Climatology Comparison Studies of Precipitations Between GPCP and Rain Gauges in China

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  • Funds:

    Supported by Grants of NKBRDPC (No.2004CB418304), NSFC grant of the Joint Research Fund for Overseas Chinese Young Scholars (No.40428006), NSFC (Nos.40175015 and 40375018)

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  • The Global Precipitation Climatology Project (GPCP) monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipitation in China in the period from January 1980 to December 2000. Results expose significantly consistent rainfall distributions between the both data in multi-year mean, multi-year seasonal mean, and multi-year monthly mean. Departures of monthly rainfall for each dataset also show a high correlation with an over 0.8 correlation coefficient. Analysis indicates small differences of both datasets during autumn,winter, and spring, but relative large ones in summer. Generally, the GPCP has trend of overestimating the rainfall rate. Based on above good relationship of both datasets, the GPCP data are used to represent distributions and variations of precipitation in the Tibetan Plateau and Northwest China. Results indicate positive departures of precipitation in summer in the west part of Tibetan Plateau in the 1980s and negative departures after the 1980s. For the west part of Northwest China, analysis illustrates precipitation decreases a little, but no clear variation tendency.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Climatology Comparison Studies of Precipitations Between GPCP and Rain Gauges in China

  • 1. School of Earth and Space Sciences,University of Sciences and Technology of China,Hefei 230026;
    School of Earth and Space Sciences,University of Sciences and Technology of China,Hefei 230026;
    School of Earth and Space Sciences,University of Sciences and Technology of China,Hefei 230026
Funds: Supported by Grants of NKBRDPC (No.2004CB418304), NSFC grant of the Joint Research Fund for Overseas Chinese Young Scholars (No.40428006), NSFC (Nos.40175015 and 40375018)

Abstract: The Global Precipitation Climatology Project (GPCP) monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipitation in China in the period from January 1980 to December 2000. Results expose significantly consistent rainfall distributions between the both data in multi-year mean, multi-year seasonal mean, and multi-year monthly mean. Departures of monthly rainfall for each dataset also show a high correlation with an over 0.8 correlation coefficient. Analysis indicates small differences of both datasets during autumn,winter, and spring, but relative large ones in summer. Generally, the GPCP has trend of overestimating the rainfall rate. Based on above good relationship of both datasets, the GPCP data are used to represent distributions and variations of precipitation in the Tibetan Plateau and Northwest China. Results indicate positive departures of precipitation in summer in the west part of Tibetan Plateau in the 1980s and negative departures after the 1980s. For the west part of Northwest China, analysis illustrates precipitation decreases a little, but no clear variation tendency.

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