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Abstract
Daily precipitation amounts and frequencies from the CMORPH (Climate Prediction Center Morphing
Technique) and TRMM (Tropical Rainfall Measuring Mission) 3B42 precipitation products are validated
against warm season in-situ precipitation observations from 2003 to 2008 over the Tibetan Plateau and the
regions to its east. The results indicate that these two satellite datasets can better detect daily precipitation
frequency than daily precipitation amount. The ability of CMORPH and TRMM 3B42 to accurately detect
daily precipitation amount is dependent on the underlying terrain. Both datasets are more reliable over the
relatively flat terrain of the northeastern Tibetan Plateau, the Sichuan basin, and the mid-lower reaches of
the Yangtze River than over the complex terrain of the Tibetan Plateau. Both satellite products are able
to detect the occurrence of daily rainfall events; however, their performance is worse in regions of complex
topography, such as the Tibetan Plateau. Regional distributions of precipitation amount by precipitation
intensity based on TRMM 3B42 are close to those based on rain gauge data. By contrast, similar distributions
based on CMORPH di?er substantially. CMORPH overestimates the amount of rain associated with the
most intense precipitation events over the mid-lower reaches of the Yangtze River while underestimating
the amount of rain associated with lighter precipitation events. CMORPH underestimates the amount of
intense precipitation and overestimates the amount of lighter precipitation over the other analyzed regions.
TRMM 3B42 underestimates the frequency of light precipitation over the Sichuan basin and the mid-lower
reaches of the Yangtze River. CMORPH overestimates the frequencies of weak and intense precipitation
over the mid-lower reaches of the Yangtze River, and underestimates the frequencies of moderate and heavy
precipitation. CMORPH also overestimates the frequency of light precipitation and underestimates the
frequency of intense precipitation over the other three regions. The TRMM 3B42 product provides better
characterizations of the regional gamma distributions of daily precipitation amount than the CMORPH
product, for which the cumulative distribution functions are biased toward lighter precipitation events.
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Citation
WU Lu, ZHAI Panmao. 2012: Validation of Daily Precipitation from Two High-Resolution Satellite Precipitation Datasets over the Tibetan Plateau and the Regions to Its East. Journal of Meteorological Research, 26(6): 735-745.
WU Lu, ZHAI Panmao. 2012: Validation of Daily Precipitation from Two High-Resolution Satellite Precipitation Datasets over the Tibetan Plateau and the Regions to Its East. Journal of Meteorological Research, 26(6): 735-745.
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WU Lu, ZHAI Panmao. 2012: Validation of Daily Precipitation from Two High-Resolution Satellite Precipitation Datasets over the Tibetan Plateau and the Regions to Its East. Journal of Meteorological Research, 26(6): 735-745.
WU Lu, ZHAI Panmao. 2012: Validation of Daily Precipitation from Two High-Resolution Satellite Precipitation Datasets over the Tibetan Plateau and the Regions to Its East. Journal of Meteorological Research, 26(6): 735-745.
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