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Trends in graded precipitation in China from 1961 to 2000
Authors:Jiaolan Fu  Weihong Qian  Xiang Lin  Deliang Chen
Institution:[1]Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871 [2]Earth Sciences Centre, Gothenburg University, Box 460, 405 30 Gothenburg, Sweden [3]Laboratory for Climate Studies/National Climate Center, China Meteorological Administration, No. 46 Zhongguancun Nandajie, Beijing 100081
Abstract:Daily precipitation rates observed at 576 stations in China from 1961 to 2000 were classified into six grades of intensity,including trace(no amount),slight(≤1 mm d-1),small,large,heavy,and very heavy.The last four grades together constitute the so called effective precipitation(>1 mm d-1).The spatial distribution and temporal trend of the graded precipitation days are examined.A decreasing trend in trace precipitation days is observed for the whole of China,except at several sites in the south of the middle section of the Yangtze River,while a decreasing trend in slight precipitation days only appears in eastern China.The decreasing trend and interannual variability of trace precipitation days is consistent with the warming trend and corresponding temperature variability in China for the same period,indicating a possible role played by increased surface air temperature in cloud formation processes.For the effective precipitation days,a decreasing trend is observed along the Yellow River valley and for the middle reaches of the Yangtze River and Southwest China,while an increasing trend is found for Xinjiang,the eastern Tibetan Plateau,Northeast China and Southeast China.The decreasing trend of effective precipitation days for the middle-lower Yellow River valley and the increasing trend for the lower Yangtze River valley are most likely linked to anomalous monsoon circulation in East China.The most important contributor to the trend in effective precipitation depends upon the region concerned.
Keywords:trends  graded precipitation days  intensity  effective precipitation  warming  China
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