Evolution of Organic Carbon During COVID-19 Lockdown Period: Possible Contribution of Nocturnal Chemistry

Overview

Journal Sci Total Environ

Date 2021 Dec 7

PMID 34875334

Citations 6

Authors

Zemin Feng

Feixue Zheng

Yongchun Liu

Xiaolong Fan

Chao Yan

Yusheng Zhang

Kaspar R Daellenbach

Federico Bianchi

Tuukka Petaja

Markku Kulmala

Xiaolei Bao

Affiliations

Soon will be listed here.

Abstract

Carbonaceous aerosol is one of the main components of atmospheric particulate matter, which is of great significance due to its role in climate change, earth's radiation balance, visibility, and human health. In this work, carbonaceous aerosols were measured in Shijiazhuang and Beijing using the OC/EC analyzer from December 1, 2019 to March 15, 2020, which covered the Coronavirus Disease 2019 (COVID-19) pandemic. The observed results show that the gas-phase pollutants, such as NO, NO, and aerosol-phase pollutants (Primary Organic Compounds, POC) from anthropogenic emissions, were significantly reduced during the lockdown period due to limited human activities in North China Plain (NCP). However, the atmospheric oxidation capacity (Ox/CO) shows a significantly increase during the lockdown period. Meanwhile, additional sources of nighttime Secondary Organic Carbon (SOC), Secondary Organic Aerosol (SOA), and b(370 nm) are observed and ascribed to the nocturnal chemistry related to NO radical. The Potential Source Contribution Function (PSCF) analysis indicates that the southeast areas of the NCP region contributed more to the SOC during the lockdown period than the normal period. Our results highlight the importance of regional nocturnal chemistry in SOA formation.

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