NDLI: Physical Validation of Trmm Tmi and PR Monthly Rain Products Over Oklahoma

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Physical Validation of Trmm Tmi and PR Monthly Rain Products Over Oklahoma

Content Provider	Semantic Scholar
Author	Fisher, Brad L.
Copyright Year	2013
Abstract	This paper reports on the results of a regional validation study of monthly rainfall products generated from sensor measurements aboard the Tropical Rainfall Measuring Mission (TRMM) satellite. The study analyzed four-years of rainfall estimates (1998-2oO1) produced from data collected by the TRMM microwave imager (TMI) and the precipitation radar (PR), and compared them with corresponding rain estimates computed from 66 rain gauges in the Oklahoma Mesonet. The rain estimates from all sensors were gridded at 1" x 1" and 2" x 5". The aim of this study was to estimate an annual error budget for the TMI and PR using a methodology designed to decouple retrieval and sampling error. The methodology of the study sub-sampled the gauge data at satellite overpass times, and estimated monthly rainfall amounts using a simple method of bulk statistical integration. This approach yielded two distinct rain parameters: 1) Go-integration at all times during observation period (5-minute accumulations) and 2) Gs-bulk statistical integration (sub-sampled during overpasses). These two gauge-inferred rain parameters provided enough information to determine the sampling and retrieval errors for the satellite. The sampling errors computed for the TMI and PR using this methodology were closely correlated, with overall sampling biases of 5.9% and 7.7%, respectively. The overall retrieval biases were about 10% for the TMI and 29% for the PR. Since retrieval errors were computed in bulk, some of this difference was attributed to an offsetting seasonal bias observed in the TMI estimates, which was negative during the winter months and positive during the summer months.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20040015297.pdf
Alternate Webpage(s)	http://www.grantcapriotti.com/Physical_Validation_of_Trmm_Tmi_and_PR_Monthly_Rain_Products_Over_Oklahomaf2e.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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