Technical Note: A new discrete ordinate first-order rotational Raman scattering radiative transfer model – implementation and first results 1NILU-Norwegian Institute for Air Research, Kjeller, Norway
21 Oct 2011
2Meteorological Institute, Ludwig-Maximilians-University, Munich, Germany
3Division for Biomedical Physics, Innsbruck Medical University, Innsbruck, Austria
Received: 10 August 2010 – Published in Atmos. Chem. Phys. Discuss.: 01 October 2010 Abstract. 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.
Revised: 23 September 2011 – Accepted: 10 October 2011 – Published: 21 October 2011
Citation: Kylling, A., Mayer, B., and Blumthaler, M.: Technical Note: A new discrete ordinate first-order rotational Raman scattering radiative transfer model – implementation and first results, Atmos. Chem. Phys., 11, 10471-10485, doi:10.5194/acp-11-10471-2011, 2011.