气候变化领域集成服务门户(CCPortal): Atmospheric Boundary Layer—Free Troposphere Air Exchange in the North China Plain and its Impact on PM2.5 Pollution

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DOI	10.1029/2021JD034641
	Atmospheric Boundary Layer—Free Troposphere Air Exchange in the North China Plain and its Impact on PM2.5 Pollution
	Jin X.; Cai X.; Huang Q.; Wang X.; Song Y.; Zhu T.
发表日期	2021
ISSN	2169897X
卷号	126 期号:9
英文摘要	This study presents the first climatology of the atmospheric boundary layer (ABL)—free troposphere (FT) exchange during wintertime in a region covering the North China Plain (NCP) and further discusses its impact on PM2.5 pollution. The exchange flux is calculated based on a mass budget equation using the simulated meteorological field from 2013 to 2019. The mean ABL-FT exchange is well related to topography and sea-land distribution, manifesting as strong downward flux over the western/northwestern mountains, moderate exchange along the eastern coastline, and small upward flux over the NCP. Eight weather types are classified to analyze the synoptic influence on ABL-FT exchange. Strong exchanges exist under the types of “low pressure trough,” “cold front,” and “high pressure” (about 63% of total days), characterized by the downward spatial mean flux of 0.019–0.026 kg m−2 s−1 over the whole research domain. But over the plain area, upward transport is dominant with the air flux from 0.004 to 0.013 kg m−2 s−1 under the first two weather types (about 32% of total days), corresponding to PM2.5 fluxes estimated in the range 0.30–0.54 μg m−2 s−1. This indicates the NCP being an effective pollution source for long-range transport. We also find that weather types with large downward flux and straightforward winds can refresh the underneath ABL air in about 6 h, which explains the dispersion of air pollution. A typical pollution case illustrates convergence and uplift to the FT of the pollutants in the NCP and the possible influence on downstream air quality. © 2021. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185259
作者单位	College of Environmental Sciences and Engineering, State Key Lab of Environmental Simulation and Pollution Control, Peking University, Beijing, China; Institute of Urban Meteorology, China Meteorological Administration, Beijing, China
推荐引用方式 GB/T 7714	Jin X.,Cai X.,Huang Q.,等. Atmospheric Boundary Layer—Free Troposphere Air Exchange in the North China Plain and its Impact on PM2.5 Pollution[J],2021,126(9).
APA	Jin X.,Cai X.,Huang Q.,Wang X.,Song Y.,&Zhu T..(2021).Atmospheric Boundary Layer—Free Troposphere Air Exchange in the North China Plain and its Impact on PM2.5 Pollution.Journal of Geophysical Research: Atmospheres,126(9).
MLA	Jin X.,et al."Atmospheric Boundary Layer—Free Troposphere Air Exchange in the North China Plain and its Impact on PM2.5 Pollution".Journal of Geophysical Research: Atmospheres 126.9(2021).