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Modeling Analysis of the Seasonal Characteristics of Haze Formation in Beijing : Volume 13, Issue 11 (21/11/2013)

By Han, X.

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Book Id: WPLBN0003996535
Format Type: PDF Article :
File Size: Pages 36
Reproduction Date: 2015

Title: Modeling Analysis of the Seasonal Characteristics of Haze Formation in Beijing : Volume 13, Issue 11 (21/11/2013)  
Author: Han, X.
Volume: Vol. 13, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Zhang, M., Han, X., Chai, F., Gao, J., & Wang, S. (2013). Modeling Analysis of the Seasonal Characteristics of Haze Formation in Beijing : Volume 13, Issue 11 (21/11/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, HuaYanBeiLi 40{#} Chaoyang District, Beijing 100029, China. The air quality modeling system RAMS-CMAQ coupled with an aerosol optical property scheme was applied to simulate the meteorological field, major aerosol components (sulfate, nitrate, ammonium, black carbon, organic carbon, dust, and sea salt), and surface visibility over the North China Plain (NCP) in 2011. The modeled results in February and July 2011 were selected and analyzed to obtain an in-depth understanding of the haze formation mechanism in Beijing in different seasons. The evaluations suggested that the modeling system provided reliable simulation results of meteorological factors (temperature, relative humidity, and wind field), visibility, mass concentrations of gaseous pollutants (NO2 and O3), and major aerosol components in PM2.5 by compared with various observation data at several measurement stations over NCP. The simulation results showed that the visibility below 10 km covered most regions of NCP and dropped below 5 km over the urban areas of Beijing, Tianjin, and Shijiazhuang during the pollution episodes in February and July. The heavy particulate pollutants were concentrated in the same areas as well. The heavy loading of PM2.5 which could reach 300 μg m−3 in Beijing should be the main reason of haze occurrence in February, and the visibility generally decreased to 3–5 km when the mass concentration of PM2.5 exceeded 200 μg m−3. However, similar values of visibility also appeared in July when the mass concentration of PM2.5 was merely in the range of 120 μg m−3 to 200 μg m−3. Analysis presented that nitrate, sulfate, and ammonium were the three major aerosol components in Beijing and their total mass burden was even higher in July than that in February. Thus, the significantly higher relative humidity and larger mass proportion of soluble aerosol components resulted in more haze days in July. Sensitivity test shows that the mass concentration threshold of PM2.5 to cause haze occurrence was about 80 μg m−3 when the relative humidity was 70% in Beijing. The change of aerosol size distribution can significantly influence the threshold of haze occurrence in Beijing, particularly for particles of smaller size.

Summary
Modeling analysis of the seasonal characteristics of haze formation in Beijing

Excerpt
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