Evolvement of Precipitation Extremes in Northeast China on the Background of Climate Warming

Abstract

Determination of the threshold by Gamma distribution function and study on spatial and temporal change of precipitation extremes are based on the daily precipitation data of 93 stations during the period 1959-2002 in Northeast China.The main results are summarized as follows: The precipitation extremes' thresholds decreased gradually from the southeast littoral areas to the northwestern inland.Precipitation extremes were concentrated in JuneSeptember,and the increasing was a catastrophe during the period 1985-2002.The probability of the precipitation extremes successively occurred was greater,in which the neighbouring extremes separated by a time gap of 1-5 days was 23.7%.The total extremes increased especially in the lower reaches of the Songhua River and the Mudanjiang River,and the upper reaches of the Liaohe River,as the same with the precipitantion extreme with the time gap of 1-5 days.