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Coastal sea level from inland CryoSat‐2 interferometric SAR altimetry
Author(s) -
Abulaitijiang Adili,
Andersen Ole Baltazar,
Stenseng Lars
Publication year - 2015
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 - 10.1002/2015gl063131
Subject(s) - altimeter , footprint , remote sensing , geodesy , satellite , geology , synthetic aperture radar , fjord , radar altimeter , elevation (ballistics) , interferometry , environmental science , oceanography , physics , astronomy , paleontology
The European Space Agency's CryoSat‐2 satellite can operate in a novel synthetic aperture radar interferometric (SARIn) mode where its nominal footprint (swath) is observed by two antennas and the phase difference between the signals is used to determination the exact location of the scatterer through an off‐nadir correction. The potential of SARIn for sea level determination is investigated over the fjords of Eastern Greenland. In principle the satellite should only track sea level within its nominal footprint of 7 km across track, but we observe that scattering targets (fjords) within twice its nominal footprint are frequently observed but mislocated in CryoSat‐2 due to phase wrapping. We devised a way to relocate the observations and correct the range accordingly. When CryoSat‐2 is flying inland we consequently observed that the satellite occasionally provide valid sea level in fjords up to 13 km away in the across‐track direction.