气候变化领域集成服务门户(CCPortal): Contrasting impacts of two types of El Niño events on winter haze days in China's Jing-Jin-Ji region

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DOI	10.5194/acp-20-10279-2020
	Contrasting impacts of two types of El Niño events on winter haze days in China's Jing-Jin-Ji region
	Yu X.; Wang Z.; Zhang H.; He J.; Li Y.
发表日期	2020
ISSN	1680-7316
起始页码	10279
结束页码	10293
卷号	20 期号:17
英文摘要	El Niño events differ widely in their patterns and intensities. The regional climate anomalies caused by different types of El Niño events likely lead to various impacts on winter haze pollution in China. Based on long-Term site observations of haze days in China from 1961 to 2013, this study explores the effects of eastern Pacific (EP) and central Pacific (CP) types of El Niño events on the number of winter haze days (WHDs) in China s Jing-Jin-Ji (JJJ) region and the physical mechanisms underlying WHD changes. The results show statistically significant positive and negative correlations, respectively, between WHDs in the JJJ region and EP and CP El Niño events. At most sites in the JJJ region, the average WHD increased in all EP El Niño years, with the maximum change exceeding 2.0 d. Meanwhile, the average WHD decreased at almost all stations over this region in all CP El Niño years, with the largest change being more than 2.0 d. The changes in large-scale circulations indicate obvious positive surface air temperature (SAT) anomalies and negative sea level pressure (SLP) anomalies over North China, as well as southerly wind anomalies at the middle to low troposphere over eastern China in the winters of EP El Niño years. These anomalies are conducive to increases in WHDs in the JJJ region. However, there are significant northerly and northwesterly wind anomalies at the middle to low troposphere over eastern China, as well as stronger and wider precipitation anomalies in the winters of CP El Niño years, which contribute to decreased WHDs over the JJJ region. Changes in local synoptic conditions indicate negative SLP anomalies, positive SAT anomalies, and weakened northerly winds over the JJJ region in the winters of EP El Niño years. The total occurrence frequency of circulation types conducive to the accumulation (diffusion) of aerosol pollutants is increased (decreased) by 0.4% (0.2 %) in those winters. However, the corresponding frequency is decreased (increased) by 0.5% (0.6 %) in the winters of CP El Niño years. Our study highlights the importance of distinguishing the impacts of these two types of El Niño events on winter haze pollution in China s JJJ region. © 2020 American Institute of Physics Inc.. All rights reserved.
英文关键词	air temperature; atmospheric pollution; correlation; El Nino; haze; precipitation (climatology); regional climate; sea level pressure; synoptic meteorology; temperature anomaly; troposphere; wind; winter; China; Jingjinji; Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (East)
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168962
作者单位	State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of Cma, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, 200438, China; National Climate Center, China Meteorological Administration, Beijing, 100081, China
推荐引用方式 GB/T 7714	Yu X.,Wang Z.,Zhang H.,et al. Contrasting impacts of two types of El Niño events on winter haze days in China's Jing-Jin-Ji region[J],2020,20(17).
APA	Yu X.,Wang Z.,Zhang H.,He J.,&Li Y..(2020).Contrasting impacts of two types of El Niño events on winter haze days in China's Jing-Jin-Ji region.Atmospheric Chemistry and Physics,20(17).
MLA	Yu X.,et al."Contrasting impacts of two types of El Niño events on winter haze days in China's Jing-Jin-Ji region".Atmospheric Chemistry and Physics 20.17(2020).