Spatio-temporal Distribution Characteristics of Secondary Aerosol in Beijing-Tianjin-Hebei Urban Agglomeration in Winter

被引：3

作者：

Yao Q. ^{[1
,2
]}

Yang X. ^{[1
,2
]}

Tang Y.-X. ^{[1
,2
]}

Fan W.-Y. ^{[1
,2
]}

Cai Z.-Y. ^{[1
,2
]}

Han S.-Q. ^{[1
,2
]}

机构：

[1] Tianjin Environmental Meteorology Center, Tianjin

[2] CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin

来源：

Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 05期

关键词：

Beijing-Tianjin-Hebei urban agglomeration; ozone(O[!sub]3[!/sub] ); photochemical reaction; secondary aerosol; temporal and spatial distribution;

D O I：

10.13227/j.hjkx.202205221

中图分类号：

学科分类号：

摘要：

The secondary component is an important factor causing PM2. 5 pollution in the Beijing-Tianjin-Hebei urban agglomeration in winter. In this study, the CO tracer method was used to estimate the secondary PM2. 5 concentration of the Beijing-Tianjin-Hebei urban agglomeration in the winter of 2017- 2021. The temporal and spatial distribution characteristics were analyzed, and the influencing factors of regional secondary PM2. 5 were discussed. The results showed that the decreasing trend of PM2. 5 concentration in the Beijing-Tianjin-Hebei Region in the winter of 2017-2021 was obvious, and the cities with the largest decline were located in the central and southern part of Hebei Province, mainly contributed by primary PM2. 5 . There was a good correlation between secondary PM2. 5 and PM2. 5 in all cities of the Beijing-Tianjin-Hebei urban agglomeration, and the proportion of secondary PM2. 5 in Beijing and Tianjin was significantly higher than that in other cities. With the aggravation of pollution degree, the mass concentration of primary PM2. 5 and secondary PM2. 5 increased in varying degrees, and the proportion of secondary PM2. 5 increased significantly. Compared with the direct measurement results, the estimated value obtained by this method was lower as a whole. The selection of appropriate primary aerosol reference value was the key to improving this method and estimating the secondary PM2. 5 concentration. © 2023 Science Press. All rights reserved.

引用

页码：2421 / 2429

页数：8

共 30 条

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