Mon Dec 15, F. Flechtner
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Long, Qing and Su, Xiaoli, 2025. Assessing the Consistency Among Three Mascon Solutions and COST-G-Based Grid Products for Characterizing Antarctic Ice Sheet Mass Change. Remote Sensing, 17(22):3699, doi:10.3390/rs17223699.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025RemS...17.3699L,
author = {{Long}, Qing and {Su}, Xiaoli},
title = "{Assessing the Consistency Among Three Mascon Solutions and COST-G-Based Grid Products for Characterizing Antarctic Ice Sheet Mass Change}",
journal = {Remote Sensing},
keywords = {the Antarctic ice sheet, mass variation, mascon data, grid product, GRACE/GRACE-FO},
year = 2025,
month = nov,
volume = {17},
number = {22},
eid = {3699},
pages = {3699},
abstract = "{What are the main findings? The three mainstream mascon as well as COST-
G-based grids show good consistency over the AIS, while large
differences occurred in APIS. Significant differences among
these four grids existed in the annual mass change in 2016 and
the interannual signals from mid-2016 to mid-2018. The three
mainstream mascon as well as COST-G-based grids show good
consistency over the AIS, while large differences occurred in
APIS. Significant differences among these four grids existed in
the annual mass change in 2016 and the interannual signals from
mid-2016 to mid-2018. What are the implications of the main
findings? One or more mascon or COST-G-based grids can be
selected for application to perform further studies over the
AIS. Caution should be taken when applying these grids over the
APIS. This study sheds light on the way to improve the quality
of GRACE/GRACE-FO grid products; i.e., refining the algorithms
for the APIS and updating the grids at the late stage of the
GRACE mission. One or more mascon or COST-G-based grids can be
selected for application to perform further studies over the
AIS. Caution should be taken when applying these grids over the
APIS. This study sheds light on the way to improve the quality
of GRACE/GRACE-FO grid products; i.e., refining the algorithms
for the APIS and updating the grids at the late stage of the
GRACE mission. To facilitate easy accessibility to the Gravity
Recovery and Climate Experiment (GRACE) and GRACE Follow-On
(GRACE-FO) results for the geoscientific community, multiple
institutions have successively developed mass anomaly grid
products including mass concentration (mascon) grids; these were
provided at the Gravity Information Service (GravIS) portal.
However, an assessment of their consistency for studying large-
scale mass redistribution and transport in Earth's system is
still not available. Here, we compare three major mascon
solutions separately from the Center for Space Research (CSR),
the Jet Propulsion Laboratory (JPL), the Goddard Space Flight
Center (GSFC) and GravIS products based on the Combination
Service for Time-variable Gravity fields (COST-G) by analyzing
the Antarctic Ice Sheet (AIS) mass changes in four aspects. Our
results demonstrate that: (1) the four datasets exhibit strong
consistency on the entire AIS mass change time series, with the
largest difference occurring in the Antarctic Peninsula; (2)
mass trend estimates show better agreement over longer periods
and larger regions, but differences with a percentage of 20─40
exist during the late stage of GRACE and the whole GRACE-FO
timespan; (3) notable discrepancies arise in the annual
statistics of the Eastern AIS in 2016, leading to inconsistency
on the sign of annual AIS mass change; (4) good agreement can be
seen among these interannual mass variations over the AIS and
its three subregions during 2003─2023, excluding the period from
mid-2016 to mid-2018. These findings may provide key insights
into improving algorithms for mascon solutions and grid products
towards refining their applications in ice mass balance studies.}",
doi = {10.3390/rs17223699},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025RemS...17.3699L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Dec 15, F. Flechtner