ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-10471-2011 Technical Note: A new discrete ordinate first-order rotational Raman scattering radiative transfer model – implementation and first results Kylling A. 1 Mayer B. 2 Blumthaler M. 3 NILU-Norwegian Institute for Air Research, Kjeller, Norway Meteorological Institute, Ludwig-Maximilians-University, Munich, Germany Division for Biomedical Physics, Innsbruck Medical University, Innsbruck, Austria 21 10 2011 11 20 10471 10485 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/10471/2011/acp-11-10471-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/10471/2011/acp-11-10471-2011.pdf

Rotational Raman scattering in the Earth's atmosphere explains the filling-in of Fraunhofer lines in the solar spectrum. A new model including first-order rotational Raman scattering has been developed, based on a reimplementation of the versatile discrete ordinate radiative transfer (DISORT) solver in the C computer language. The solver is fully integrated in the freely available libRadtran radiative transfer package. A detailed description is given of the model including the spectral resolution and a spectral interpolation scheme that considerably speeds up the calculations. The model is used to demonstrate the effect of clouds on top and bottom of the atmosphere filling-in factors and differential optical depths. Cloud effects on vertical profiles of the filling-in factor are also presented. The spectral behaviour of the model is compared against measurements under thunderstorm and aerosol loaded conditions.

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