Growth and global persistence of stratospheric sulfate aerosols from the 2022 Hunga Tonga-Hunga Haápai volcanic eruption - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue (Article De Synthèse) Journal of Geophysical Research: Atmospheres Année : 2023

Growth and global persistence of stratospheric sulfate aerosols from the 2022 Hunga Tonga-Hunga Haápai volcanic eruption

Croissance et persistance à l'échelle mondiale des aérosols sulfatés stratosphériques issus de l'éruption du volcan Hunga Tonga--Hunga Haápai de 2022

Résumé

Stratospheric sulfate aerosols play a key role on atmospheric chemistry and Earth's radiation budget, but their size distribution, a critical parameter in climate models, is generally poorly known. We address such gap for the 2022 Hunga Tonga-Hunga Haapai (HT-HH) volcanic eruption by exhaustively analyzing a set of satellite observations (TROPOMI, IASI, AHI, CALIOP) together with photometric ground observations from the worldwide open-access AERONET network. We document a rapid growth of HT-HH sulfate aerosols in the days following eruption, faster than observed for 1991 Pinatubo eruption, likely due to the exceptional hydration of the stratosphere by this phreatomagmatic eruption. An unusual aerosol  fine mode (peak radius in 0.3-0.5 microns) is identified at 20 stations of the southern hemisphere until May 2023 (time of writing). Nevertheless, 1.4 years after eruption, HT-HH sulfate aerosols remain smaller than Pinatubo particles. Smaller aerosols backscatter more efficiently visible light and sediment more slowly than larger particles, implying stronger and longer-lasting negative radiative forcing.
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Dates et versions

hal-04272377 , version 1 (06-11-2023)

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Paternité - Pas d'utilisation commerciale

Identifiants

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Marie Boichu, Raphaël Grandin, Luc Blarel, Benjamin Torres, Yevgeny Derimian, et al.. Growth and global persistence of stratospheric sulfate aerosols from the 2022 Hunga Tonga-Hunga Haápai volcanic eruption. Journal of Geophysical Research: Atmospheres, inPress, ⟨10.1029/2023JD039010⟩. ⟨hal-04272377⟩
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