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Simulation of the Earth's radiation budget by the European Centre for Medium-Range Weather
 

Summary: Simulation of the Earth's radiation budget by the
European Centre for Medium-Range Weather
Forecasts 40-year reanalysis (ERA40)
Richard P. Allan,1
Mark A. Ringer,2
J. Alison Pamment,3
and Anthony Slingo1
Received 25 March 2004; revised 16 June 2004; accepted 29 June 2004; published 18 September 2004.
[1] The radiation budget simulated by the European Centre for Medium-Range Weather
Forecasts (ECMWF) 40-year reanalysis (ERA40) is evaluated for the period 1979­2001
using independent satellite data and additional model data. This provides information
on the quality of the radiation products and indirect evaluation of other aspects of the
climate produced by ERA40. The climatology of clear-sky outgoing longwave radiation
(OLR) is well captured by ERA40. Underestimations of about 10 W mÀ2
in clear-sky
OLR over tropical convective regions by ERA40 compared to satellite data are
substantially reduced when the satellite sampling is taken into account. The climatology of
column-integrated water vapor is well simulated by ERA40 compared to satellite data over
the ocean, indicating that the simulation of downward clear-sky longwave fluxes at the
surface is likely to be good. Clear-sky absorbed solar radiation (ASR) and clear-sky OLR

  

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

 

Collections: Geosciences