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ERS‐1 altimetry on the Greenland Ice Sheet: Preliminary investigations of annual variations
Author(s) -
Andersen Ole Baltazar
Publication year - 1994
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 - 10.1029/94gl01356
Subject(s) - greenland ice sheet , geology , ice sheet , amplitude , altimeter , geodesy , groenlandia , signal (programming language) , elevation (ballistics) , climatology , remote sensing , geomorphology , physics , optics , astronomy , computer science , programming language
The existence of an annual signal in the ERS‐1 35‐day repeat altimetry measurements over the Greenland ice sheet is investigated in this paper. Spectral analysis from a collinear set of long tracks indicates, that the timevarying part of the elevation signal is rather constant at a level around 20 cm at frequencies higher than 1 cycle per degree. At lower frequencies the presence of a stationary signal can be seen. This signal can be estimated in a collinear analysis from the entire set of 35‐day altimetry data over the ice sheet spanning one and a half years. Separation of an annual signal revealed a signal highly correlated with topography. The mean amplitude is around 40 cm, with amplitudes between 10–20 cm around the summit of the ice, rising to between 50–80 cm approaching the ablation zone of the ice sheet.