气候变化领域集成服务门户(CCPortal): Influence of East Asian winter monsoon on particulate matter pollution in typical regions of China

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DOI	10.1016/j.atmosenv.2021.118213
	Influence of East Asian winter monsoon on particulate matter pollution in typical regions of China
	Li Y.; An X.; Zhang P.; Yang J.; Wang C.; Li J.
发表日期	2021
ISSN	1352-2310
卷号	260
英文摘要	This study uses the NCEP/NCAR monthly average reanalysis and number of haze day data during 1958–2017, and the average daily PM2.5 mass concentration data during 2013–2017, to calculate the East Asian winter monsoon index (EAWMI) and statistically analyze the correlation between the winter monsoon index and air quality in China, particularly for the five typical regions (Beijing-Tianjin-Hebei, Fen-Wei Plain, Sichuan-Chongqing Delta, Yangtze River Delta, and Pearl River Delta). Thereafter, the strong and weak winter monsoon years were classified based on the EAWMI, and the atmospheric circulation and temperature fields over China and the five regions in different winter monsoon years were spatially compared. Finally, the study also investigated the various distribution features of the climatic circulation background responsible for the strong and weak winter monsoons and their impact mechanisms on air quality the five typical regions in China. The results show that the effect of the winter monsoon on the air quality of China may be represented by a north–south boundary line located at approximately 30° N. During strong winter monsoon years, pollution was lower in the area north of the boundary but higher to its south. By contrast, the opposite phenomenon was observed during the weak monsoon years. During the strong winter monsoon years, the Beijing-Tianjin-Hebei region and Fen-Wei Plain to the north of the boundary line were less polluted, while the Yangtze River, Chengdu-Chongqing, and Pearl River delta regions to the south of the boundary were more polluted. Diagnostic analysis of the circulation field indicated that during the strong winter monsoon years, an abnormal downward airflow occurred to the south of the boundary, limiting convective diffusion and thereby causing the increased pollution. However, during the weak winter monsoon years, ascending airflows occurred, which favored pollutant diffusion. Furthermore, during the strong winter monsoon years, an abnormal southeast airflow with weak horizontal wind speed occurred in the lower atmosphere of the Chengdu-Chongqing region, causing localized pollutant accumulation, thereby aggravating the pollution. In the Pearl River Delta region, a descending abnormal westerly flow inhibited the local uplift and diffusion of air. Moreover, importing pollutants occurred from the north, aggravating the pollution in the region. © 2021 Elsevier Ltd
关键词	Air pollution Circulation background East asian winter monsoon North-south boundary line Typical regions of China
语种	英语
scopus关键词	Air quality; Diffusion; Particles (particulate matter); River pollution; Rivers; Wind; Boundary lines; Chengdu; Chongqing; Circulation background; East Asian winter monsoon; Monsoon index; North-south boundary line; Pearl River Delta region; Typical region of china; Atmospheric thermodynamics; air pollution; air quality; airflow; article; China; diffusion; haze; particulate matter 2.5; river; wind speed; winter
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/248352
作者单位	Chengdu University of Information Technology, Chengdu, 610225, China; Chinese Academy of Meteorological Sciences, Beijing, 100081, China; National Climate Center, Beijing, 100081, China; Ningxia Climate Center, Yinchuan, 750000, China
推荐引用方式 GB/T 7714	Li Y.,An X.,Zhang P.,et al. Influence of East Asian winter monsoon on particulate matter pollution in typical regions of China[J],2021,260.
APA	Li Y.,An X.,Zhang P.,Yang J.,Wang C.,&Li J..(2021).Influence of East Asian winter monsoon on particulate matter pollution in typical regions of China.ATMOSPHERIC ENVIRONMENT,260.
MLA	Li Y.,et al."Influence of East Asian winter monsoon on particulate matter pollution in typical regions of China".ATMOSPHERIC ENVIRONMENT 260(2021).