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Can desert dust explain the outgoing longwave radiation anomaly over the Sahara during July 2003?
 

Summary: Can desert dust explain the outgoing longwave radiation anomaly over
the Sahara during July 2003?
Jim M. Haywood,1
Richard P. Allan,2
Ian Culverwell,1
Tony Slingo,2
Sean Milton,1
John Edwards,1
and Nicolas Clerbaux3
Received 14 July 2004; revised 21 October 2004; accepted 2 December 2004; published 9 March 2005.
[1] Measurements of the top-of-the-atmosphere outgoing longwave radiation (OLR) for
July 2003 from Meteosat-7 are used to assess the performance of the numerical weather
prediction version of the Met Office Unified Model. A significant difference is found over
desert regions of northern Africa where the model emits too much OLR by up to 35 Wm2
in
the monthly mean. By cloud-screening the data we find an error of up to 50 Wm2
associated
with cloud-free areas, which suggests an error in the model surface temperature, surface
emissivity, or atmospheric transmission. By building up a physical model of the radiative
properties of mineral dust based on in situ, and surface-based and satellite remote sensing

  

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

 

Collections: Geosciences