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Impact of the 2018 Ambae eruption on the global stratospheric aerosol layer and climate
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  • Corinna Kloss,
  • Pasquale Sellitto,
  • Bernard Legras,
  • Jean-Paul Vernier,
  • Fabrice Jegou,
  • Madineni Venkat Ratnam,
  • Suneel Kumar B,
  • B. Lakshmi Madhavan,
  • Gwenael Berthet
Corinna Kloss
Laboratoire de Physique et Chimie de l'Environment et de l'Espace (LPC2E), CNRS
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Pasquale Sellitto
Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris-Est Créteil

Corresponding Author:pasquale.sellitto@lisa.u-pec.fr

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Bernard Legras
Ecole Normale Superieure
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Jean-Paul Vernier
Science Systems and Applications, Inc.
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Fabrice Jegou
LPC2E / French National Centre for Scientific Research (CNRS)
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Madineni Venkat Ratnam
National Atmospheric Research Laboratory
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Suneel Kumar B
Balloon Facility, Tata Institute of Fundemental Research
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B. Lakshmi Madhavan
National Atmospheric Research Laboratory
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Gwenael Berthet
French National Centre for Scientific Research (CNRS)
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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 0.012 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.
27 Jul 2020Published in Journal of Geophysical Research: Atmospheres volume 125 issue 14. 10.1029/2020JD032410