气候变化领域集成服务门户(CCPortal): Meteorology impact on PM2.5 change over a receptor region in the regional transport of air pollutants: observational study of recent emission reductions in central China

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DOI	10.5194/acp-22-3579-2022
	Meteorology impact on PM2.5 change over a receptor region in the regional transport of air pollutants: observational study of recent emission reductions in central China
	Sun, Xiaoyun; Zhao, Tianliang; Bai, Yongqing; Kong, Shaofei; Zheng, Huang; Hu, Weiyang; Ma, Xiaodan; Xiong, Jie
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	3579
结束页码	3593
卷号	22 期号:5 页码:15
英文摘要	As an important issue in atmospheric environment, the contributions of anthropogenic emissions and meteorological conditions to air pollution have been little assessed over receptor regions in regional transport of air pollutants. In the present study of 5-year observations and modeling, we targeted the Twain-Hu Basin (THB), a large region of heavy PM2.5 pollution in central China, to assess the effects of meteorology on PM2.5 change over a receptor region in the regional transport of air pollutants. Based on observations of environment and meteorology over 2015-2019, the Kolmogorov-Zurbenko (KZ) filter was performed to decompose the PM2.5 variations into multiple timescale components over the THB, where the short-term, seasonal and long-term components accounted for, respectively, 47.5 %, 41.4% and 3.7% of daily PM2.5 changes. The short-term and seasonal components dominated the day-to-day PM2.5 variations with long-term component determining the change trend of PM2.5 concentrations over recent years. As the emission- and meteorology-related long-term PM2.5 components over the THB were identified, the meteorological contribution to the declining PM2.5 trend presented a distinct spatial pattern over the THB with northern positive rates up to 61.92% and southern negative rates down to 24.93 %. The opposite effects of meteorology on PM2.5 ollution could accelerate and offset the effects of emission reductions in the northern and southern THB, which is attributed to the upwind diffusion and downward accumulation of air pollutants over receptor regions in regional PM2.5 transport. It is noteworthy that the increasing conversion efficiencies of SO2 and NO2 to sulfate and nitrate for secondary PM2.5 could have offset the effect of PM2.5 emission reduction on air pollution in the THB during recent years, revealing the enhancing contribution of gaseous precursor emissions to PM2.5 concentrations under control of anthropogenic emissions of PM2.5 and the gaseous precursors over receptor regions in the regional transport of air pollutants. Our results highlight the effects of emission mitigation and meteorological changes on the source-receptor relationship of the regional transport of air pollutants with the implication of long-range transport of air pollutants for regional and global environment changes.
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:000772229400001
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/273622
作者单位	China Meteorological Administration; Nanjing University of Information Science & Technology; China Meteorological Administration; China University of Geosciences
推荐引用方式 GB/T 7714	Sun, Xiaoyun,Zhao, Tianliang,Bai, Yongqing,et al. Meteorology impact on PM2.5 change over a receptor region in the regional transport of air pollutants: observational study of recent emission reductions in central China[J],2022,22(5):15.
APA	Sun, Xiaoyun.,Zhao, Tianliang.,Bai, Yongqing.,Kong, Shaofei.,Zheng, Huang.,...&Xiong, Jie.(2022).Meteorology impact on PM2.5 change over a receptor region in the regional transport of air pollutants: observational study of recent emission reductions in central China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(5),15.
MLA	Sun, Xiaoyun,et al."Meteorology impact on PM2.5 change over a receptor region in the regional transport of air pollutants: observational study of recent emission reductions in central China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.5(2022):15.