Characteristics of carbonaceous aerosols in ambient PM2.5 during the COVID-19 period in Nanjing

Q3 Social Sciences 生态与农村环境学报 Pub Date : 2021-01-01 DOI:10.19741/j.issn.1673-4831.2020.0857

Y. Ji, Q. Y. Zhao, F. Chen, D. Chen

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引用次数: 1

Abstract

In order to explore the variations of carbon components[including organic carbon (OC) and element carbon (EC)] in PM2.5 at the urban area of Nanjing during the breakout of COVID-19 period, PM2.5, OC and EC mass concentrations were measured by online monitoring from January to February 2020. Compared to the concentrations before the emergency response, the PM2.5 concentration after the emergency response was reduced by 41.2% and EC reduced by 57.9%. These results indicate that the shutdown significantly reduced PM2.5 and EC concentrations, but the OC concentration increased. Before the emergency response, the OC and EC concentrations were low in daytime and high at night and early morning. After the emergency response, the average concentration of EC only had a slight change within a day and maintained at low concentration level, OC showed a curve trend which was higher in the afternoon and lower in morning and evening. The significant decrease of PM2.5 concentration after the emergency response period led to the increasing of light radiation intensity, which promoted the formation of secondary organic carbon (SOC). The SOC concentration increased when the PM2.5 and EC concentrations decreased, and the correlation between OC and EC also decreased significantly. © 2021, China Environmental Science Press. All rights reserved.

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新冠肺炎疫情期间南京市PM2.5中碳质气溶胶特征

为探讨新冠肺炎疫情暴发期间南京市城区PM2.5中碳组分[包括有机碳(OC)和元素碳(EC)]的变化情况，于2020年1 - 2月采用在线监测方法测定了PM2.5、有机碳和元素碳的质量浓度。与应急前相比，应急后PM2.5浓度降低了41.2%，EC降低了57.9%。这些结果表明，关闭显著降低了PM2.5和EC浓度，但OC浓度升高。应急响应前，OC和EC浓度白天较低，夜间和清晨较高。应急响应后，EC的平均浓度在一天内变化不大，维持在较低浓度水平，OC呈下午高、早晚低的曲线趋势。应急响应期后PM2.5浓度显著下降，导致光辐射强度增加，促进了次生有机碳(SOC)的形成。随着PM2.5和EC浓度的降低，SOC浓度升高，OC与EC的相关性也显著降低。©2021，中国环境科学出版社版权所有。

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来源期刊

生态与农村环境学报 Social Sciences-Development

CiteScore

1.90

自引率

0.00%

发文量

3962

期刊介绍： Journal of Ecology and Rural Environment is a national academic journal supervised by the Ministry of Ecology and Environment and sponsored by the Nanjing Institute of Environmental Science of the Ministry of Ecology and Environment. Founded in 1985, it is openly circulated in the form of a monthly journal. The journal is dedicated to reporting the innovative achievements in the field of ecology and rural environmental protection in a timely manner, and has become an important platform for academic exchanges in this field. As a journal included in the Chinese Core Journals List, as well as the core journals of China Science Citation Database (CSCD) and Research Report on the Evaluation of China's Academic Journals (RCCSE), it has been widely included in a number of important databases both at home and abroad, such as CNKI-CAJD, COJ, CSTPCD, Wanfang, and Wipro, etc., as well as the internationally renowned BP, BIOSIS, CA, CAB ABSTRACTS, CABI, EBSCO, GEOBASE, SCOPUS and so on. The main columns of the Journal of Ecology and Rural Environment include Research Reports, Research Briefs, Research Methods, Monographs and Reviews, Academic Discussions and Suggestions, etc., covering a wide range of areas including Regional Environment and Development, Nature Conservation and Ecology, Pollution Control and Remediation, etc., which provide valuable information resources and academic support for researchers, educators and policy makers in related fields. The journal has won a number of honours, including National Outstanding Environmental Science and Technology Journal, Jiangsu Outstanding Journal, Jiangsu ‘Top Ten Science and Technology Journals’, etc., and has certain influence and authority in the academic circle.