气候变化领域集成服务门户(CCPortal): The impact of large-scale circulation on daily fine particulate matter (PM2.5) over major populated regions of China in winter

CCPortal

DOI	10.5194/acp-22-6471-2022
	The impact of large-scale circulation on daily fine particulate matter (PM2.5) over major populated regions of China in winter
	Jia, Zixuan; Doherty, Ruth M.; Ordonez, Carlos; Li, Chaofan; Wild, Oliver; Jain, Shipra; Tang, Xiao
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	6471
结束页码	6487
卷号	22 期号:10 页码:17
英文摘要	Using a new high-resolution air quality reanalysis dataset for China for five winters from December 2013 to February 2018, we examine the influence of large-scale circulation on daily PM2.5 variability through its direct effect on key regional meteorological variables over three major populated regions of China: Beijing-Tianjin-Hebei (BTH), the Yangtze River Delta (YRD) and the Pearl River Delta (PRD). In BTH, a shallow East Asian trough curbs northerly cold and dry air from the Siberian High, enhancing PM2.5 pollution levels. Weak southerly winds in eastern and southern China, associated with a weakened Siberian High, suppress horizontal dispersion, contributing to air pollution accumulation over YRD. In PRD, weak southerly winds and precipitation deficits over southern China are conducive to high PM2.5 pollution levels. To account for these dominant large-scale circulation-PM2.5 relationships, we propose three new circulation-based indices for predicting different levels of air pollution based on regional PM2.5 concentrations in each region: a 500 hPa geopotential height-based index for BTH, a sea level pressure-based index for YRD and an 850 hPa meridional wind-based index for PRD. These three indices can effectively distinguish clean days from heavily polluted days in these regions, assuming variation is solely due to meteorology. We also find that including the most important regional meteorological variable in each region improves the performance of the circulation-based indices in predicting daily PM2.5 concentrations on the regional scale. These results are beneficial to understanding and forecasting the occurrence of heavily polluted PM2.5 days in BTH, YRD and PRD from a large-scale perspective.
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:000797457500001
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/273581
作者单位	University of Edinburgh; Complutense University of Madrid; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS; Lancaster University; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Jia, Zixuan,Doherty, Ruth M.,Ordonez, Carlos,et al. The impact of large-scale circulation on daily fine particulate matter (PM2.5) over major populated regions of China in winter[J],2022,22(10):17.
APA	Jia, Zixuan.,Doherty, Ruth M..,Ordonez, Carlos.,Li, Chaofan.,Wild, Oliver.,...&Tang, Xiao.(2022).The impact of large-scale circulation on daily fine particulate matter (PM2.5) over major populated regions of China in winter.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(10),17.
MLA	Jia, Zixuan,et al."The impact of large-scale circulation on daily fine particulate matter (PM2.5) over major populated regions of China in winter".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.10(2022):17.