A strict test in climate modeling with spectrally resolved radiances: GCM simulation versus AIRS observations

Yi Huang, V. Ramaswamy, Xianglei Huang, Qiang Fu, Charles Bardeen

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

The spectrally resolved infrared radiances observed by AIRS provide a strict and insightfal test for general circulation models (GCMs). We compare the clear- and total-sky spectra simulated from the Geophysical Fluid Dynamics Laboratory GCM using a high resolution radiation code with the AIRS observations. After ensuring consistency in the sampling of the observed and simulated spectra and a proper representation of clouds in the radiance simulation, the observed and simulated global-mean radiances are shown to agree to within 2 K in the window region. Radiance discrepancies in the water vapor v2 (1300-1650 cm-1) and carbon dioxide v2 (650-720 cm-1) bands are consistent with the model biases in atmospheric temperature and water vapor. The existence of radiance biases of opposite signs in different spectral regions suggests that a seemingly good agreement of the model's broadband longwave flux with observations may be due to a fortuitous cancellation of spectral errors. Moreover, an examination of the diurnal difference spectrum indicates pronounced biases in the model-simulated diurnal hydrologic cycle over the tropical oceans, a feature seen to occur in other GCMs as well.

Original languageEnglish (US)
Article numberL24707
JournalGeophysical Research Letters
Volume34
Issue number24
DOIs
StatePublished - Dec 28 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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