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Transport of infrared radiation in cuboidal cloudsThe transport of infrared radiation in a single cuboidal cloud is modeled using a variable azimuth two-stream approximation. Computations are made at 10 microns for a Deirmendjian (1969) C-1 water cloud where the single scattering albedo is equal to 0.638 and the asymmetry parameter is 0.865. The results indicate that the emittance of the top face of the model cloud is always less than that for a plane parallel cloud of the same optical depth. The hemispheric flux escaping from the cloud top possesses a gradient from the center to the edges which are warmer when the cloud is over warmer ground. Cooling rate calculations in the 8-13.6 micron region demonstrate that there is cooling out of the sides of the cloud at all levels even when there is heating of the core from the ground below. The radiances exiting from model cuboidal clouds are computed by path integration over the source function obtained with the two-stream approximation. Results indicate that the brightness temperature measured from finite clouds will overestimate the cloud-top temperature.
Document ID
19820035835
Document Type
Reprint (Version printed in journal)
Authors
Harshvardhan, MR. (NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt; Maryland, University, College Park, MD, United States)
Weinman, J. A. (NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt, MD; Wisconsin, University, Madison, WI, United States)
Davies, R. (Wisconsin, University Madison, WI, United States)
Date Acquired
August 10, 2013
Publication Date
November 1, 1981
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 38
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NAG5-101
CONTRACT_GRANT: NSG-5209
Distribution Limits
Public
Copyright
Other