Bremen 2017 – scientific programme
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UP: Fachverband Umweltphysik
UP 16: Andere Themen
UP 16.3: Talk
Thursday, March 16, 2017, 17:15–17:30, GW2 B3009
Influence of varying opening angle and spectral bandwidth on bidirectional reflectance factors — •Christine Pohl1, Larysa Istomina1, Evelyn Jäkel2, and Georg Heygster1 — 1Institute of Environmental Physics, University of Bremen — 2Institute of Meteorology, University of Leipzig
The albedo of snow covered Arctic ice plays an important role for the Arctic amplification of the global warming. To derive the albedo from observations, the distribution of bidirectional reflectance factors (BRFs) are measured by airborne or satellite instruments which offer amongst others different fields of view (FOVs) and different spectral bandwidths. The diversity in these sensor specifications introduces an uncertainty in the comparison of ground truth and satellite and airborne BRFs, respectively, and accordingly in the derivation of the albedo. The influence of different FOVs and different spectral bandwidths on the BRF are analyzed. Snow BRFs are simulated by the radiative transfer model SCIATRAN in a standard Arctic atmosphere at 75°N under a solar zenith angle of 55°. The dependence of the BRF on the FOV and on the spectral bandwidth of the sensor will be presented, respectively, and will allow to estimate the errors of the different observation techniques.