Evaluation of regional background particulate matter concentration based on vertical distribution characteristics
Author:
Han S.,Zhang Y.,Wu J.,Zhang X.,Tian Y.,Wang Y.,Ding J.,Yan W.,Bi X.,Shi G.,Cai Z.,Yao Q.,Huang H.,Feng Y.
Abstract
Abstract. Heavy regional particulate matter (PM) pollution in China has resulted in an important and urgent need for joint control actions among cities. It's advisable to improve the understanding of regional background concentration of PM for the development of efficient and effective joint control policies. With the increase of vertical height the influence of source emission on local air quality is weakening, but the characteristics of regional pollution gradually become obvious. A method to estimate regional background PM concentration is proposed in this paper, based on the vertical variation periodic characteristics of the atmospheric boundary layer structure and particle mass concentration, as well as the vertical distribution of particle size, chemical composition and pollution source apportionment. According to the method, the averaged regional background PM2.5 concentration, being extracted from the original time series in Tianjin, was 40.0 ± 20.2, 63.6 ± 16.9 and 53.2 ± 11.1 μg m−3, respectively, in July, August and September.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
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