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Observing the SO2 and Sulphate Aerosol Plumes from the 2022 Hunga Tonga-Hunga Ha'apai Eruption with IASI
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  • Pasquale Sellitto,
  • Richard Siddans,
  • Redha Belhadji,
  • Elisa Carboni,
  • Bernard Legras,
  • Aurélien Podglajen,
  • Clair Duchamp,
  • Brian Kerridge
Pasquale Sellitto
Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris-Est Créteil

Corresponding Author:[email protected]

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Richard Siddans
Rutherford Appleton Laboratory
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Redha Belhadji
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Elisa Carboni
University of Oxford
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Bernard Legras
CNRS - Lab Météo Dynamique
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Aurélien Podglajen
Laboratoire de météorologie dynamique, Ecole Polytechnique
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Clair Duchamp
Laboratoire de Météorologie Dynamique (LMD-IPSL)
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Brian Kerridge
Rutherford Appleton Laboratories
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The Hunga Tonga-Hunga Ha’apai volcano violently erupted on 15 January 2022, producing the largest perturbation of the stratospheric aerosol layer since Pinatubo 1991, despite the estimated modest injection of SO2. Here we present novel SO2 and sulphate aerosol (SA) co-retrievals from the Infrared Atmospheric Sounding Instrument, and use them to study the dispersion of the Hunga Tonga plume over the entire year 2022. We observe rapid conversion of SO2 (e-folding time: 17.1±0.6 days) to sulphate aerosols (SA), with an initial injected burden of >1.0 Tg. This points at larger SO2 injections than previously thought. A long-lasting SA plume was observed, with a meridional dispersion of marked anomalies from the tropics to the higher southern hemispheric latitudes. A very small SA removal is observed after 1-year dispersion. The total SA mass burden was estimated at 1.6 ± 0.1 Tg in total column, with a build-up e-folding time of about 2 months.
25 Jul 2023Submitted to ESS Open Archive
01 Aug 2023Published in ESS Open Archive