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A statistical technique for determining rainfall over land employing Nimbus-6 ESMR measurementsAt 37 GHz, the frequency at which the Nimbus 6 Electrically Scanning Microwave Radiometer (ESMR 6) measures upwelling radiance, it was shown theoretically that the atmospheric scattering and the relative independence on electromagnetic polarization of the radiances emerging from hydrometers make it possible to monitor remotely active rainfall over land. In order to verify experimentally these theoretical findings and to develop an algorithm to monitor rainfall over land, the digitized ESMR 6 measurements were examined statistically. Horizontally and vertically polarized brightness temperature pairs (TH, TV) from ESMR 6 were sampled for areas of rainfall over land as determined from the rain recording stations and the WSR 57 radar, and areas of wet and dry ground (whose thermodynamic temperatures were greater than 5 C) over the Southeastern United States. These three categories of brightness temperatures were found to be significantly different in the sense that the chances that the mean vectors of any two populations coincided were less than 1 in 100.
Document ID
19790002500
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Rodgers, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Siddalingaiah, H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chang, A. T. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wilheit, T. T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1978
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-TM-79631
Accession Number
79N10671
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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