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Diagnostic analysis of atmospheric moisture and clear-sky radiative feedback in the Hadley
 

Summary: Diagnostic analysis of atmospheric moisture
and clear-sky radiative feedback in the Hadley
Centre and Geophysical Fluid Dynamics
Laboratory (GFDL) climate models
Richard P. Allan
Hadley Centre, Met Office, Bracknell, UK
V. Ramaswamy
Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, New Jersey, USA
A. Slingo1
Hadley Centre, Met Office, Bracknell, UK
Received 23 July 2001; revised 20 December 2001; accepted 26 December 2001; published 11 September 2002.
[1] The interannual variability of the hydrological cycle is diagnosed from the Hadley
Centre and Geophysical Fluid Dynamics Laboratory (GFDL) climate models, both of
which are forced by observed sea surface temperatures. The models produce a similar
sensitivity of clear-sky outgoing longwave radiation to surface temperature of $2 W mĀ2
KĀ1
, indicating a consistent and positive clear-sky radiative feedback. However,
differences between changes in the temperature lapse-rate and the height dependence of
moisture fluctuations suggest that contrasting mechanisms bring about this result. The
GFDL model appears to give a weaker water vapor feedback (i.e., changes in specific

  

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

 

Collections: Geosciences