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A decade of West Antarctic subglacial lake interactions from combined ICESat and CryoSat‐2 altimetry
Author(s) -
Siegfried Matthew R.,
Fricker Helen A.,
Roberts Mackenzie,
Scambos Ted A.,
Tulaczyk Slawek
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2013gl058616
Subject(s) - elevation (ballistics) , altimeter , geology , satellite , global positioning system , glacier , remote sensing , ice sheet , geodesy , climatology , geomorphology , telecommunications , geometry , computer science , engineering , aerospace engineering , mathematics
We use CryoSat‐2 interferometric satellite radar altimetry over the Mercer and Whillans ice streams, West Antarctica, to derive surface elevation changes due to subglacial lake activity at monthly resolution for the period 2010 to 2013. We validate CryoSat‐2 elevation measurements, trends, and spatial patterns of change using satellite image differencing and in situ vertical movement from Global Positioning System (GPS) data. Two subglacial lake discharge events occur in the same subglacial‐hydrological catchment within a 9 month period. Using GPS measurements that are spanning the gap between the Ice, Cloud, and land Elevation Satellite and Cryosat‐2 missions, we cross‐calibrate the two missions to establish the efficacy of CryoSat‐2 altimetry to measure dynamic changes on the ice sheets.