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Land surface skin temperatures from a combined analysis of microwave and infrared satellite observations for an all-weather
 

Summary: Land surface skin temperatures from a combined analysis of
microwave and infrared satellite observations for an all-weather
evaluation of the differences between air and skin temperatures
Catherine Prigent
CNRS, LERMA, Observatoire de Paris, France
Filipe Aires1
and William B. Rossow
NASA Goddard Institute for Space Studies, New York, New York, USA
Received 14 March 2002; revised 20 January 2003; accepted 6 February 2003; published 24 May 2003.
[1] A neural network inversion scheme including first guess information has been
developed to retrieve surface temperature Ts, along with atmospheric water vapor, cloud
liquid water, and surface emissivities over land from a combined analysis of Special
Sensor Microwave/Imager (SSM/I) and International Satellite Cloud Climatology Project
(ISCCP) data. In the absence of routine in situ surface skin measurements, retrieved Ts
values are evaluated by comparison to the surface air temperature Tair measured by the
meteorological station network. The Ts └ Tair difference shows all the expected variations
with solar flux, soil characteristics, and cloudiness. During daytime the Ts └ Tair difference
is driven by the solar insulation, with positive differences that increase with increasing
solar flux. With decreasing soil and vegetation moisture the evaporation rate decreases,
increasing the sensible heat flux, thus requiring larger Ts └ Tair differences. Nighttime Ts └

  

Source: Aires, Filipe - Laboratoire de MÚtÚorologie Dynamique du CNRS, UniversitÚ Pierre-et-Marie-Curie, Paris 6
Fridlind, Ann - Earth Science Division, NASA Ames Research Center

 

Collections: Environmental Sciences and Ecology; Geosciences