Bremen 2017 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 5: Postersession

UP 5.22: Poster

Dienstag, 14. März 2017, 16:40–18:10, GW2 B3010

Combining L-band sensor data for thin sea ice thickness retrieval — •Catalin Patilea, Georg Heygster, Marcus Huntemann, and Justus Notholt — University of Bremen, Institute of Environmental Physics, Bremen, Germany

Thin sea ice thickness retrieval has been developed for the L-band radiometer Soil Moisture Ocean Salinity (SMOS) using daily means of high incidence angle (40-50°) data. The algorithm uses the correlation between brightness temperature intensity and polarization difference for retrieving sea ice thickness up to 0.5 m.

Fit functions for the dependence of the horizontal and vertical polarized brightness temperatures (Tbs) on incidence angle have been used for each SMOS grid point and day so that Tbs for any incidence angle can be extracted. This avoids daily introduction of a bias by the averaging process and it replaces the Radio Frequency Interference (RFI) filter used formerly which removed the whole snapshot if it contained one data point over 300 K which resulted in large areas with no data.

The L-band conically scanning radiometer Soil Moisture Active Passive (SMAP) has satellite level RFI filtering yielding a more complete coverage. A combined product is developed regressing SMAP Tbs to those of SMOS at 40° incidence angle. The combined sea ice thickness data has a better daily coverage and less noise.