East Asian climate response to COVID-19 lockdown measures in China

Abstract The COVID-19 pandemic caused disruptions of public life and imposed lockdown measures in 2020 resulted in considerable reductions of anthropogenic aerosol emissions. It still remains unclear how the associated short-term changes in atmospheric chemistry influenced weather and climate on reg...

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Autores principales:	Sun-Seon Lee, Jung-Eun Chu, Axel Timmermann, Eui-Seok Chung, June-Yi Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/21f626bc169d41aba7330c3ce9921aaf
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id	oai:doaj.org-article:21f626bc169d41aba7330c3ce9921aaf
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spelling	oai:doaj.org-article:21f626bc169d41aba7330c3ce9921aaf2021-12-02T15:10:46ZEast Asian climate response to COVID-19 lockdown measures in China10.1038/s41598-021-96007-12045-2322https://doaj.org/article/21f626bc169d41aba7330c3ce9921aaf2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96007-1https://doaj.org/toc/2045-2322Abstract The COVID-19 pandemic caused disruptions of public life and imposed lockdown measures in 2020 resulted in considerable reductions of anthropogenic aerosol emissions. It still remains unclear how the associated short-term changes in atmospheric chemistry influenced weather and climate on regional scales. To understand the underlying physical mechanisms, we conduct ensemble aerosol perturbation experiments with the Community Earth System Model, version 2. In the simulations reduced anthropogenic aerosol emissions in February generate anomalous surface warming and warm-moist air advection which promotes low-level cloud formation over China. Although the simulated response is weak, it is detectable in some areas, in qualitative agreement with the observations. The negative dynamical cloud feedback offsets the effect from reduced cloud condensation nuclei. Additional perturbation experiments with strongly amplified air pollution over China reveal a nonlinear sensitivity of regional atmospheric conditions to chemical/radiative perturbations. COVID-19-related changes in anthropogenic aerosol emissions provide an excellent testbed to elucidate the interaction between air pollution and climate.Sun-Seon LeeJung-Eun ChuAxel TimmermannEui-Seok ChungJune-Yi LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sun-Seon Lee Jung-Eun Chu Axel Timmermann Eui-Seok Chung June-Yi Lee East Asian climate response to COVID-19 lockdown measures in China
description	Abstract The COVID-19 pandemic caused disruptions of public life and imposed lockdown measures in 2020 resulted in considerable reductions of anthropogenic aerosol emissions. It still remains unclear how the associated short-term changes in atmospheric chemistry influenced weather and climate on regional scales. To understand the underlying physical mechanisms, we conduct ensemble aerosol perturbation experiments with the Community Earth System Model, version 2. In the simulations reduced anthropogenic aerosol emissions in February generate anomalous surface warming and warm-moist air advection which promotes low-level cloud formation over China. Although the simulated response is weak, it is detectable in some areas, in qualitative agreement with the observations. The negative dynamical cloud feedback offsets the effect from reduced cloud condensation nuclei. Additional perturbation experiments with strongly amplified air pollution over China reveal a nonlinear sensitivity of regional atmospheric conditions to chemical/radiative perturbations. COVID-19-related changes in anthropogenic aerosol emissions provide an excellent testbed to elucidate the interaction between air pollution and climate.
format	article
author	Sun-Seon Lee Jung-Eun Chu Axel Timmermann Eui-Seok Chung June-Yi Lee
author_facet	Sun-Seon Lee Jung-Eun Chu Axel Timmermann Eui-Seok Chung June-Yi Lee
author_sort	Sun-Seon Lee
title	East Asian climate response to COVID-19 lockdown measures in China
title_short	East Asian climate response to COVID-19 lockdown measures in China
title_full	East Asian climate response to COVID-19 lockdown measures in China
title_fullStr	East Asian climate response to COVID-19 lockdown measures in China
title_full_unstemmed	East Asian climate response to COVID-19 lockdown measures in China
title_sort	east asian climate response to covid-19 lockdown measures in china
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/21f626bc169d41aba7330c3ce9921aaf
work_keys_str_mv	AT sunseonlee eastasianclimateresponsetocovid19lockdownmeasuresinchina AT jungeunchu eastasianclimateresponsetocovid19lockdownmeasuresinchina AT axeltimmermann eastasianclimateresponsetocovid19lockdownmeasuresinchina AT euiseokchung eastasianclimateresponsetocovid19lockdownmeasuresinchina AT juneyilee eastasianclimateresponsetocovid19lockdownmeasuresinchina
_version_	1718387678793170944

East Asian climate response to COVID-19 lockdown measures in China

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