Climate Change Research ›› 2017, Vol. 13 ›› Issue (6): 589-597.doi: 10.12006/j.issn.1673-1719.2017.047

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Changes in Classified Precipitation in the Urban, Suburban and Mountain Areas of Beijing

Yuan Yufeng1, Zhai Panmao2, Li Jian2, Chen yang2   

  1. 1 Key Laboratory of Meteorological Disaster of Ministry of Education, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
    2 State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • Received:2017-03-03 Revised:2017-03-20 Online:2017-11-30 Published:2017-11-30

Abstract:

In this paper, based on hourly precipitation observations during 1977-2013 from the Beijing area, hourly precipitation in summer (June-Auguest) is classified into three categories:light (below the 50th percentile values), moderate (the 50th to 95th percentile values), and heavy (above the 95th percentile values). The characteristics of the classified precipitation changes are analyzed and the results reveal that both light and moderate precipitation decreased significantly during the research period which mainly caused the decrease in summer totals, but heavy precipitation showed no pronounced trend. Since 2004, the contribution of heavy rainfall to the summer totals in the urban area increased as compared to the suburban area, which is opposite to light rainfall. There are obvious differences in the diurnal variations of classified precipitation. Light precipitation shows a double peak structure in the early morning and at night, while moderate and heavy rainfall show a single peak at night. Light precipitation at the early morning peak-time decreased significantly in the whole Beijing area. Compared with the suburban area, light precipitation in the urban area occurred less frequently whereas heavy precipitation occurred more frequently at evening peak-time after 2004. The asymmetry of the rainfall is obvious, especially, for heavy precipitation. The asymmetry of heavy precipitation events in the urban area exhibit a significant increasing trend.

Key words: hourly precipitation, classified precipitation, diurnal variation, asymmetry

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