Chemical and optical properties of aerosols and their interrelationship in winter in the megacity Shanghai of China

被引：12

作者：

Tingting Han ^{[1
]}

Liping Qiao ^{[2
]}

Min Zhou ^{[2
]}

Yu Qu ^{[3
]}

Jianfei Du ^{[4
]}

Xingang Liu ^{[1
]}

Shengrong Lou ^{[2
]}

Changhong Chen ^{[2
]}

Hongli Wang ^{[2
]}

Fang Zhang ^{[5
]}

Qing Yu ^{[1
]}

Qiong Wu ^{[1
]}

机构：

[1] State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University

[2] State Environmental Protection Key Laboratory of Cause and Prevention of Urban Air Pollution Complex,Shanghai Academy of Environmental Sciences

[3] State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics,Chinese Academy of Sciences

[4] Shanghai Meteorological Service

[5] College of Global Change and Earth System Science, Beijing Normal University

来源：

Journal of Environmental Sciences | 2015年 / 01期

关键词：

Optical properties; Diurnal variations; Chemical apportionment; Shanghai;

D O I：

暂无

中图分类号：

X513 [粒状污染物];

学科分类号：

0706 ; 070602 ;

摘要：

A field campaign on air quality was carried out in Shanghai in winter of 2012. The concentrations of NO, NO2, NOx, SO2, CO, and PM2.5increased during haze formation. The average masses of SO42-, NO3-and NH4+were 10.3, 11.7 and 6.7 μg/m3 during the haze episodes, which exceeded the average(9.2, 7.9, and 3.4 μg/m3) of these components in the non-haze days. The mean values for the aerosol scattering coefficient(b sp), aerosol absorption coefficient(b ap) and single scattering albedo(SSA) were 288.7, 27.7 and0.91 Mm-1, respectively. A bi-peak distribution was observed for the mass concentrations of CO, NO, NO2, and NOx. More sulfate was produced during daytime than that in the evening due to photochemical reactions. The mass concentration of NH4+achieved a small peak at noontime. NO3-showed lower concentrations in the afternoon and higher concentrations in the early morning. There were obvious bi-peak diurnal patterns for b sp and b ap as well as SSA. b sp and b ap showed a positive correlation with PM2.5mass concentration.(NH4)2SO4, NH4NO3, organic mass, elemental carbon and coarse mass accounted for 21.7%, 19.3%, 31.0%, 9.3% and 12.3% of the total extinction coefficient during non-haze days, and 25.6%, 24.3%, 30.1%, 8.1% and 8.2% during hazy days. Organic matter was the largest contributor to light extinction. The contribution proportions of ammonium sulfate and ammonium nitrate to light extinction were significantly higher during the hazy time than during the non-haze days.

引用

页码：59 / 69

页数：11

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