Estimating snow depth over Arctic sea ice from calibrated dual-frequency radar freeboards
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Published:2018-11-13
Issue:11
Volume:12
Page:3551-3564
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Lawrence Isobel R., Tsamados Michel C., Stroeve Julienne C., Armitage Thomas W. K.ORCID, Ridout Andy L.
Abstract
Abstract. Snow depth on sea ice
remains one of the largest uncertainties in sea ice thickness retrievals from
satellite altimetry. Here we outline an approach for deriving snow depth that
can be applied to any coincident freeboard measurements after calibration
with independent observations of snow and ice freeboard. Freeboard estimates
from CryoSat-2 (Ku band) and AltiKa (Ka band) are calibrated against data
from NASA's Operation IceBridge (OIB) to align AltiKa with the snow surface
and CryoSat-2 with the ice–snow interface. Snow depth is found as the
difference between the two calibrated freeboards, with a correction added for
the slower speed of light propagation through snow. We perform an initial
evaluation of our derived snow depth product against OIB snow depth data by
excluding successive years of OIB data from the analysis. We find a
root-mean-square deviation of 7.7, 5.3, 5.9, and 6.7 cm between our
snow thickness product and OIB data from the springs of 2013, 2014, 2015, and
2016 respectively. We further demonstrate the applicability of the method to
ICESat and Envisat, offering promising potential for the application to
CryoSat-2 and ICESat-2, which launched in September 2018.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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