Paper Info
Title
The Impact of Geophysical Corrections on Sea-Ice Freeboard Retrieved from Satellite Altimetry.
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.
Year
DOI
Venue
2016
10.3390/rs8040317
REMOTE SENSING
Keywords
Field
DocType
Arctic sea ice,sea-ice thickness,remote sensing,radar altimetry,CryoSat-2
Sea ice,Hydrostatic equilibrium,Remote sensing,Sea-surface height,Sea ice thickness,Freeboard,Geology,Arctic ice pack,Climatology,Water level,Arctic,Geophysics
Journal
Volume
Issue
ISSN
8
4
2072-4292
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Robert Ricker101.01
Stefan Hendricks213.14
Justin Beckers311.83