Computer Science
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16r...5k&link_type=abstract
Advances in Space Research, Volume 16, Issue 10, p. 5-14.
Computer Science
Scientific paper
An overview is given on recent satellite methods to deduce absorption of solar energy and shortwave cloud forcing at the surface and within the atmosphere. The methods have been classified in three groups: regression between the net flux at the top of the atmosphere and at the surface, parameterized cloud cover, and radiative transfer calculations. Different aspects of these schemes have been analyzed, especially the ways how the cloud cover and the surface reflection have been treated. An overview has been given on the regions and time periods for which solar surface absorption and cloud forcing have been retrieved in different investigations from different satellite data (ERBE, ISCCP, Nimbus-7). The results obtained by different authors on regional, zonal, and global distributions of these quantities have been compared. Intercomparison of geographical distributions of solar surface absorption estimates shows a good qualitative agreement. Quantitatively, on a monthly basis differences of 30-40 Wm^-2 are possible. The same can be said about shortwave cloud forcing at the surface where regional differences in monthly values can reach 50 Wm^-2. These discrepancies are supposed to come mostly from differences in input satellite data.
Keevallik Sirje
Rannik Üllar
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