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Comparison of the observed and calculated clear sky greenhouse effect - Implications for climate studiesThe clear sky greenhouse effect is defined in terms of the outgoing longwave clear sky flux at the top of the atmosphere. Recently, interest in the magnitude of the clear sky greenhouse effect has increased due to the archiving of the clear sky flux quantity through the Earth Radiation Budget Experiment (ERBE). The present study investigates to what degree of accuracy this flux can be analyzed by using independent atmospheric and surface data in conjunction with a detailed longwave radiation model. The conclusion from this comparison is that for most regions over oceans the analyzed fluxes agree to within the accuracy of the ERBE-retrieved fluxes (+/- 5 W/sq m). However, in regions where deep convective activity occurs, the ERBE fluxes are significantly higher (10-15 W/sq m) than the calculated fluxes. This bias can arise from either cloud contamination problems or variability in water vapor amount. It is argued that the use of analyzed fluxes may provide a more consistent clear sky flux data set for general circulation modeling validation. Climate implications from the analyzed fluxes are explored. Finally, results for obtaining longwave surface fluxes over the oceans are presented.
Document ID
19920063172
Document Type
Reprint (Version printed in journal)
Authors
Kiehl, J. T. (NASA Headquarters Washington, DC United States)
Briegleb, B. P. (NCAR Boulder, CO, United States)
Date Acquired
August 15, 2013
Publication Date
June 20, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D9 J
ISSN: 0148-0227
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-17661
Distribution Limits
Public
Copyright
Other