Climate Change Research ›› 2018, Vol. 14 ›› Issue (5): 445-454.doi: 10.12006/j.issn.1673-1719.2018.053

• Changes in Climate System • Previous Articles     Next Articles

Variation characteristics and influencing factors of extreme precipitation in the Meiyu area of Yangtze-Huai River Basin during 1960-2014

Cui HAN1,Yi-Xing YIN1(),Yi-Han HUANG1,Meng-Yang LIU1,Xiao-Jun WANG2,3   

  1. 1 School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
    2 Nanjing Hydraulic Research Institute, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China
    3 Research Center for Climate Change, Ministry of Water Resources, Nanjing 210029, China
  • Received:2018-04-16 Revised:2018-06-08 Online:2018-11-30 Published:2018-09-30


Based on the daily precipitation data from 66 stations in the Meiyu area of Yangtze-Huai River Basin and the NCEP/NCAR reanalysis data from 1960 to 2014, several extreme precipitation indices were used to explore the spatial and temporal variation characteristics and influencing factors of regional summer extreme precipitation with the help of trend analysis, EOF analysis and composite analysis. The main results are as follows: (1) The summer extreme precipitation indices mainly show an upward trend, and the significant ascending zone is mainly located in the eastern part of the region. (2) The first eigenvector of these indices shows a uniform “+” distribution pattern but it’s stronger in the north area, and the second has a “positive in the northwest and negative in the southeast” distribution pattern. Temporal coefficient of the first mode shows an upward trend but the second temporal coefficient has no obvious trend. (3) In the typical years of strong (weak) summer extreme precipitation, the location of the Western Pacific Subtropical High extends westward (eastward), and the mid-latitude region shows the meridional (zonal) circulation characteristics, which is favorable (unfavorable) for the occurrence of the extreme precipitation in the Yangtze-Huai River region. Meanwhile, the intensity of the summer extreme precipitation in the Meiyu area is abnormally strengthened (weakened) when the ascending motion is enhanced in the middle and lower troposphere (when the airflow divergence in the middle troposphere is enhanced), and the water vapor flux is enhanced and convergent (weakened and divergent), leading to more (less) extreme precipitation.

Key words: Extreme precipitation, Temporal and spatial characteristics, Circulation anomaly, Water vapor flux

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