Cirrus horizontal inhomogeneity and OLR bias

Details Cirrus horizontal inhomogeneity and OLR bias Cirrus horizontal inhomogeneity and OLR bias

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3341f&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 20, p. 3341-3344

Physics

23

Atmospheric Composition And Structure, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

The outgoing longwave radiation (OLR) bias due to the neglect of cloud horizontal inhomogeneities has been examined in this study. It is argued that this OLR bias is most significant for semi-transparent cirrus clouds that are located in the cold upper troposphere. Using two cirrus cases observed from cloud radar, it is found that the OLR biases due to the plane-parallel homogeneous assumption are ~14 Wm-2. These biases are largely caused by the horizontal variation of cloud optical depth. It is also shown that in general the OLR biases are strongly dependent on the cloud height and mean and standard deviation of cloud optical depth. We have demonstrated that the gamma-weighted radiative transfer scheme, which is efficient for GCM applications, can be used to account for the effect of cloud horizontal inhomogeneity on the infrared fluxes.

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