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Mixing State, Composition, and Sources of Fine Aerosol Particles in the Qinghai-tibetan Plateau and the Influence of Agricultural Biomass Burning : Volume 15, Issue 17 (08/09/2015)

By Li, W. J.

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Book Id: WPLBN0004023495
Format Type: PDF Article :
File Size: Pages 33
Reproduction Date: 2015

Title: Mixing State, Composition, and Sources of Fine Aerosol Particles in the Qinghai-tibetan Plateau and the Influence of Agricultural Biomass Burning : Volume 15, Issue 17 (08/09/2015)  
Author: Li, W. J.
Volume: Vol. 15, Issue 17
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Wang, W. X., Sun, Y. L., Li, W. J., Chen, J. M., Xu, Y. S., Yang, X. Y.,...Zhao, X. D. (2015). Mixing State, Composition, and Sources of Fine Aerosol Particles in the Qinghai-tibetan Plateau and the Influence of Agricultural Biomass Burning : Volume 15, Issue 17 (08/09/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Environment Research Institute, Shandong University, 250100, Jinan, China. Transmission electron microscopy (TEM) was employed to obtain morphology, size, composition, and mixing state of background fine particles with diameter less than 1 Μm in the Qinghai-Tibetan Plateau (QTP) during 15 September to 15 October 2013. Individual aerosol particles mainly contained secondary inorganic aerosols (SIA-sulfate and nitrate) and organics during clean periods (PM2.5: particles less than 2.5 Μg m−3). The presence of KCl-NaCl associated with organics and an increase of soot particles suggest that an intense biomass burning event caused the highest PM2.5 concentrations (> 30 Μg m−3) during the study. A large number fraction of the fly ash-containing particles (21.73 %) suggests that coal combustion emissions in the QTP significantly contributed to air pollutants at the median pollution level (PM2.5: 10–30 Μg m−3). We concluded that emissions from biomass burning and from coal combustion both constantly contribute to anthropogenic particles in the QTP atmosphere. Based on size distributions of individual particles in different pollution levels, we found that gas condensation on existing particles is an important chemical process for the formation of SIA with organic coating. TEM observations show that refractory aerosols (e.g., soot, fly ash, and visible organic particles) likely adhere to the surface of SIA particles larger than 200 nm due to coagulation. Organic coating and soot on surface of the aged particles likely influence their hygroscopic and optical properties in the QTP, respectively. To our knowledge, this study reports the first microscopic analysis of fine particles in the background QTP air.

Summary
Mixing state, composition, and sources of fine aerosol particles in the Qinghai-Tibetan Plateau and the influence of agricultural biomass burning

Excerpt
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