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© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The middle and lower reaches of the Yangtze River (MLYR) frequently experience extreme precipitation events (EPEs) during June and July, the so-called Meiyu season. This study investigated EPEs in the MLYR during Meiyu seasons over 1961–2022, using rain gauge observations and ERA5 reanalysis data. EPEs associated with the Northeast China cold vortex featured more undulating westerlies with a distinct wave train pattern from Europe to Northeast Asia. Due to robust Rossby wave energy, the trough deepened from Northeast China towards the MLYR and was confronted with a westward extension of the western Pacific subtropical high. Such a configuration enhanced the warm and moist monsoon conveyor belt and convergence of water vapor flux from southwestern China to the MLYR. The warm and moist air favored upward motion. The increased rainfall prevailed from southwestern China to the MLYR. In contrast, ordinary EPEs were characterized by zonal westerlies and weaker Rossby wave propagation. The Meiyu trough was comparatively shallow and confined to the MLYR with less westward expansion of the subtropical high. In response, the warm and moist monsoon conveyor belt was more localized, resulting in weaker EPEs in the MLYR.

Details

Title
Northeast China Cold Vortex Amplifies Extreme Precipitation Events in the Middle and Lower Reaches Yangtze River Basin
Author
Chen, Hao 1 ; Xie, Zuowei 2   VIAFID ORCID Logo  ; He, Xiaofeng 3 ; Zhao, Xiaodong 3 ; Gao, Zongting 4   VIAFID ORCID Logo  ; Wu, Biqiong 5 ; Zhang, Jun 5 ; Zou, Xiangxi 5 

 Hubei Key Laboratory of Intelligent Yangtze and Hydroelectric Science, China Yangtze Power Co., Ltd., Yichang 443000, China; [email protected] (H.C.); [email protected] (J.Z.); [email protected] (X.Z.); Huafeng Meteorological Media Group Co., Ltd., Beijing 100081, China; [email protected] 
 International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 
 Huafeng Meteorological Media Group Co., Ltd., Beijing 100081, China; [email protected] 
 Northern Research Center of Key Laboratory for Basin Heavy Rainfall, Jilin Provincial Key Laboratory of Changbai Mountain Meteorology & Climate Change, Institute of Meteorological Sciences of Jilin Province, China Meteorological Administration, Changchun 130062, China 
 Hubei Key Laboratory of Intelligent Yangtze and Hydroelectric Science, China Yangtze Power Co., Ltd., Yichang 443000, China; [email protected] (H.C.); [email protected] (J.Z.); [email protected] (X.Z.) 
First page
819
Publication year
2024
Publication date
2024
Publisher
MDPI AG
e-ISSN
20734433
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3084736681
Copyright
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.