气候变化领域集成服务门户(CCPortal): Land use and anthropogenic heat modulate ozone by meteorology: a perspective from the Yangtze River Delta region

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DOI	10.5194/acp-22-1351-2022
	Land use and anthropogenic heat modulate ozone by meteorology: a perspective from the Yangtze River Delta region
	Zhan, Chenchao; Xie, Min
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	1351
结束页码	1371
卷号	22 期号:2 页码:21
英文摘要	With the rapid advance in urbanization, land use and anthropogenic heat (AH) dictated by human activities significantly modify the urban climate and in turn the air quality. Focusing on the Yangtze River Delta (YRD) region, a highly urbanized coastal area with severe ozone (O-3) pollution, we estimate the impacts of land use and AH on meteorology and O-3 using the Weather Research and Forecasting model coupled to Chemistry (WRF-Chem). These results enhance our understanding of the formation of O-3 pollution in rapidly developing city clusters with place-specific topography, as most of our results can be supported by previous studies conducted in other regions around the world. Regional O-3 pollution episodes occurred frequently (similar to 26 times per year) in the YRD from 2015 to 2019. These O-3 pollution episodes are usually in calm conditions characterized by high temperature (over 20 degrees C), low relative humidity (less than 80 %), light wind (less than 3 m s(-1)) and shallow cloud cover (less than 5 okta). In this case, O-3 pollution belts tend to appear in the converging airflows associated with the sea and the lake breezes. On the other hand, rapid urbanization has significantly changed land use and AH in this region, which subsequently affects meteorology and O-3 concentration. The largest change in land use comes from urban expansion, which causes an increase in 2m temperature (T-2) by a maximum of 3 degrees C, an increase in planetary boundary layer height (PBLH) by a maximum of 500 m, a decrease in 10 m wind speed (WS10) by a maximum of 1.5 m s(-1) and an increase in surface O-3 by a maximum of 20 mu g m(-3). With regard to the sea and lake breezes, the expansion of coastal cities, like Shanghai, can enhance the sea breeze circulation by similar to 1 m s(-1). During the advance of the sea breeze front inland, the updraft induced by the front causes strong vertical mixing of 03. However, once the sea breeze is fully developed in the afternoon (similar to 17:00 LT), further progression inland will stall. Then O-3 removal by the low sea breeze will be weakened, and surface O-3 can be 10 mu g m(-3) higher in the case with cities than in the case with no cities. The expansion of lakeside cities, such as Wuxi and Suzhou, can extend the lifetime of lake breezes from noon to afternoon. Since the offshore flow of the lake breeze transports high O-3 from the land to the lake, the onshore flow brings high O-3 back to the land. Surface O-3 in lakeside cities can increase by as much as 30 mu g m(-3). Compared to land use, the effects of AH are relatively small. The changes mainly appear in and around cities where AH fluxes are large. There are increases in T-2, PBLH, WS10 and surface O-3 when AH fluxes are taken into account, with increments of approximately 0.2 degrees C, 75 m, 0.3 m s(-1) and 4 mu g m(-3), respectively. AH contributes largely to the urban environment, altering meteorological factors, O-3 concentration and urban breeze circulation, but its effect on the sea and the lake breezes seems to be limited.
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:000751068000001
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/273309
作者单位	Nanjing University
推荐引用方式 GB/T 7714	Zhan, Chenchao,Xie, Min. Land use and anthropogenic heat modulate ozone by meteorology: a perspective from the Yangtze River Delta region[J],2022,22(2):21.
APA	Zhan, Chenchao,&Xie, Min.(2022).Land use and anthropogenic heat modulate ozone by meteorology: a perspective from the Yangtze River Delta region.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(2),21.
MLA	Zhan, Chenchao,et al."Land use and anthropogenic heat modulate ozone by meteorology: a perspective from the Yangtze River Delta region".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.2(2022):21.