Resources Science ›› 2017, Vol. 39 ›› Issue (6): 1084-1098.doi: 10.18402/resci.2017.06.09

• Orginal Article • Previous Articles     Next Articles

Spatio-temporal change characteristics and circulation causes of extreme precipitation in Fujian Province

Xiangyu GUO1(), Zhengfang WU1(), Haibo DU1, Lei WANG1, Mangen YANG2, Zhibiao CHEN2   

  1. 1. School of Geographical Science,Northeast Normal University,Changchun 130024,China
    2. School of Geographical Science,Fujian Normal University,Fuzhou 350007,China
  • Received:2016-04-18 Revised:2016-12-15 Online:2017-06-20 Published:2017-06-20

Abstract:

Extreme precipitation is an important aspect of climate change. Fujian Province is often affected by extreme precipitation events such as typhoons and severe convective weather and it is critical to research changes in extreme precipitation events in Fujian with respect to global warming. This study analyzed the spatio-temporal change in extreme precipitation in Fujian and circulation causes using trend analysis,Mann-Kendall abrupt change analysis,wavelet analysis,Point-Measured methods and correlational analysis. We used daily precipitation of 22 meteorological observation stations in Fujian from 1961 to 2013. We found that extreme precipitation increased. The SDII,R50mm and CWD indices experienced obvious abrupt changes around 1994,1995 and 1998,respectively. The period of oscillation of each extreme precipitation index was similar,including 2~3 years,6~8 years short-cycle and 10~12 years middle-cycle at large. Extreme precipitation had obvious spatial differences. PRCPTOT revealed a decreasing trend from the eastern coast to western inland. Extreme precipitation was influenced by the location of land and sea,terrain and latitude. Circulation seasonal variation in the number of Fujian Province Typhoons,and the intensity and location of the Subtropical High affected extreme precipitation in Fujian. There was a negative low value center in the geopotential height difference of 850hPa and the 1000hPa over Fujian,which promoted the occurrence of extreme precipitation events. These findings provide a scientific reference for further our understanding and predicting trends in extreme climate in the future and estimates and decision-making of agro-meteorological hazard influence in Fujian.

Key words: extreme precipitation, spatiotemporal change, circulation causes, Fujian Province