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Inconsistencies between satellite estimates of longwave cloud forcing and dynamical fields from reanalyses
 

Summary: Inconsistencies between satellite estimates of longwave cloud forcing
and dynamical fields from reanalyses
Richard P. Allan1
and Mark A. Ringer
Hadley Centre, Met Office, Bracknell, Berkshire, UK
Received 30 January 2003; revised 15 April 2003; accepted 17 April 2003; published 15 May 2003.
[1] The greenhouse effect of cloud may be quantified as the
difference between outgoing longwave radiation (OLR) and
its clear-sky component (OLRc). Clear-sky measurements
from satellite preferentially sample drier, more stable con-
ditions relative to the monthly-mean state. The resulting
observational bias is evident when OLRc is stratified by
vertical motion; differences to climate model OLRc of
15 Wm2
occur over warm regions of strong ascent. Using
data from the ECMWF 40-year reanalysis, an estimate of
cloud longwave radiative effect is made which is directly
comparable with standard climate model diagnostics. The
impact of this methodology on the cancellation of cloud
longwave and shortwave radiative forcing in the tropics is

  

Source: Allan, Richard P. - Department of Meteorology, University of Reading

 

Collections: Geosciences