Objective Identification and Variation Characteristics of Regional Heavy Rainfall Events in the East of Southwestern China

  • Jie ZHOU ,
  • Junhu ZHAO ,
  • Yonghua LI ,
  • Xukai ZOU
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  • <sup>1.</sup>Chongqing Climate Center,Chongqing 401147,China;<sup>2.</sup>National Climate Center,Beijing 100081,China

Received date: 2020-03-30

  Online published: 2021-08-28

Abstract

The regional heavy rainfall events (RHREs) were identified by using the Objective Identification Technique for Regional Extreme Events (OITREE) based on the daily precipitation data of 118 stations in eastern Southwest China (ESWC) from 1961 to 2018.The parameters related to OITREE method were determined.There are 246 RHREs in total in the ESWC from 1951 to 2018, of which 25 are extreme RHREs.The strongest RHRE occurred on 3-6 September 2004, detected by the comprehensive intensity.Further analysis shows that the duration of the RHREs in the ESWC is generally 2 days and the longest duration is 5 days.The cumulative intensity of RHREs is about 500~1000 mm, and the cumulative area is about 10×104~20×104 km2.RHREs in the ESWC occur frequently from May to September, with the highest frequency of the RHREs in July, accounting for 31.7% of the total occurrence frequency.The plain areas in eastern Sichuan and western Chongqing are the center areas with the highest frequency and intensity of RHREs.During the past 58 years, the number of persistent RHREs in the ESWC shows a significant increasing trend at the rate of 0.57 times per decade.Also, the duration, the maximum impacted area and the extreme precipitation of the RHREs are all show a significant increasing trend at the rate of 1.2 d·(10a)-1, 5.7×104 km2·(10a)-1 and 73.4 mm·(10a)-1, respectively.

Cite this article

Jie ZHOU , Junhu ZHAO , Yonghua LI , Xukai ZOU . Objective Identification and Variation Characteristics of Regional Heavy Rainfall Events in the East of Southwestern China[J]. Plateau Meteorology, 2021 , 40(4) : 789 -800 . DOI: 10.7522/j.issn.1000-0534.2020.00048

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