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Analysis on characteristics of extreme precipitation indices and atmospheric circulation in Northern Shanxi

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This article utilizes daily precipitation data from 28 national meteorological stations in northern Shanxi Province spanning from 1972 to 2020,and the US NCEP/NCAR monthly average reanalysis and ERAS monthly average reanalysis data.The study employs techniques such as empirical orthogonal function(EOF)decomposition,Mann-Kendall mutation and other methods to investigate the spatiotemporal distribution of extreme precipitation index in northern Shanxi and their correlation with atmospheric circulation.The research results show that the absolute index,relative index,intensity index and sustained dry period index(CDD)in the continuous index appear from southwest to northeast.The spatial distribution characteristics of the central region decrease,while the contin-uous wet period(CWD)decreases from the central to the east and west.The three indices Rx1day,Rx5day,and CWD mutated in 1978,1975,and 1983 respectively,and other extreme precipitation indices all appeared in a sudden change from a low-value period to a high-value period occurred around 2010.In the high-value years of the summer extreme precipitation index,there is a significant negative anomaly in the height field in the mid-high latitude regions of Eurasia.Northern Shanxi is controlled by a broad low-pressure trough in the Lake Baikal area.Water vapor transported via the east,west,and south routes converges in the northern Shanxi region and en-counters cold air from the north.There is a strong upward motion anomaly at 500 hPa in the troposphere,and the dynamic conditions of upper-level divergence and lower-level convergence lead to more summer extreme pre-cipitation in the northern Shanxi region.Conversely,in the low-value years of the summer extreme precipitation index,northern Shanxi is affected by a strong high-pressure ridge north of Lake Baikal.There is a downward motion anomaly at 500 hPa,and the northern Shanxi region lacks water vapor.The cold and warm air cannot converge,and both the water vapor conditions and dynamic conditions are poor,which is not conducive to the production of extreme precipitation in northern Shanxi.

Northern ShanxiExtreme precipitation indicesSpatio-temporal distribution and evolutionMutationsAtmospheric circulation anomaly

Xia Cai、Yan Song、Lin Cai、Xin Su、GuiHua Liang、YanMing Xu

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Shuozhou Meteorological Bureau of Shanxi Province,Shuozhou,Shanxi 036002,China

China Meteorological Administration Training Center,Beijing 100081,China

Heze University of Shandong Province,Heze,Shandong 274000,China

Huafeng Meteorological Media Group,Beijing 100081,China

Shuocheng Meteorological Bureau,Shuozhou,Shanxi 036002,China

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National Natural Science Foundation of ChinaChina Meteorological Administration Training Centre scientific research project(Study on impacting factors of regional climate iShanxi Provincial Meteorological Bureau projectHeze University Research Fund Program(Poverty Alleviation Project)

41575091SXKMSQH20236329XY18FP08

2024

10.1016/j.rcar.2024.03.007

寒旱区科学(英文版)
中国科学院寒区旱区环境与工程研究所,科学出版社有限责任公司

寒旱区科学(英文版)

影响因子：0.237
ISSN：1674-3822
年,卷(期)：2024.16(2)
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