气候变化领域集成服务门户(CCPortal): Composited analyses of the chemical and physical characteristics of co-polluted days by ozone and PM2.5 over 2013-2020 in the Beijing-Tianjin-Hebei region

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DOI	10.5194/acp-23-23-2023
	Composited analyses of the chemical and physical characteristics of co-polluted days by ozone and PM2.5 over 2013-2020 in the Beijing-Tianjin-Hebei region
	Dai, Huibin; Liao, Hong; Li, Ke; Yue, Xu; Yang, Yang; Zhu, Jia; Jin, Jianbing; Li, Baojie; Jiang, Xingwen
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	23
结束页码	39
卷号	23 期号:1 页码:17
英文摘要	The co-polluted days by ozone (O-3) and PM2.5 (particulate matter with an aerodynamic equivalent diameter of 2.5 mu m or less) (O-3-PM(2.5)PDs) were frequently observed in the Beijing-Tianjin-Hebei (BTH) region in warm seasons (April-October) of 2013-2020. We applied the 3-D global chemical transport model (GEOS-Chem) to investigate the chemical and physical characteristics of O-3-PM(2.5)PDs by composited analyses of such days that were captured by both the observations and the model. Model results showed that, when O-3-PM(2.5)PDs occurred, the concentrations of hydroxyl radical and total oxidant, sulfur oxidation ratio, and nitrogen oxidation ratio were all high, and the concentrations of sulfate at the surface were the highest among all pollution types. We also found unique features in vertical distributions of aerosols during O-3-PM(2.5)PDs; concentrations of PM2.5 decreased with altitude near the surface but remained stable at 975-819 hPa. Process analyses showed that secondary aerosols (nitrate, ammonium, and sulfate) had strong chemical productions at 913-819 hPa, which were then transported downward, resulting in the quite uniform vertical profiles at 975-819 hPa on O-3-PM(2.5)PDs. The weather patterns for O-3-PM(2.5)PDs were characterized by anomalous high-pressure system at 500 hPa as well as strong southerlies and high RH at 850 hPa. The latter resulted in the strong chemical productions around 850 hPa on O-3-PM(2.5)PDs. The physical and chemical characteristics of O-3-PM(2.5)PDs are quite different from those of polluted days by either O-3 alone or PM2.5 alone and have important implications for air quality management.
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:000906729900001
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/273062
作者单位	Nanjing University of Information Science & Technology; China Meteorological Administration
推荐引用方式 GB/T 7714	Dai, Huibin,Liao, Hong,Li, Ke,et al. Composited analyses of the chemical and physical characteristics of co-polluted days by ozone and PM2.5 over 2013-2020 in the Beijing-Tianjin-Hebei region[J],2023,23(1):17.
APA	Dai, Huibin.,Liao, Hong.,Li, Ke.,Yue, Xu.,Yang, Yang.,...&Jiang, Xingwen.(2023).Composited analyses of the chemical and physical characteristics of co-polluted days by ozone and PM2.5 over 2013-2020 in the Beijing-Tianjin-Hebei region.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(1),17.
MLA	Dai, Huibin,et al."Composited analyses of the chemical and physical characteristics of co-polluted days by ozone and PM2.5 over 2013-2020 in the Beijing-Tianjin-Hebei region".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.1(2023):17.