Geodesy and Geophysics Laboratory

Bryant D. Loomis


Bryant D. Loomis's Contact Card & Information.
Phone: 301.614.5590
Org Code: 61A
Mail Code 61A
Greenbelt, MD 20771

Missions & Projects

Current Projects

GRACE and GRACE-FO Science Team

GRACE-FO Science Data System (SDS)

NASA High Mountain Asia Team (HiMAT)

NASA Sea Level Change Team (N-SLCT)

NASA Mass Change Designated Observable Study Team


Chief Scientist

SGT Inc., Science Division - Greenbelt, MD

2009 - 2017

Research Geophysicist

NASA Goddard Space Flight Center - Greenbelt, MD

2017 - Present

Chief, Geodesy and Geophysics Laboratory

NASA Goddard Space Flight Center - Greenbelt, MD

2022 - Present


B.S. Engineering, Hope College

M.S. Aerospace Engineering Sciences, University of Colorado at Boulder

Ph.D. Aerospace Engineering Sciences, University of Colorado at Boulder


2020 NASA Exceptional Scientific Achievement Medal

2020 NASA GSFC HBG Best Publication Peer Award

2016 NASA GSFC Robert H. Goddard Exceptional Achievement for Science, Individual

2016 NASA GSFC Solar System Exploration Division Peer Award

2014 NASA GSFC Robert H. Goddard Exceptional Achievement for Science Team (GRAIL)

Other Professional Information

GRACE & GRACE-FO data website:

Satellite laser ranging data website:



2024. "Snowfall Replenishes Groundwater Loss in the Great Basin of the Western United States, but Cannot Compensate for Increasing Aridification." Geophysical Research Letters 51 (6): [10.1029/2023gl107913] [Journal Article/Letter]

2023. "Choice of observation type affects Bayesian calibration of Greenland Ice Sheet model simulations." The Cryosphere 17 (11): 4661-4673 [10.5194/tc-17-4661-2023] [Journal Article/Letter]

2023. "Impacts of SLR Ground Station Geographic Distribution on Time‐Variable Gravity Recovery." Journal of Geophysical Research: Solid Earth [10.1029/2023jb026638] [Journal Article/Letter]

2023. "The impact of new accelerometer transplant data (ACH) on GRACE Follow‐On along‐orbit inter‐satellite laser ranging observations and monthly time‐variable gravity and mascon solutions." Journal of Geophysical Research: Solid Earth [10.1029/2023jb026740] [Journal Article/Letter]

2023. "Mass balance of the Greenland and Antarctic ice sheets from 1992 to 2020." Earth System Science Data 15 (4): 1597-1616 [10.5194/essd-15-1597-2023] [Journal Article/Letter]

2023. "Climate and human impacts on hydrological processes and flood risk in southern Louisiana." Water Resources Research [10.1029/2022wr033238] [Journal Article/Letter]

2023. "Modelling the Greenland Ice Sheet’s committed contribution to sea level during the 21st Century." Journal of Geophysical Research: Earth Surface 128 (2): e2022JF006914 [10.1029/2022jf006914] [Journal Article/Letter]

2022. "Simulation of a Future SLR Satellite to Improve Low‐Degree Gravity Estimates." Journal of Geophysical Research: Solid Earth 127 (12): [10.1029/2022jb025743] [Journal Article/Letter]

2022. "Choice of observation type affects Bayesian calibration of ice sheet model projections." EGUsphere [preprint] [10.5194/egusphere-2022-1213] [Journal Article/Letter]

2022. "The Arctic." Bulletin of the American Meteorological Society 103 (8): S257-S306 [10.1175/bams-d-22-0082.1] [Journal Article/Letter]

2022. "The Mass Change Designated Observable Study: Overview and Results." Earth and Space Science [10.1029/2022ea002311] [Journal Article/Letter]

2022. "Arctic Report Card 2022: Greenland Ice Sheet." NOAA technical report OAR ARC; 22-05 [] [Report]

2021. "High‐spatial‐resolution mass rates from GRACE and GRACE‐FO: Global and ice sheet analyses." Journal of Geophysical Research: Solid Earth 126 (12): e2021JB023024 [10.1029/2021JB023024] [Journal Article/Letter]

2021. "Greenland Ice Sheet. Arctic Report Card 2021." NOAA Arctic Report Card 2021 NOAA OAR ARC; 21-04 1-9 [10.25923/546g-ms61] [Report]

2021. "GRACE Fast Mascons From Spherical Harmonics and a Regularization Design Trade Study." Journal of Geophysical Research: Solid Earth 126 (8): [10.1029/2021jb022113] [Journal Article/Letter]

2021. "The mean seasonal cycle in relative sea level from satellite altimetry and gravimetry." Journal of Geodesy 95 80 [10.1007/s00190-021-01529-1] [Journal Article/Letter]

2021. "Mass balance of the Antarctic ice sheet 1992–2016: reconciling results from GRACE gravimetry with ICESat, ERS1/2 and Envisat altimetry." Journal of Glaciology 67 (263): 533-559 [10.1017/jog.2021.8] [Journal Article/Letter]

2020. "Greenland Ice Sheet." Arctic Report Card 2020 35-43 [10.25923/ms78- g612] [Report]

2020. "Anomalous circulation in July 2019 resulting in mass loss on the Greenland ice sheet." Geophysical Research Letters 47 (17): [10.1029/2020GL087263] [Journal Article/Letter]

