Monte Carlo radiative transfer calculations for inhomogeneous mixed phase clouds.

Macke, Andreas, Mitchell, D. and von Bremen, Lüder (1999) Monte Carlo radiative transfer calculations for inhomogeneous mixed phase clouds. Physics and Chemistry of the Earth, 24 (3). pp. 237-241. DOI 10.1016/S1464-1909(98)00044-6.

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Albedo of three-dimensionally inhomogeneous mixed-phase clouds at visible wavelengths have been calculated by means of a Monte Carlo radiactive transfer model. The cloud physical properties, liquid water, ice, snow, and rain, have been obtained from the non-hydrostatic mesoscale atmospheric model GESIMA. Monte Carlo results are shown for a hierarchy of simplications in cloud geometry ranging from clouds with spatial variability of both optical thickness and microphysical properties to plane-parallel homogeneous clouds with prescribed microphysical properties. The results clearly demonstrate the albedo reduction due to cloud inhomogeneity compared to plane-parallel homogeneous water clouds (albedo bias). It is shown that the albedo bias is caused in about equal parts by internal cloud inhomogeneities and by horizontally finiteness of clouds. A detailed consideration of spatial variation in single scattering properties does not appear to be critical for realistic radiative transfer calculations.

Document Type: Article
Keywords: Monte Carlo radiative transfer model, inhomogeneous mixed-phase clouds
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: No
Open Access Journal?: No
DOI etc.: 10.1016/S1464-1909(98)00044-6
ISSN: 1474-7065
Date Deposited: 18 Feb 2008 17:24
Last Modified: 03 Jan 2017 09:18

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