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Observations of the diurnal cycle of outgoing longwave radiation from the Geostationary Earth Radiation Budget instrument
 

Summary: Observations of the diurnal cycle of outgoing longwave radiation from
the Geostationary Earth Radiation Budget instrument
Ruth E. Comer,1
Anthony Slingo,1
and Richard P. Allan1
Received 20 September 2006; revised 7 November 2006; accepted 21 December 2006; published 30 January 2007.
[1] The Geostationary Earth Radiation Budget instrument
on Meteosat-8, located over Africa, provides unprecedented
temporal sampling ($17 minutes) of the broadband emitted
thermal and reflected solar radiances. We analyse the
diurnal cycle of the outgoing longwave radiation (OLR)
fluxes derived from the thermal radiances for July 2006.
Principal component (PC) analysis separates the signals of
the surface temperature response to solar heating and of the
development of convective clouds. The first two PCs
explain most of the OLR variations: PC1 (surface heating)
explains 82.3% of the total variance and PC2 (cloud
development) explains 12.8% of the variance. Convection is
initiated preferentially over mountainous regions and the
cloud then advects downstream in the ambient flow. Diurnal

  

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

 

Collections: Geosciences