Vertical distributions of tropospheric SObased on MAX-DOAS observations: Investigating the impacts of regional transport at different heights in the boundary layer

被引：4

作者：

Qianqian Hong ^{[1
]}

Cheng Liu ^{[2
,3
,4
,5
]}

Qihou Hu ^{[3
]}

Chengzhi Xing ^{[6
]}

Wei Tan ^{[3
]}

Ting Liu ^{[6
]}

Jianguo Liu ^{[2
,3
]}

机构：

[1] School of Environment and Civil Engineering, Jiangnan University

[2] Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences

[3] Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences

[4] Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China

[5] Anhui Province Key Laboratory of Polar Environment and Global Change, University of Science and Technology of China

[6] School of Earth and Space Sciences, University of Science and Technology of China

来源：

Journal of Environmental Sciences | 2021年 / 05期

关键词：

D O I：

暂无

中图分类号：

X51 [大气污染及其防治];

学科分类号：

0706 ; 070602 ;

摘要：

Information on the vertical distribution of air pollutants is essential for understanding their spatiotemporal evolution underlying urban atmospheric environment. This paper presents the SO2 profiles based on ground-based Multi-Axis Differential Optical Absorption Spectroscopy（MAX-DOAS） measurements from March 2018 to February 2019 in Hefei, East China. SO2 decrease rapidly with increasing heights in the warm season, while lifted layers were observed in the cold season, indicating accumulation or long-range transport of SO2 in different seasons might occur at different heights. The diurnal variations of SO2 were roughly consistent for all four seasons, exhibiting the minimum at noon and higher values in the morning and late afternoon. Lifted layers of SO2 were observed in the morning for fall and winter, implying the accumulation or transport of SO2 in the morning mainly occurred at the top of the boundary layer. The bivariate polar plots showed that weighted SO2 concentrations in the lower altitude were weakly dependent on wind, but in the middle and upper altitudes, higher weighted SO2 concentrations were observed under conditions of middlehigh wind speed. Concentration weighted trajectory（CWT） analysis suggested that potential sources of SO2 in spring and summer were local and transported mainly occurred in the lower altitude from southern and eastern areas; while in fall and winter, SO2 concentrations were deeply affected by long-range transport from northwestern and northern polluted regions in the middle and upper altitudes. Our findings provide new insight into the impacts of regional transport at different heights in the boundary layer on SO2 pollution.

引用

页码：119 / 134

页数：16

共 54 条

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