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contributor authorSpencer, Roy W.
date accessioned2017-06-09T14:00:23Z
date available2017-06-09T14:00:23Z
date copyright1984/11/01
date issued1984
identifier issn0733-3021
identifier otherams-10787.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4145942
description abstractRain rate algorithms for spring, summer and fall that have been developed from comparisons between the brightness temperatures measured by the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) and rain rates derived from operational WSR-57 radars over land are described. Data were utilized from a total of 25 SMMR passes and 234 radars, resulting in ?12 000 observations of ?1600 km2 areas. Multiple correlation coefficients of 0.63, 0.80 and 0.75 are achieved for the spring, summer and fall algorithms, respectively. Most of this information is in the form of multifrequency contrast in brightness temperature, which is interpreted as a measurement of the degree to which the land-emitted radiation is attenuated by the rain systems. The SMMR 37 GHz channel has more information on rain rate than any other channel. By combining the lower frequency channels with the 37 GHz observations, variations in land and precipitation thermometric temperatures can be removed, leaving rain attenuation as the major effect on brightness temperature. Polarization screening at 37 GHz is found to be sufficient to screen out cases of wet ground, which is only important when the ground is relatively vegetation free. Heavy rain cases are found to be a significant part of the algorithms' success, because of the strong microwave signatures (low brightness temperatures) that result from the presence of precipitation-sized ice in the upper portions of heavily precipitating storms. If IR data are combined with the summer microwave data, an improved (0.85) correlation with radar rain rates is achieved.
publisherAmerican Meteorological Society
titleSatellite Passive Microwave Rain Rate Measurement over Croplands during Spring, Summer and Fall
typeJournal Paper
journal volume23
journal issue11
journal titleJournal of Climate and Applied Meteorology
identifier doi10.1175/1520-0450(1984)023<1553:SPMRRM>2.0.CO;2
journal fristpage1553
journal lastpage1562
treeJournal of Climate and Applied Meteorology:;1984:;volume( 023 ):;issue: 011
contenttypeFulltext


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