Temporal and Spatial Variations of Extreme Precipitation in China-Pakistan Economic Corridor

  • Jinyu CHEN ,
  • Hui TAO ,
  • Jinping LIU ,
  • Jianqing ZHAI ,
  • Buda SU ,
  • Tong JIANG
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  • <sup>1.</sup>State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China;<sup>2.</sup>University of Chinese Academy of Science,Beijing 100049,China;<sup>3.</sup>College of Surveying and Geo-informatics,North China University of Water Resources and Electric Power,Zhengzhou 450046,Henan,China;<sup>4.</sup>National Climate Center,China Meteorological Administration,Beijing 100081,China;<sup>5.</sup>Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Institute for Disaster Risk Management,School of Geographical Sciences,Nanjing University of Information Science & Technology,Nanjing 210044,Jiangsu,China

Received date: 2020-09-15

  Online published: 2021-10-28

Abstract

Based on the observed daily precipitation from 1961 to 2015 in the China-Pakistan Economic Corridor (CPEC), the spatial interpolation software ANUSPLIN was used to grid the observations.An improved percentile method was used to calculate the extreme precipitation threshold, while the spatial and temporal distribution characteristics of the extreme precipitation amounts, intensities and frequencies were also analyzed in the CPEC region.Furthermore, a generalized extreme distribution method was used to estimate the return period of extreme precipitation in the study area.Results revealed that: (1) trends of extreme precipitation and the number of days of extreme precipitation had non-significant increasing trend, whereas the time trend of extreme precipitation intensity was stable.(2) The spatial distribution of extreme precipitation and extreme precipitation threshold in the study area manifested similar characteristics, while the spatial distribution of extreme precipitation frequencies was more uniform and showed a "southwest low-northeast high" step-like distribution; however areas with the highest extreme precipitation intensities were mainly concentrated in the south of Sindh province and 35°N, reaching over 50 mm·d-1.(3) The spatial distribution of different return periods indicated that extreme precipitation exhibited a strong regional pattern, with the range of high return levels in the 35°N region gradually decreasing as the return period increases, and the region of high return levels can be detected in the 30°N region with the encounter of 25 a, and continues to increase in the range of the region with the return period of 50 a.

Cite this article

Jinyu CHEN , Hui TAO , Jinping LIU , Jianqing ZHAI , Buda SU , Tong JIANG . Temporal and Spatial Variations of Extreme Precipitation in China-Pakistan Economic Corridor[J]. Plateau Meteorology, 2021 , 40(5) : 1048 -1056 . DOI: 10.7522/j.issn.1000-0534.2020.00103

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