Temporal and Spatial Characteristics of Extreme Hourly Precipitation over Eastern China in the Warm Season |
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| Authors: | ZHANG Huan and ZHAI Panmao |
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| Institution: | State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081,State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | Based on hourly precipitation data in eastern China in the warm season during 1961--2000, spatial
distributions of frequency for 20 mm h-1 and 50 mm h-1 precipitation were analyzed, and the criteria
of short-duration rainfall events and severe rainfall events are discussed. Furthermore, the percentile method
was used to define local hourly extreme precipitation; based on this, diurnal variations and trends in extreme
precipitation were further studied.
The results of this study show that, over Yunnan, South China, North China,
and Northeast China, the most frequent extreme precipitation events occur
most frequently in late afternoon and/or early evening. In the Guizhou
Plateau and the Sichuan Basin, the maximum frequency of extreme
precipitation events occurs in the late night and/or early morning. And in
the western Sichuan Plateau, the maximum frequency occurs in the middle of
the night.
The frequency of extreme precipitation (based on hourly rainfall
measurements) has increased in most parts of eastern China, especially in
Northeast China and the middle and lower reaches of the Yangtze River, but
precipitation has decreased significantly in North China in the past 50
years. In addition, stations in the Guizhou Plateau and the middle and lower
reaches of the Yangtze River exhibit significant increasing trends in hourly
precipitation extremes during the nighttime more than during the daytime. |
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| Keywords: | hourly precipitation data short-duration extreme precipitation diurnal cycle climatic distribution trends |
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