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Remote Sens. 2016, 8(4), 317; doi:10.3390/rs8040317

The Impact of Geophysical Corrections on Sea-Ice Freeboard Retrieved from Satellite Altimetry

1
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Bussestrasse 24, 27570 Bremerhaven, Germany
2
Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2R3, Canada
*
Author to whom correspondence should be addressed.
Academic Editors: Walt Meier, Mark Tschudi, Richard Gloaguen and Prasad S. Thenkabail
Received: 27 February 2016 / Revised: 22 March 2016 / Accepted: 31 March 2016 / Published: 9 April 2016
(This article belongs to the Special Issue Sea Ice Remote Sensing and Analysis)
View Full-Text   |   Download PDF [10206 KB, uploaded 9 April 2016]   |  

Abstract

Satellite altimetry is the only method to monitor global changes in sea-ice thickness and volume over decades. Such missions (e.g., ERS, Envisat, ICESat, CryoSat-2) are based on the conversion of freeboard into thickness by assuming hydrostatic equilibrium. Freeboard, the height of the ice above the water level, is therefore a crucial parameter. Freeboard is a relative quantity, computed by subtracting the instantaneous sea surface height from the sea-ice surface elevations. Hence, the impact of geophysical range corrections depends on the performance of the interpolation between subsequent leads to retrieve the sea surface height, and the magnitude of the correction. In this study, we investigate this impact by considering CryoSat-2 sea-ice freeboard retrievals in autumn and spring. Our findings show that major parts of the Arctic are not noticeably affected by the corrections. However, we find areas with very low lead density like the multiyear ice north of Canada, and landfast ice zones, where the impact can be substantial. In March 2015, 7.17% and 2.69% of all valid CryoSat-2 freeboard grid cells are affected by the ocean tides and the inverse barometric correction by more than 1 cm. They represent by far the major contributions among the impacts of the individual corrections. View Full-Text
Keywords: Arctic sea ice; sea-ice thickness; remote sensing; radar altimetry; CryoSat-2 Arctic sea ice; sea-ice thickness; remote sensing; radar altimetry; CryoSat-2
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ricker, R.; Hendricks, S.; Beckers, J.F. The Impact of Geophysical Corrections on Sea-Ice Freeboard Retrieved from Satellite Altimetry. Remote Sens. 2016, 8, 317.

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