气候变化领域集成服务门户(CCPortal): Possible role of Southern Hemispheric sea ice in the variability of West China autumn rain

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DOI	10.1016/j.atmosres.2020.105329
	Possible role of Southern Hemispheric sea ice in the variability of West China autumn rain
	Zhou B.; Xu M.; Sun B.; Han T.; Cheng Z.
发表日期	2021
ISSN	0169-8095
卷号	249
英文摘要	West China Autumn Rain (WCAR), the last rainy season in China associated with the East Asian summer monsoon, is prone to flooding and secondary disasters and has profound impacts on the economic society. Thus, it is of great interest to understand its variability. Through an analysis with gridded rainfall data and reanalysis data, this study reveals that the variability of WCAR is positively correlated to the boreal summer (austral winter) sea ice concentration (SIC) in the Southern Indian and Pacific Ocean basins. Such a relationship is supported by the SIC-related changes in atmospheric circulations and water vapor transport. Corresponding to a high summer SIC, both the Lake Balkhash trough and the Asian low pressure are deepened, the East Asian jet shifts northward, and the water vapor transport to West China is enhanced during the boreal autumn, providing a favorable background for the increase of WCAR, and vice versa. The potential mechanism of how the boreal summer SIC affects the autumn atmospheric situation is further investigated. Results show that the atmospheric circulation in the high latitudes of the Southern Hemisphere possesses a seasonal persistence from the boreal summer to autumn due to the sea ice persistence. Thus, the boreal summer SIC-related anomalies in the upper-tropospheric winds over the Southern Indian and Pacific Ocean basins can persist to the following autumn and subsequently exert substantial influences on the Eurasian atmospheric circulations via two meridional teleconnections. The counterpart in the lower troposphere contributes to the water vapor transport toward West China. Certainly, this candidate mechanism is a preliminary explanation, and other processes may also act in their linkage. © 2020 The Author(s)
英文关键词	Atmospheric circulation; Meridional teleconnection; Sea ice; West China autumn rain
语种	英语
scopus关键词	Climatology; Oceanography; Rain; Sea ice; Troposphere; Water vapor; Atmospheric circulation; Atmospheric situations; Candidate mechanisms; East Asian summer monsoon; Sea ice concentration; Secondary disasters; Southern Hemisphere; Water vapor transport; Atmospheric movements; autumn; meridional circulation; rainfall; sea ice; seasonal variation; Southern Hemisphere; teleconnection; water vapor; China; Pacific Ocean; Southern Ocean
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145217
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science and Technology, Nanjing, 210044, China; School of Atmospheric Sciences, Chengdu University of Information Science and Technology, Chengdu, 610225, China
推荐引用方式 GB/T 7714	Zhou B.,Xu M.,Sun B.,et al. Possible role of Southern Hemispheric sea ice in the variability of West China autumn rain[J],2021,249.
APA	Zhou B.,Xu M.,Sun B.,Han T.,&Cheng Z..(2021).Possible role of Southern Hemispheric sea ice in the variability of West China autumn rain.Atmospheric Research,249.
MLA	Zhou B.,et al."Possible role of Southern Hemispheric sea ice in the variability of West China autumn rain".Atmospheric Research 249(2021).