Aerosol demasking enhances climate warming over South Asia.
NPJ Clim Atmos Sci
; 6(1): 39, 2023.
Article
Dans Anglais
| MEDLINE | ID: covidwho-2325149
ABSTRACT
Anthropogenic aerosols mask the climate warming caused by greenhouse gases (GHGs). In the absence of observational constraints, large uncertainties plague the estimates of this masking effect. Here we used the abrupt reduction in anthropogenic emissions observed during the COVID-19 societal slow-down to characterize the aerosol masking effect over South Asia. During this period, the aerosol loading decreased substantially and our observations reveal that the magnitude of this aerosol demasking corresponds to nearly three-fourths of the CO2-induced radiative forcing over South Asia. Concurrent measurements over the northern Indian Ocean unveiled a ~7% increase in the earth's surface-reaching solar radiation (surface brightening). Aerosol-induced atmospheric solar heating decreased by ~0.4 K d-1. Our results reveal that under clear sky conditions, anthropogenic emissions over South Asia lead to nearly 1.4 W m-2 heating at the top of the atmosphere during the period March-May. A complete phase-out of today's fossil fuel combustion to zero-emission renewables would result in rapid aerosol demasking, while the GHGs linger on.
Texte intégral:
Disponible
Collection:
Bases de données internationales
Base de données:
MEDLINE
Type d'étude:
Étude observationnelle
/
Étude pronostique
Les sujets:
Covid long
langue:
Anglais
Revue:
NPJ Clim Atmos Sci
Année:
2023
Type de document:
Article
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