Upper tropospheric relative humidity from the GOES 6.7 μm channel: method and climatology for July 1987

B. J. Soden, F. P. Bretherton

Research output: Contribution to journalArticle

210 Scopus citations

Abstract

The 6.7-μm channel is located near the center of a strong water vapor absorption band and under clear sky conditions is primarily sensitive to the relative humidity averaged over a depth of atmosphere extending from 200 to 500 mbar. Estimates of the clear sky radiance at 6.7-μm are obtained by utilizing the local spatial structure of the radiance field at 11-μm and the correlation between 11-μm and 6.7-μm, to discriminate between clear and cloudy pixels. This approach is demonstrated to be more reliable than cloud clearance based solely upon the local spatial structure of the 6.7-μm channel alone and provides estimates of the clear sky 6.7-μm brightness temperature for areas 2° × 2° of latitude and longitude which are repeatable from successive images 30 min apart to within approximately 1 K. To facilitate the interpretation of the clear sky brightness temperatures, a simplified model of the radiative transfer at 6.7-μm is presented. -from Authors

Original languageEnglish (US)
Pages (from-to)16,669-16,688
JournalJournal of Geophysical Research
Volume98
Issue numberD9
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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