lightweight roof during renovation to reduce its heaviness and amount of subsidence.

Other subsidence hot spots include the southern portion of Governors Island – built on 38 million square feet (3.5 million cubic meters) of rocks and dirt from early 20th century subway excavations – as well as sites near the ocean in Brooklyn’s Coney Island and Arverne by the Sea in Queens that were built on artificial fill. Similar levels of subsidence were observed beneath Route 440 and Interstate 78 in suburban New Jersey, which traverse historic fill locations, and in Rikers Island, expanded to its present size by landfilling.

The scientists also found previously unidentified uplift in East Williamsburg, Brooklyn – rising by about 0.06 inches (1.6 millimeters) per year – and in Woodside, Queens, which rose 0.27 inches (6.9 millimeters) per year between 2016 and 2019 before stabilizing. Co-author Robert Kopp of Rutgers University said that groundwater pumping and injection wells used to treat polluted water may have played a role, but further investigation is needed. “I’m intrigued by the potential of using high-resolution InSAR to measure these kinds of relatively short-lived environmental modifications associated with uplift,” Kopp said.

The scientists said that cities like New York, which are investing in coastal defenses and infrastructure in the face of sea level rise, can benefit from high-resolution estimates of land motion.

The JPL-led OPERA (Observational Products for End-Users from Remote Sensing Analysis) project will detail surface displacement across North America in a future data product. To do that, it will leverage InSAR data from ESA’s Sentinel-1 and from the upcoming NISAR (NASA-Indian Space Research Organization Synthetic Aperture Radar) mission, set to launch in 2024. Information from OPERA will help scientists better monitor vertical land motion along with other changes connected to natural hazards.

Jane J. Lee / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-0307 / 626-379-6874
jane.j.lee@jpl.nasa.gov / andrew.wang@jpl.nasa.gov

Written by Sally Younger

2023-137

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Naomi Hartono

Regreso del astronauta de la NASA que batió récords y sus compañeros

El astronauta de la NASA Frank Rubio aterrizó sano y salvo en la Tierra con sus compañeros de tripulación el miércoles, tras pasar 371 días en el espacio, un récord para Estados Unidos.

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