Separating Geophysical Signals Using GRACE and High-Resolution Data: A Case Study in Antarctica

To fully exploit data from the Gravity Recovery and Climate Experiment (GRACE), we separate geophysical signals observed by GRACE in Antarctica by deriving high-spatial resolution maps for present-day glacial isostatic adjustment (GIA) and ice-mass changes with the least possible noise level. For th...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Engels, Olga (author), Gunter, B.C. (author), Riva, R.E.M. (author), Klees, R. (author)
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
Antarctica
data-driven approach
GIA
GRACE post-processing
high spatial resolution
ice mass changes
Amundsen Sea
Antarc*
Kamb Ice Stream
Online Access:http://resolver.tudelft.nl/uuid:be1dc9c7-6aac-477b-b22d-e95c2cbeb01f
https://doi.org/10.1029/2018GL079670
Description
Summary:To fully exploit data from the Gravity Recovery and Climate Experiment (GRACE), we separate geophysical signals observed by GRACE in Antarctica by deriving high-spatial resolution maps for present-day glacial isostatic adjustment (GIA) and ice-mass changes with the least possible noise level. For this, we simultaneously (i) improve the postprocessing of gravity data and (ii) consistently combine them with high-resolution data from Ice Cloud and land Elevation Satellite altimeter (ICESat) and Regional Atmospheric Climate Model 2.3 (RACMO). We use GPS observations to discriminate between various candidate spatial patterns of vertical motions caused by GIA. The ICESat-RACMO combination determines the spatial resolution of estimated ice-mass changes. The results suggest the capability of the developed approach to retrieve the complex spatial pattern of present-day GIA, such as a pronounced subsidence in the proximity of the Kamb Ice Stream and pronounced uplift in the Amundsen Sea Sector. Physical and Space Geodesy

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