NDLI: Precipitation retrievals using radiometric and spatial information of passive microwave radiometers

Content Provider	IEEE Xplore Digital Library
Author	Shin, D.-B. Chiu, L.S.
Copyright Year	2003
Description	Author affiliation: Center for Earth Obs. & Space Res., George Mason Univ., Fairfax, VA, USA (Shin, D.-B.; Chiu, L.S.)
Abstract	The effect of rainfall inhomogeneity within the sensor field-of-view (FOV), the so-called beam-filling error, affects significantly the accuracy of rainfall retrievals. Observational analyses of Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and Precipitation Radar (PR) data show that the beam-filling error can be examined in terms of the coefficient of variation (CV, standard deviation divided by mean rain rate) that provides a measure of the spatial variability. Furthermore, the CV of surface rainfall from PR is related to its vertical structure and has some correlation with the TMI 85 GHz brightness temperature (Tb), especially at the high rain rates. Based on these findings, we exploit the 85 GHz spatial variability in the context of a Bayesian-type inversion method for rainfall retrieval. The spatial variability at various domain sizes (thus CV in a vector form) is blended with the sets of multi-channel brightness temperatures (Tb vector) for the Bayesian inversion. The a-priori databases for the inversion are constructed from the collocated TMI and PR observations at the PR resolution. Through synthetic retrievals we demonstrated that the inclusion of CV information of the Tb remarkably improved the rainfall retrieval accuracy by reducing the effect of the rainfall inhomogeneity.
Starting Page	3169
Ending Page	3171
File Size	1360384
Page Count	3
File Format	PDF
ISBN	0780379292
DOI	10.1109/IGARSS.2003.1294718
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-07-21
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Information retrieval Microwave radiometry Radiometers Microwave measurements Rain Brightness temperature Bayesian methods Image analysis Radar imaging Radar measurements
Content Type	Text
Resource Type	Article

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