气候变化领域集成服务门户(CCPortal): The effect of BC on aerosol-boundary layer feedback: potential implications for urban pollution episodes

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DOI	10.5194/acp-22-2937-2022
	The effect of BC on aerosol-boundary layer feedback: potential implications for urban pollution episodes
	Slater, Jessica; Coe, Hugh; McFiggans, Gordon; Tonttila, Juha; Romakkaniemi, Sami
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2937
结束页码	2953
卷号	22 期号:4 页码:17
英文摘要	Beijing suffers from poor air quality, particularly during wintertime haze episodes when concentrations of PM2.5 (particulate matter with a diameter < 2.5 mu m) can peak at > 400 mu g m(-3). Black carbon (BC), an aerosol which strongly absorbs solar radiation, can make up to 10 % of PM2.5 in Beijing. BC is of interest due to its climatic and health impacts. BC has also been found to impact planetary boundary layer (PBL) meteorology. Through interacting with radiation and altering the thermal profile of the lower atmosphere, BC can either suppress or enhance PBL development depending on the properties and altitude of the BC layer. Previous research assessing the impact of BC on PBL meteorology has been investigated through the use of regional models, which are limited both by resolution and the chosen boundary layer schemes. In this work, we apply a high-resolution model (UCLALES-SALSA) that couples an aerosol and radiative transfer model with large-eddy simulation (LES) to quantify the impact of BC at different altitudes on PBL dynamics using conditions from a specific haze episode which occurred from 1-4 December 2016 in Beijing. Results presented in this paper quantify the heating rate of BC at various altitudes to be between 0.01 and 0.016 K/h per mu g/m(3) of BC, increasing with altitude but decreasing around PBL top. Through utilising a high-resolution model which explicitly calculates turbulent dynamics, this paper showcases the impact of BC on PBL dynamics both within and above the PBL. These results show that BC within the PBL increases maximum PBL height by 0.4 % but that the same loading of BC above the PBL can suppress PBL height by 6.5 %. Furthermore, when BC is present throughout the column, the impact of BC suppressing PBL development is further maximised, with BC causing a 17 % decrease in maximum PBL height compared to only scattering aerosols. Assessing the impact of these opposite effects, in this paper, we present a mechanism through which BC may play a prominent role in the intensity and longevity of Beijing's pollution episodes.
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:000766511600001
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/273652
作者单位	University of York - UK; University of Manchester; Finnish Meteorological Institute
推荐引用方式 GB/T 7714	Slater, Jessica,Coe, Hugh,McFiggans, Gordon,et al. The effect of BC on aerosol-boundary layer feedback: potential implications for urban pollution episodes[J],2022,22(4):17.
APA	Slater, Jessica,Coe, Hugh,McFiggans, Gordon,Tonttila, Juha,&Romakkaniemi, Sami.(2022).The effect of BC on aerosol-boundary layer feedback: potential implications for urban pollution episodes.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(4),17.
MLA	Slater, Jessica,et al."The effect of BC on aerosol-boundary layer feedback: potential implications for urban pollution episodes".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.4(2022):17.