Climate Change Research ›› 2019, Vol. 15 ›› Issue (6): 575-583.doi: 10.12006/j.issn.1673-1719.2018.172

• Changes in Climate System •     Next Articles

Objective identification and climatic characters of the regional rainstorm event in China from 1961 to 2016

Dian-Xiu YE,Zun-Ya WANG,Rong GAO,Rong WANG,Chan XIAO   

  1. National Climate Center, China Meteorological Administration, Beijng 100081, China
  • Received:2018-12-03 Revised:2019-03-26 Online:2019-11-30 Published:2019-11-30


An objective method is proposed to identify the regional rainstorm event by tracing contineously the rainstorm area, according to the extent of rainstorm area and the distance between the rainstorm areas on two consecutive days. Moreover, the comprehensive intensity assessing method is developed basing on the intensity, persistency and extent of the regional rainstorm event. Using the daily precipitation data from 2287 stations in China during 1961-2016, the historical regional rainstorm events are identified and the climatology and changing trends of the events are revealed. It is found that, China’s regional rainstorm process averages 38.5 times per year. The regional rainstorm event occurs in every month of the year but mainly from April to September. The frequency of the event is the most in July and August, while the duration is longer, the range is wider and the comprehensive intensity is stronger in June, which is related to the Meiyu phenomenon in the middle and lower reaches of the Yangtze River. Climatically, the average time of the first occurrence of regional rainstorm is March 6, and the average time of the last occurrence is November 14 in a year. From 1961 to 2016, the first occurrence date of regional rainstorm in China is obviously advanced, the last occurrence date is obviously backward, and the rainstorm period is obviously increased. The annual occurrence frequency increased slightly, but the frequency of strong regional rainstorm increased obviously. The coverage area and comprehensive intensity of the regional rainstorm show a significant increase. The variation trend of regional rainstorm of southern type is basically consistent with that of the whole country. The first occurrence date of the regional rainstorm of northern type is advanced, the last occurrence date is pushed back, the occurrence frequency is slightly decreased, and there is no significant change in coverage, duration and comprehensive strength.

Key words: Regional rainstorm event, Objective identification, Climatic characteristics, Changing trend

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