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QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY Q. J. R. Meteorol. Soc. 133: 19932010 (2007)
 

Summary: QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
Q. J. R. Meteorol. Soc. 133: 1993­2010 (2007)
Published online in Wiley InterScience
(www.interscience.wiley.com) DOI: 10.1002/qj.166
Evaluation of the Met Office global forecast model using
Geostationary Earth Radiation Budget (GERB) data
Richard P. Allan,a* Anthony Slingo,a Sean F. Miltonb and Malcolm E. Brooksb
a Environmental Systems Science Centre, University of Reading, Reading, UK
b Met Office, Exeter, UK
ABSTRACT: Simulations of the top-of-atmosphere radiative-energy budget from the Met Office global numerical weather-
prediction model are evaluated using new data from the Geostationary Earth Radiation Budget (GERB) instrument on board
the Meteosat-8 satellite. Systematic discrepancies between the model simulations and GERB measurements greater than
20 Wm-2
in outgoing long-wave radiation (OLR) and greater than 60 Wm-2
in reflected short-wave radiation (RSR) are
identified over the period April­September 2006 using 12 UTC data. Convective cloud over equatorial Africa is spatially
less organized and less reflective than in the GERB data. This bias depends strongly on convective-cloud cover, which is
highly sensitive to changes in the model convective parametrization. Underestimates in model OLR over the Gulf of Guinea
coincide with unrealistic southerly cloud outflow from convective centres to the north. Large overestimates in model RSR
over the subtropical ocean, greater than 50 Wm-2

  

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

 

Collections: Geosciences