Thu Apr 10, F. Flechtner
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Sanchez Lofficial, Ana, Métivier, Laurent, Fleitout, Luce, Chanard, Kristel, Greff-Lefftz, Marianne, de La Serve, Maylis, Gauer, Louis-Marie, and Gourrion, Emma, 2025. Multi-technique estimation of ice mass balance in Greenland: impact of the uncertainties on firn densification and GIA models. Geophysical Journal International, 240(3):1935–1952, doi:10.1093/gji/ggaf015.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025GeoJI.240.1935S,
author = {{Sanchez Lofficial}, Ana and {M{\'e}tivier}, Laurent and {Fleitout}, Luce and {Chanard}, Kristel and {Greff-Lefftz}, Marianne and {de La Serve}, Maylis and {Gauer}, Louis-Marie and {Gourrion}, Emma},
title = "{Multi-technique estimation of ice mass balance in Greenland: impact of the uncertainties on firn densification and GIA models}",
journal = {Geophysical Journal International},
year = 2025,
month = mar,
volume = {240},
number = {3},
pages = {1935-1952},
abstract = "{We conduct a comprehensive comparison of ice mass balance (IMB)
estimates for Greenland derived from satellite observations of
ice surface elevation changes (SEC), gravity and global
navigation satellite system (GNSS) observations. Our analysis
integrates data from the ICESat and CryoSat-2 satellite
altimetry missions, augmented by optical stereo-imagery for
peripheral glaciers, and GRACE satellite gravimetry mission,
spanning the 2003-2008 and 2011-2015 periods. We also consider
three firn densification models (FDM) and five glacial isostatic
adjustment (GIA) models for correcting the data sets for these
effects when necessary. Our results reveal significant
differences among FDM corrections applied to SEC observations,
with particularly large variations in IMB estimates reaching up
to 90 Gt yr$^{-1}$. To address this, we develop an innovative
method for estimating equivalent firn corrections to the ice
elevation observations, based on a least-squares fit of filtered
ice SEC observations to GRACE mass-change estimates. This
approach is both simple and independent from climate models
assumptions and shows minimal sensitivity to GIA model
differences. Using this method, we estimate IMBs for Greenland
at -217.6 <inline-formula><tex-math id=``TM0001''
notation=``LaTeX''>$\pm$</tex-math></inline-formula> 15.7 Gt
yr$^{-1}$ for 2003-2008 and -253.2 <inline-formula><tex-math
id=``TM0002'' notation=``LaTeX''>$\pm$</tex-math></inline-
formula> 18.8 Gt yr$^{-1}$ for 2011-2015. Importantly, these
values indicate an acceleration of the thinning rate, not
consistently captured by the IMB estimates inferred from the ice
SEC observations corrected by FDMs. Finally, we compute elastic
ground deformation induced by ice mass change during 2011-2015,
using the four proposed mass-variation distributions and compare
the predicted vertical velocities with GNSS observations in
Greenland, accounting for all GIA models. While all models are
consistent with most of the GNSS-derived uplift rates, they
cannot fully explain the observed vertical velocities,
especially in the South-East Greenland, which confirms the need
to refine our understanding of GIA contributions in this region.}",
doi = {10.1093/gji/ggaf015},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025GeoJI.240.1935S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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