Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2165w&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2165-2168
Physics
9
Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Theoretical Modeling
Scientific paper
Large uncertainties exist in the distribution of solar radiation in the global climate system and its representation in General Circulation Models (GCMs). The present paper assesses the transmission of solar radiation through cloud-free atmosphere in three GCMs using information from direct observations at the surface. Clear-sky insolation climatologies have been constructed from hourly radiation data through composites of clear-sky episodes for seven sites in Germany with ten years of accurate measurements. The results suggest that GCMs overestimate clear-sky insolation at the surface, indicating that the cloud-free atmosphere is overly transparent to solar radiation in the models. Quantitatively, the annual mean overestimation for the German sites is on the order of 10 Wm-2 in the models which include an aerosol climatology and 30 Wm-2 in the models without aerosol. The GCM-predicted atmospheric water vapor content is abundant compared to the ECMWF Re-Analysis and therefore not considered responsible for the missing absorption in the model atmosphere. Rather, underestimated water vapor absorption in the GCM radiation codes is implied.
Liepert Beate
Wild Martin
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