2020. "Comparison of Vertical Surface Deformation Estimates Derived from Space‐based Gravimetry, Ground‐based GPS, and Model‐based Hydrologic Loading over Snow‐dominated Watersheds in the United States." Journal of Geophysical Research: Solid Earth 125 (e2020JB019432): [Full Text] [10.1029/2020jb019432] [Journal Article/Letter]

2020. "Extending the global mass change data record: GRACE Follow‐On instrument and science data performance." Geophysical Research Letters 47 (12): e2020GL088306 [10.1029/2020gl088306] [Journal Article/Letter]

2020. "Mass balance of the Greenland Ice Sheet from 1992 to 2018." Nature 579 233-239 [10.1038/s41586-019-1855-2] [Journal Article/Letter]

2020. "Development of a Daily GRACE Mascon Solution for Terrestrial Water Storage." Journal of Geophysical Research: Solid Earth 125 (3): [10.1029/2019jb018468] [Journal Article/Letter]

2020. "Replacing GRACE/GRACE‐FO C30 with satellite laser ranging: Impacts on Antarctic Ice Sheet mass change." Geophysical Research Letters 47 (3): e2019GL085488 [10.1029/2019gl085488] [Journal Article/Letter]

2019. "Water Storage Trends in High Mountain Asia." Frontiers in Earth Science 7 [10.3389/feart.2019.00235] [Journal Article/Letter]

2019. "Improved Earth oblateness rate reveals increased ice sheet losses and mass‐driven sea level rise." Geophysical Research Letters 2019GL082929 [10.1029/2019gl082929] [Journal Article/Letter]

2019. "Tests of ocean-tide models by analysis of satellite-to-satellite range measurements: An update." Geophysical Journal International 217 (2): 1174-1178 [10.1093/gji/ggz062] [Journal Article/Letter]

2019. "Regularization and error characterization of GRACE mascons." Journal of Geodesy [10.1007/s00190-019-01252-y] [Journal Article/Letter]

2018. "A Transfer Function Between Line-of-Sight Gravity Difference and GRACE Intersatellite Ranging Data and an Application to Hydrological Surface Mass Variation." Journal of Geophysical Research: Solid Earth 123 (10): 9186-9201 [10.1029/2018jb016088] [Journal Article/Letter]

2018. "In-Situ and GRACE-based Groundwater Observations: Similarities, Discrepancies, and Evaluation in the High Plains Aquifer in Kansas." Water Resources Research 54 (10): 8034-8044 [10.1029/2018wr023836] [Journal Article/Letter]

2018. "Mass balance of the Antarctic Ice Sheet from 1992 to 2017." Nature 558 (7709): 219-222 [10.1038/s41586-018-0179-y] [Journal Article/Letter]

2018. "Global sea-level budget 1993--present." Earth System Science Data 10 (3): 1551--1590 [10.5194/essd-10-1551-2018] [Journal Article/Letter]

2017. "Mass evolution of Mediterranean, Black, Red, and Caspian Seas from GRACE and altimetry: accuracy assessment and solution calibration." J. Geodesy 91 (2): 195-206 [10.1007/s00190-016-0952-3] [Journal Article/Letter]

2014. "Gravimetry measurements from space." Remote Sensing of the Cryosphere 231-247 [10.1002/9781118368909.ch10] [Article in Book]

2014. "GRGM900C: A degree-900 lunar gravity model from GRAIL primary and extended mission data." Geophys. Res. Lett. 41 (10): 3382-3389 [Full Text] [10.1002/2014GL060027] [Journal Article/Letter]

2014. "Optimized signal denoising and adaptive estimation of seasonal timing and mass balance from simulated GRACE-like regional mass variations." Adv. Adapt. Data Anal. 06 (01): 1450003 [10.1142/s1793536914500034] [Journal Article/Letter]

2013. "High-degree gravity models from GRAIL primary mission data." J. Geophys. Res.-Planets 118 1676-1698 [10.1002/jgre.20118] [Journal Article/Letter]

2013. "Antarctica, Greenland and Gulf of Alaska land ice evolution from an iterated GRACE global mascon solution." Journal of Glaciology 216 613-631 [10.3189/2013JoG12J147] [Journal Article/Letter]

2012. "Simulation study of a follow-on gravity mission to GRACE." Journal of Geodesy 86 (5): 319-335 [10.1007/s00190-011-0521-8] [Journal Article/Letter]


2021. "The Arctic." Bulletin of the American Meteorological Society 102 (8): S263-S316 [] [Journal Article/Letter]

2016. "A global degree and order 1200 model of the lunar gravity field using GRAIL mission data." Proceedings of the 47th Lunar and Planetary Science Conference, March 21-25, 2016, The Woodlands, Texas, U.S.A. Paper # 1484 [Full Text] [Proceedings]

2013. "Modeling and precise orbit determination in suport of gravity model development for the GRAIL mission." Spaceflight Mechanics 2013 (AAS/AIAA Spaceflight Mechanics Meeting, Feb. 10-14, 2013, Kauai, Hawaii), Advances in the Astronautical Sciences 148, Part II 1111-1123 [Proceedings]

2006. "Demonstration of an Interferometric Laser Ranging System for a Follow-On Gravity Mission to GRACE." 2006 IEEE International Symposium on Geoscience and Remote Sensing [10.1109/igarss.2006.288] [Proceedings]