Articles | Volume 11, issue 20
Atmos. Chem. Phys., 11, 10471–10485, 2011
Atmos. Chem. Phys., 11, 10471–10485, 2011

Technical note 21 Oct 2011

Technical note | 21 Oct 2011

Technical Note: A new discrete ordinate first-order rotational Raman scattering radiative transfer model – implementation and first results

A. Kylling1, B. Mayer2, and M. Blumthaler3 A. Kylling et al.
  • 1NILU-Norwegian Institute for Air Research, Kjeller, Norway
  • 2Meteorological Institute, Ludwig-Maximilians-University, Munich, Germany
  • 3Division for Biomedical Physics, Innsbruck Medical University, Innsbruck, Austria

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.

Final-revised paper