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Climatic Trends of Heavy Precipitation Spatial and Temporal Concentration in China

JIANG Aijun1, DU Yin2, XIE Zhiqing1, DING Yuguo3(1. Jiangsu Institute of Meteorological Sciences, Nanjing 210008, China;2. Department of Atmosphere, Nanjing University, Nanjing 210093, China;3. Nanjing University of Information Science & Technology, Nanjing 210044, China)  
Based on 740 stations daily precipitation datasets in China, the precipitation- concentration degree (PCD) and precipitation-concentration period (PCP) of different intensity durative precipitation events were calculated to analyze their statistical characteristics, mainly including spatial and temporal distributions, variations and climatic trends of the two parameters of the durative heavy precipitation events in China. It is proved that these two parameters of heavy rainfall can display the temporal inhomogeneity in the precipitation field. And it is also found that there is a good positive relationship between the precipitation-concentration degree and annual rainfall amount in eastern China and central China. This method can be applied in flood assessment and climate changing fields.
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