Bremen 2017 – scientific programme

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UP: Fachverband Umweltphysik

UP 14: Atmosphäre - Aerosole/Wolken

UP 14.2: Talk

Thursday, March 16, 2017, 15:00–15:15, GW2 B3009

Polarized inelastic scattering by ice clouds and dust aerosols for Sentinel-4 — •Luca Lelli, Vladimir Rozanov, Marco Vountas, and John Burrows — Institute of Environmental Physics and Remote Sensing, University of Bremen, Bremen, Germany

The quantification of rotational Raman scattering (RRS) and the filling in of the oxygen A-band (O2A) by inelastically scattered photons is investigated as it can be used for cloud, aerosol and greenhouse gas characterisation. We present simulation results using the radiative transfer model SCIATRAN. The vector version of SCIATRAN has been extended to account for the spectral effects of RRS in presence of aerosols and clouds.

Upon comparison with previous independent results published in the literature for Fraunhofer lines and O2A, results for the polarized, inelastic radiative transport are shown for various viewing geometries, instrumental specifications and geophysical scenarios. Specifically, bidirectional reflective effects induced by a polarizing surface are taken into account as well as scattering properties of asymmetric dust particles and ice crystals.

Seasonal maps of filling-in and degree of linear polarisation are shown for real viewing geometries of the upcoming geostationary Sentinel-4 mission, equipped with the payload UVN that covers the oxygen A-band at a nominal spectral resolution of 0.12 nm.