Determination of the Robustness of Passive Microwave Measurements and Derivative Parameters for Use in Precipitation Discrimination Over Land.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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In this study, a large set of microwave and infrared parameters, derived from the Special Sensor MicrowaveImager SSMI and the Indian Geosynchronous Satellite INSAT, are examined to qualitatively determine how much contrast exists between raining and non-raining conditions over land. The precipitation regime of the Indian summer monsoon was chosen for the evaluation testbed. Each of the microwave parameters contain measurements which were enhanced, through a deconvolution technique, to match the spatial resolution of the 85 GHz channel 15 x 13 km. The microwave and infrared measurements are grouped into Probability Distribution Functions PDFs and Cumulative Distribution Functions CDFs containing one week of measurements for each parameter and time of satellite measurement within a Indian subdivision. The mean and standard deviation of each PDF and the slope and intercept factors of each CDF are tested for robustness against weekly subdivisional raingage data.