Exploring the Variation of Black and Brown Carbon During COVID-19 Lockdown in Megacity Wuhan and Its Surrounding Cities, China

Overview

Journal Sci Total Environ

Date 2021 Aug 20

PMID 34412400

Citations 2

Authors

Qinglu Wang

Lili Wang

Minghui Tao

Nan Chen

Yali Lei

Yang Sun

Jinyuan Xin

Tingting Li

Jingxiang Zhou

Jingda Liu

Dongsheng Ji

Yuesi Wang

Affiliations

Soon will be listed here.

Abstract

Absorbing carbonaceous aerosols, i.e. black and brown carbon (BC and BrC), affected heavily on climate change, regional air quality and human health. The nationwide lockdown measures in 2020 were performed to against the COVID-19 outbreak, which could provide an important opportunity to understand their variations on light absorption, concentrations, sources and formation mechanism of carbonaceous aerosols. The BC concentration in Wuhan megacity (WH) was 1.9 μg m during lockdown, which was 24% lower than those in the medium-sized cities and 26% higher than those in small city; in addition, 39% and 16-23% reductions occurred compared with the same periods in 2019 in WH and other cities, respectively. Fossil fuels from vehicles and industries were the major contributors to BC; and compared with other periods, minimum contribution (64-86%) mainly from fossil fuel to BC occurred during the lockdown in all cities. Secondary BrC (BrCsec) played a major role in the BrC light absorption, accounting for 65-77% in WH during different periods. BrCsec was promoted under high humidity, and decreased through the photobleaching of chromophores under higher Ox. Generally, the lockdown measures reduced the BC concentrations significantly; however, the variation of BrCsec was slight.

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