Arid Zone Research ›› 2022, Vol. 39 ›› Issue (1): 104-112.doi: 10.13866/j.azr.2022.01.11

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Spatial-temporal variations in extreme precipitation and their relationship with atmospheric circulation in the Guanzhong Plain

DING Yingying1(),QIU Dexun2,WU Changxue1,MU Xingmin1,2,GAO Peng1,2()   

  1. 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, Shaanxi, China
    2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China
  • Received:2021-09-09 Revised:2021-10-25 Online:2022-01-15 Published:2022-01-24
  • Contact: Peng GAO E-mail:2802905386@qq.com;gaopengl@ms.iswc.ac.cn

Abstract:

Based on daily precipitation data collected from 13 meteorological stations in the Guanzhong Plain in 1957-2019, the extreme precipitation indices were calculated and their spatial-temporal variation characteristics were analyzed. Specifically, the correlation between extreme precipitation and atmospheric general circulation was explored using a unitary linear regression method, Pearson correlation analysis, and wavelet coherence analysis. The results showed the following. (1) Extreme precipitation intensity showed an increasing trend at a rate of 0.007 mm·d-1·(10a)-1, whereas other extreme precipitation indices showed a decreasing trend in which the annual total extreme precipitation showed the most pronounced decreased with a rate of -5.528 mm·(10a)-1. Additionally, none of the extreme precipitation indices had a significant mutation point. (2) The extreme precipitation indices were higher in the south and lower in the north, with a significant spatial difference detected. (3) Only the southern oscillation index (SOI) had a significant effect on extreme precipitation. The larger the SOI value, the more likely it was to rain less on the Guanzhong Plain. These results provide a theoretical basis for flood disaster prevention and control on the Guanzhong Plain.

Key words: Guanzhong Plain, extreme precipitation, spatial-temporal variation, atmospheric circulation