Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/tc-2017-168
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
18 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal The Cryosphere (TC).
Combined SMAP/SMOS Thin Sea Ice Thickness Retrieval
Cătălin Pațilea1, Georg Heygster1, Marcus Huntemann2,1, and Gunnar Spreen1 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
2Alfred Wegener Institute, Bremerhaven, Germany
Abstract. The spaceborne passive microwave sensors Soil Moisture Ocean Salinity (SMOS) and Soil Moisture Active Passive (SMAP) provide brightness temperature data at L-band (1.4 GHz). At this low frequency the atmosphere is close to transparent and in polar regions the thickness of thin sea ice can be derived. SMOS data covers a large incidence angle range whereas SMAP observes at a fixed 40° incidence angle which makes thin sea ice thickness retrieval more stable as incidence angle effects do not have to be taken into account. Here we transfer a retrieval algorithm for thickness of thin sea ice (up to 50 cm) from SMOS data at 40° to 50° incidence angle to the fixed incidence angle of SMAP. Now the SMOS brightness temperatures (TBs) at a given incidence angle are estimated using empirical fit functions. SMAP TBs are calibrated to SMOS for providing a merged SMOS/SMAP Sea Ice Thickness product.

Citation: Pațilea, C., Heygster, G., Huntemann, M., and Spreen, G.: Combined SMAP/SMOS Thin Sea Ice Thickness Retrieval, The Cryosphere Discuss., https://doi.org/10.5194/tc-2017-168, in review, 2017.
Cătălin Pațilea et al.
Cătălin Pațilea et al.
Cătălin Pațilea et al.

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Short summary
Sea ice thickness is important for representing atmosphere-ocean interactions in climate models. A validated satellite sea ice thickness measurements algorithm is transfered to a new sensor. The results offer a better temporal and spatial coverage of satellite measurements in the polar regions. Here we describe the calibration procedure between the two sensors taking into account their technical differences. In addition a new filter for interferences from artificial radio sources is implemented.
Sea ice thickness is important for representing atmosphere-ocean interactions in climate models....
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