Sujet
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, [SDU]Sciences of the Universe [physics]

Domaines
Sciences de la Terre, Climatologie, Sciences de l'environnement

Description

POPS measurements have to be re-425quested from the PI (gwenael.berthet@cnrs-orleans.fr) International audience During an extended volcanic unrest starting in 2017, two main moderate stratospheric eruptions occurred at the Ambae volcano (15°S and 167°E), Vanuatu, in April and July 2018. Observations from a geostationary orbit show that the April and July eruptions injected a volcanic plume into the lower stratosphere. While aerosol enhancements from the April eruption have only had an impact on the Southern Hemisphere, the plume from the July eruption was distributed within the lower branch of the Brewer–Dobson circulation to both hemispheres. Satellite, ground‐based and in situ observations show that the background aerosol is enhanced throughout the year after the July eruption on a global scale. A volcanic‐induced perturbation of the global stratospheric aerosol optical depth up to 0.011 is found, in the ultraviolet/visible spectral range. This perturbation is comparable to that of recent moderate stratospheric eruptions like from Kasatochi, Sarychev, and Nabro. Top of the atmosphere radiative forcing values are estimated between −0.45 and −0.6 W/m2 for this event, showing that the Ambae eruption had the strongest climatic impact of the year 2018. Thus, the Ambae eruption in 2018 has to be taken into account when studying the decadal lower stratospheric aerosol budget and in climate studies.

Mots-clés

Langue
English (en-GB)

Auteurs
Kloss, Corinna, Sellitto, Pasquale, Legras, Bernard, Vernier, Jean-Paul, Jegou, Fabrice, Venkat ratnam, M., Suneel Kumar, B., Lakshmi Madhavan, B., Berthet, Gwenaël

Contributeurs
Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) ; Observatoire des Sciences de l'Univers en région Centre (OSUC) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) ; Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris ; École normale supérieure - Paris (ENS-PSL) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), ANR-17-CE01-0015,TTL-Xing,La Couche de la Tropopause Tropicale pendant la mousson d'Asie: transport et composition(2017)

Sources
ISSN: 2169-897X, EISSN: 2169-8996, Journal of Geophysical Research: Atmospheres, https://hal.archives-ouvertes.fr/hal-03017697, Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2020, 125 (14), pp.e2020JD032410. ⟨10.1029/2020JD032410⟩

Relation
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020JD032410

Couverture
Vanuatu

Nom du journal