East Asian summer monsoon enhanced by COVID-19.
Anthropogenic aerosols
COVID-19 pandemic
East Asian summer monsoon
External forcing
Internal variability
Journal
Climate dynamics
ISSN: 0930-7575
Titre abrégé: Clim Dyn
Pays: Germany
ID NLM: 101625237
Informations de publication
Date de publication:
2022
2022
Historique:
received:
01
11
2021
accepted:
07
03
2022
pubmed:
7
4
2022
medline:
7
4
2022
entrez:
6
4
2022
Statut:
ppublish
Résumé
Anthropogenic emissions decreased dramatically during the COVID-19 pandemic, but its possible effect on monsoon is unclear. Based on coupled models participating in the COVID Model Intercomparison Project (COVID-MIP), we show modeling evidence that the East Asian summer monsoon (EASM) is enhanced by 2.2% in terms of precipitation and by 5.4% in terms of the southerly wind at lower troposphere, and the amplitude of the forced response reaches about 1/3 of the standard deviation for interannual variability. The enhanced EASM during COVID-19 pandemic is a fast response to reduced aerosols, which is confirmed by the simulated response to the removal of all anthropogenic aerosols. The observational evidence, i.e., the anomalously strong EASM observed in 2020 and 2021, also supports the simulated enhancement of EASM. The essential mechanism for the enhanced EASM in response to COVID-19 is the enhanced zonal thermal contrast between Asian continent and the western North Pacific in the troposphere, due to the reduced aerosol concentration over Asian continent and the associated latent heating feedback. As the enhancement of EASM is a fast response to the reduction in aerosols, the effect of COVID-19 on EASM dampens soon after the rebound of emissions based on the models participating in COVID-MIP. The online version contains supplementary material available at 10.1007/s00382-022-06247-8.
Identifiants
pubmed: 35382257
doi: 10.1007/s00382-022-06247-8
pii: 6247
pmc: PMC8969407
doi:
Types de publication
Journal Article
Langues
eng
Pagination
2965-2978Informations de copyright
© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022.
Déclaration de conflit d'intérêts
Conflict of interestThe authors declare no conflicts of interest or competing interests.
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