Decrease of atmospheric black carbon and CO₂ concentrations due to COVID-19 lockdown at the Mt. Waliguan WMO/GAW baseline station in China.

ABSTRACT: The Coronavirus Disease 2019 (COVID-19) lockdown policy reduced anthropogenic emissions and impacted the atmospheric chemical characteristics in Chinese urban cities. However, rare studies were conducted at the high mountain site. In this work, in-situ measurements of light absorption by carbonaceous aerosols and carbon dioxide (CO₂) concentrations were conducted at Waliguan (WLG) over the northeastern Tibetan Plateau of China from January 3 to March 30, 2020. The data was employed to explore the influence of the COVID-19 lockdown on atmospheric chemistry in the background-free troposphere. During the sampling period, the light absorption near-infrared (>470 nm) was mainly contributed by BC (>72%), however, BC and brown carbon (BrC) contributed equally to light absorption in the

SUBMITTER: Xie F 

PROVIDER: S-EPMC8887961 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature