气候变化领域集成服务门户(CCPortal): Extreme precipitation over northern China in autumn 2021 and joint contributions of tropical and mid-latitude factors

CCPortal

DOI	10.1016/j.accre.2022.11.008
	Extreme precipitation over northern China in autumn 2021 and joint contributions of tropical and mid-latitude factors
	Gu, Wei; Chen, Li -Juan; Wang, Yong-Guang; Gao, Hui; Wang, Lin; Liu, Yu-Yun
发表日期	2022
ISSN	1674-9278
起始页码	835
结束页码	842
卷号	13 期号:6 页码:8
英文摘要	Frequent heavy precipitation and severe flood disasters struck northern China in early autumn 2021, with seven provinces/municipalities surpassing their precipitation records since 1961. Causes for such extreme events from the climate perspective are unclear because the variability of autumn precipitation in northern China is poorly understood. This study revealed that the event was directly caused by the extremely northwestward location of the western Pacific subtropical high (WPSH), which was jointly induced by several tropical and mid-latitude factors. The developing La Nina and warmer than normal tropical Atlantic sea surface temperature altered the Pacific Walker Circulation and enhanced the convection over the tropical western Pacific. Meanwhile, the Madden-Julian Oscillation stagnated for a long time in its phases 3-5 in early autumn and contributed constructively to the active convection over the tropical eastern Indian Ocean and western Pacific. These effects altogether excited a lower-tropospheric cyclone anomaly to the west of the Philippines and shifted the WPSH northwestwards in early autumn. A mid-latitude cyclonic centre was also observed upstream of East Asia. It dispersed Rossby wave energy southeastwards in the form of cold air invasions. The resultant convergence of cold and dry air from the north with warm and moist air from the south together caused extreme precipitation over northern China in autumn 2021. Relevant conclusions can enhance our current understanding of the causes of autumn extreme precipitation events in northern China and improve our ability to predict such events and prevent resultant disasters.
英文关键词	Precipitation; Northern China; Western Pacific subtropical high; La Nina; Atlantic; Sea surface temperature; Madden-Julian Oscillation
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000925570500001
来源期刊	ADVANCES IN CLIMATE CHANGE RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273961
作者单位	China Meteorological Administration; Nanjing University of Information Science & Technology; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Gu, Wei,Chen, Li -Juan,Wang, Yong-Guang,et al. Extreme precipitation over northern China in autumn 2021 and joint contributions of tropical and mid-latitude factors[J],2022,13(6):8.
APA	Gu, Wei,Chen, Li -Juan,Wang, Yong-Guang,Gao, Hui,Wang, Lin,&Liu, Yu-Yun.(2022).Extreme precipitation over northern China in autumn 2021 and joint contributions of tropical and mid-latitude factors.ADVANCES IN CLIMATE CHANGE RESEARCH,13(6),8.
MLA	Gu, Wei,et al."Extreme precipitation over northern China in autumn 2021 and joint contributions of tropical and mid-latitude factors".ADVANCES IN CLIMATE CHANGE RESEARCH 13.6(2022):8.