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[1]Ren Jiancheng,Gu Shanqing,Lu Xiaoning.Regional Characteristics and Trend Analysis of Annual Precipitation in Shandong Province Based on REOF[J].Research of Soil and Water Conservation,2024,31(01):224-231.[doi:10.13869/j.cnki.rswc.2024.01.018]

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Regional Characteristics and Trend Analysis of Annual Precipitation in Shandong Province Based on REOF

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 01 Page number: 224-231 Column: Public date: 2024-02-20

Title:: Regional Characteristics and Trend Analysis of Annual Precipitation in Shandong Province Based on REOF

Author(s):: Ren Jiancheng^1,2, Gu Shanqing^1,2, Lu Xiaoning³; (1.Shandong Key Laboratory of Meteorological Disaster Prevention and Reduction, Jinan 250031, China; 2.Binzhou Meteorological Bureau, Binzhou,Shandong 256612, China; 3.Chengdu University of Information Technology, Chengdu 610225, China)

Keywords:: precipitation; regional characteristics; rotating empirical orthogonal function; rescaled range analysis; Shandong Province

CLC:: P426.6

DOI:: 10.13869/j.cnki.rswc.2024.01.018

Abstract:: [Objective] Exploring the spatiotemporal characteristics of annual precipitation in different climate zones in Shandong Province is expected to provide a more regional reference basis for climate analysis, disaster prevention and reduction in the region. [Methods] According to the annual precipitation data of ground meteorological observatories in 95 countries of Shandong Province in the period from 1991 to 2020, the annual precipitation data in Shandong Province were divided into climate regions, and then the spatiotemporal variation characteristics of precipitation in each region were analyzed by using relevant statistical methods. [Results](1)In Shandong Province, there were more years with less precipitation modalities, and more precipitation intensity in years with more precipitation, and the interdecadal variation was obvious, but the distribution and intensity changes of years with more and less precipitation in each mode were different.(2)The annual precipitation in Shandong Province decreases from southeast to northwest. The annual precipitation data were divided into three regions: southeast coastal area(Zone I), northwest plain area(Zone Ⅱ)and central hilly area(Zone Ⅲ). The annual precipitation in each precipitation region showed no significant increase trend, with different trend rates and no obvious mutation.(3)The annual precipitation of each precipitation subarea in Shandong Province had obvious periodic characteristics. There were two obvious energy centers in the annual precipitation data of the southeast coastal area, with the central scale of 2～3 years, and the future change has strong sustainability. There were three obvious energy centers in the annual precipitation data in the northwest plain, with the central scales of 5～7 years, 3 a and 2～3 years, respectively. There were two obvious energy centers in the annual precipitation data in the central hilly region, with the central scales of 2～3 years and 6 years, respectively. The future changes are of strong sustainability. [Conclusion] Shandong Province has more years with less precipitation and more precipitation intensity, and the annual precipitation field can be roughly divided into three zones, and the annual precipitation in each region has obvious cyclical characteristics, and future changes are continuous.

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Last Update: 2024-02-20