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Theoretical and Applied Climatology

, Volume 47, Issue 2, pp 65–79 | Cite as

A hybrid technique for computing the monthly mean net longwave surface radiation over oceanic areas

  • H. Zhi
  • Harshvardhan
Article
  • 55 Downloads

Summary

Global maps of the monthly mean net upward longwave radiation flux at the ocean surface have been obtained for April, July, October 1985 and January 1986. These maps were produced by blending information obtained from a combination of general circulation model cloud radiative forcing fields, the top-of-the-atmosphere cloud radiative forcing from ERBE and TOVS profiles and sea surface temperature on ISCCP C1 tapes. The fields are compatible with known meteorological regimes of atmospheric water vapor content and cloudiness. There is a vast area of high net upward longwave radiation flux (> 80 W m−2) in the eastern Pacific Ocean throughout most of the year. Areas of low net upward longwave radiation flux (< 40 Wm−2) are the tropical convective regions and extra tropical regions that tend to have persistent low cloud cover. The technique used in this study relies on GCM simulations and so is subject to some of the uncertainties associated with the model. However, all input information regarding temperature, moisture and cloud cover is from satellite data having near global coverage. This feature of the procedure alone warrants its consideration for further use in compiling global maps of the net longwave radiation at the surface over the oceans.

Keywords

Cloud Cover Model Cloud Water Vapor Content Atmospheric Water Vapor Convective Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • H. Zhi
    • 1
  • Harshvardhan
    • 1
  1. 1.Department of Earth and Atmospheric SciencesPurdue UniversityWest LafayetteUSA

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