气候变化领域集成服务门户(CCPortal): Climatological intraseasonal oscillation of the summertime haze-fog in eastern China

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DOI	10.1016/j.atmosenv.2020.117951
	Climatological intraseasonal oscillation of the summertime haze-fog in eastern China
	Liu Q.; Sheng L.; Chen G.
发表日期	2021
ISSN	1352-2310
卷号	244
英文摘要	Eastern China has recently experienced frequent haze-fog events that are widely thought to be modulated by atmospheric conditions. Using the climatological pentad mean occurrence frequency of haze-fog, for the first time, we found that the haze-fog frequency in eastern China (115°–125°E, 20°–40°N) presents a statistically significant climatological intraseasonal oscillation (CISO) with a period of approximately 50 days. The haze-fog CISO exhibits three cycles from May to September, with peaks occurring in mid-June, late July and mid-September. Among these three cycles, the first two have relatively large amplitudes and usually show northward phase propagation. A positive anomaly of haze-fog occurrence frequency propagates primarily from South China to North China, with a decreasing speed from 1.0 to 0.54° lat day−1. By dividing the cycle of haze-fog CISO into 8 phases, regional differences in haze-fog CISO are discovered. North China has a shorter “polluted” phase than the Yangtze River Basin and South China. Further analysis shows that the haze-fog CISO is connected to the summer monsoon via physical and chemical processes. The enhanced monsoon directly reduces haze-fog by active convection and strong winds, while the slowing horizontal wind speeds and anomalous sinking motion in the weakened phase of monsoon lead to an increase in haze-fog. In addition, the weakened monsoon will also indirectly increase haze-fog by enhancing the photochemical process. © 2020 Elsevier Ltd
关键词	Eastern China Haze-fog Intraseasonal oscillation Summer monsoon
语种	英语
scopus关键词	Atmospheric thermodynamics; Chemical analysis; Tropical engineering; Atmospheric conditions; Chemical process; Horizontal winds; Intraseasonal oscillations; Phase propagation; Photochemical process; Regional differences; Yangtze River basin; Fog; climatology; fog; haze; monsoon; photochemistry; seasonality; temperature anomaly; thermal convection; wind velocity; article; chemical reaction; China; haze; oscillation; river basin; summer; thermodynamics; wind speed; China; Yangtze Basin
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248829
作者单位	School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Zhuhai, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China; College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China
推荐引用方式 GB/T 7714	Liu Q.,Sheng L.,Chen G.. Climatological intraseasonal oscillation of the summertime haze-fog in eastern China[J],2021,244.
APA	Liu Q.,Sheng L.,&Chen G..(2021).Climatological intraseasonal oscillation of the summertime haze-fog in eastern China.ATMOSPHERIC ENVIRONMENT,244.
MLA	Liu Q.,et al."Climatological intraseasonal oscillation of the summertime haze-fog in eastern China".ATMOSPHERIC ENVIRONMENT 244(2021).