ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis of Anomaly Characteristics of Extreme Precipitation in Flood Season i n the Midlower Reaches of theYangtze River
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Abstract:
By using the 1960—2004 flood season (from May to September) daily prec ipitation data of 87 stations in six provinces and one city in the midlower re aches of theYangtze River, with EOF, REOF, tendency analysis and Morlet wavelet a nalysis, it is analyzed that the annual extreme precipitation of various station s and its spatial distribution for the recent 45 years. The results show that th e average spatial distributions of the extreme precipitation display clear differences in flood season in the region. The consistently abnormal characteris tic i s the main spatial distribution mode of extreme precipitation in flood season in the region, and it is also the important mode that the south and the north are as are reverse change feature. The extreme precipitation of flood season is divi ded into four spatial distribution types, i.e., the two lakes and plain type, th e northern type, the coastland type and the southern type. The difference of the interannual change is clear in every subarea and from the longrange change te ndency to see, except the northeast of the region, the extreme precipitation sho ws increasing tendency. For the recent 45 years, the periodic oscillations of th e extreme precipitation are not well consistent in every distribution type.
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