The Estimation of Clear Sky Emission Values from Cloudy Radiometric Data.

This report determines the effects of clouds on sidelooking microwave radiometers and develops a technique to adjust cloudy emission values to equivalent clear emission measurements. Clouds of varying liquid water contents and altitudes were used with atmospheres representative of the arctic, mid-la...

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Bibliographic Details
Main Authors: Fowler,Mary Grace, Sze,Nien Dak, Gaut,Norman E., Chang,David T.
Other Authors: ENVIRONMENTAL RESEARCH AND TECHNOLOGY INC CONCORD MASS
Format: Text
Language:English
Published: 1975
Subjects:
Atmospheric Physics
*ATMOSPHERIC SCATTERING
*RADIOMETRY
TEMPERATURE
MICROWAVES
BRIGHTNESS
TROPICAL REGIONS
CLOUD COVER
ARCTIC REGIONS
ATMOSPHERIC SOUNDING
SIDE LOOKING RADAR
Arctic
Online Access:http://www.dtic.mil/docs/citations/ADA016765
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA016765
Description
Summary:This report determines the effects of clouds on sidelooking microwave radiometers and develops a technique to adjust cloudy emission values to equivalent clear emission measurements. Clouds of varying liquid water contents and altitudes were used with atmospheres representative of the arctic, mid-latitudes, and tropics. Their effects on microwave brightness temperatures were examined for frequencies between 15 and 55 GHz on a ground-based radiometer viewing at zenith angles from 0 degrees to 89 degrees. The strongest cloud effects were found for low elevation angles at frequencies away from the water vapor and oxygen lines. A technique is proposed which uses cloudy emission measurements made by a scanning two-channel radiometer, and a statistical inversion procedure, to infer equivalent clear emission values.

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