globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117141
Title:
Mixing state and light absorption enhancement of black carbon aerosols in summertime Nanjing, China
Author: Ma Y.; Huang C.; Jabbour H.; Zheng Z.; Wang Y.; Jiang Y.; Zhu W.; Ge X.; Collier S.; Zheng J.
Source Publication: Atmospheric Environment
ISSN: 1352-2310
Publishing Year: 2020
Volume: 222
Language: 英语
Keyword: Atmospheric aerosols ; Atmospheric radiation ; Carbon ; Fog ; Light absorption ; Mixing ; Nitrates ; Nitrogen oxides ; Optical properties ; Absorption enhancement ; Black carbon ; Mixing state ; Particulate nitrate ; Yangtze river delta ; Particles (particulate matter) ; ammonia ; ammonium nitrate ; black carbon ; nitrate ; absorption ; aerosol ; black carbon ; chemical composition ; concentration (composition) ; light intensity ; nitrate ; radiative forcing ; summer ; traffic emission ; aerosol ; China ; circadian rhythm ; environmental temperature ; light absorption ; meteorology ; particle size ; priority journal ; radiative forcing ; visibility ; China ; Nanjing [Jiangsu] ; Yangtze River
Subject Area: Absorption enhancement ; Black carbon ; Mixing state ; Particulate nitrate ; Yangtze river delta
Abstract: Direct in-situ measurements of aerosol mixing state, optical properties, and chemical composition were performed in summertime of 2014 at Nanjing, China. Aerosols were predominantly internally mixed, with an average effective density of 1.30–1.63 g cm−3 for 50–230 nm particles, increasing with size. Externally mixed, relatively fresh black carbon (BC) was only episodically observed, with a second mode peaking at 0.51–0.91 g cm−3. For particles of 110, 140, 185 and 230 nm, BC accounted for 1.7 ± 1.2%, 4.8 ± 3.0%, 5.3 ± 3.3%, and 5.1 ± 3.3% of the particle mass, while being present in 26.4 ± 5.3%, 58.1 ± 27.7%, 59.8 ± 25.4%, and 62.4 ± 27.9% of the particle number concentration, indicating that BC was heavily coated and may contribute significantly to atmospheric aerosol population. Substantial BC absorption enhancement was observed with Eabs of 1.41 ± 0.39, 1.42 ± 0.40 and 1.35 ± 0.38 at 405, 532 and 781 nm, respectively. High volatile aerosol components, in particular nitrate, were found to play vital roles in BC's absorption enhancement. High Eabs values were associated with elevated NOx and RH. A clear diurnal pattern was observed for Eabs supporting a significant impact from traffic emissions, which stood in contrast with previous studies reporting very thin coating and negligible absorption enhancement for traffic emitted BC. High concentrations of NOx co-emitted with BC from traffic sources and its conversion to particulate nitrate likely contributed to the aging and increased absorption of BC particles, which was even enhanced under high RH above the deliquescence point of ammonium nitrate. Therefore, our results indicated that the mitigation of NOx emissions from traffic was critical for reducing the positive radiative forcing induced by BC, especially under high RH conditions. © 2019 Elsevier Ltd
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被引频次[WOS]:7   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/160607
Appears in Collections:气候变化与战略

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Affiliation: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing, 210044, China; NUIST Reading Academy, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Department of Environmental Toxicology, University of California, Davis, CA 95616, United States

Recommended Citation:
Ma Y.,Huang C.,Jabbour H.,et al. Mixing state and light absorption enhancement of black carbon aerosols in summertime Nanjing, China[J]. Atmospheric Environment,2020-01-01,222
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