Thu Apr 10, F. Flechtner
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Sasgen, Ingo, Konrad, Hannes, Helm, Veit, and Grosfeld, Klaus, 2019. High-Resolution Mass Trends of the Antarctic Ice Sheet through a Spectral Combination of Satellite Gravimetry and Radar Altimetry Observations. Remote Sensing, 11(2):144, doi:10.3390/rs11020144.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2019RemS...11..144S,
author = {{Sasgen}, Ingo and {Konrad}, Hannes and {Helm}, Veit and {Grosfeld}, Klaus},
title = "{High-Resolution Mass Trends of the Antarctic Ice Sheet through a Spectral Combination of Satellite Gravimetry and Radar Altimetry Observations}",
journal = {Remote Sensing},
keywords = {Mass balance, Ice Sheets, Sea-level Rise, Antarctica, GRACE, CryoSat-2, GRACE-Follow On, GRACE-FO, downward continuation, spectral methods},
year = 2019,
month = jan,
volume = {11},
number = {2},
eid = {144},
pages = {144},
abstract = "{Time-variable gravity measurements from the Gravity Recovery and Climate
Experiment (GRACE) and GRACE-Follow On (GRACE-FO) missions and
satellite altimetry measurements from CryoSat-2 enable
independent mass balance estimates of the Earth's glaciers and
ice sheets. Both approaches vary in terms of their retrieval
principles and signal-to-noise characteristics. GRACE/GRACE-FO
recovers the gravity disturbance caused by changes in the mass
of the entire ice sheet with a spatial resolution of 300 to 400
km. In contrast, CryoSat-2measures travel times of a radar
signal reflected close to the ice sheet surface, allowing
changes of the surface topography to be determined with about 5
km spatial resolution. Here, we present a method to combine
observations from the both sensors, taking into account the
different signal and noise characteristics of each satellite
observation that are dependent on the spatial wavelength. We
include uncertainties introduced by the processing and
corrections, such as the choice of the re-tracking algorithm and
the snow/ice volume density model for CryoSat-2, or the
filtering of correlated errors and the correction for glacial-
isostatic adjustment (GIA) for GRACE. We apply our method to the
Antarctic ice sheet and the time period 2011-2017, in which
GRACE and CryoSat-2 were simultaneously operational, obtaining a
total ice mass loss of 178 {\ensuremath{\pm}} 23 Gt yr$^{-1}$.
We present a map of the rate of mass change with a spatial
resolution of 40 km that is evaluable across all spatial scales,
and more precise than estimates based on a single satellite
mission.}",
doi = {10.3390/rs11020144},
adsurl = {https://ui.adsabs.harvard.edu/abs/2019RemS...11..144S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Thu Apr 10, F. Flechtner