Stratospheric ozone changes from explosive tropical volcanoes: Modelling and ice core constraints

Alison Ming , V. Holly L. Winton , James Keeble , Nathan L Abraham , Mohit C Dalvi , Paul Griffiths , Nicolas Caillon , Anna E Jones , Robert Mulvaney , Joël Savarino (1) , Markus M Frey , Xin Yang

1 IGE - Institut des Géosciences de l’Environnement

• The tropical volcanic eruption in the model shows that the sign of the ozone change is highly sensitive to stratospheric chlorine amounts. • δ 15 N(NO − 3) (a proxy for surface ultraviolet radiation) from the Samalas eruption is obscured by inter-annual variability in the ice core. • δ 15 N(NO − 3) changes are unlikely to be synchronous with volcanic sulphate peaks due to different pathways for these signals to reach the ice.

Domaines: Climatologie; Océan, Atmosphère; Glaciologie

Alison Ming, V. Holly L. Winton, James Keeble, Nathan L Abraham, Mohit C Dalvi, et al.. Stratospheric ozone changes from explosive tropical volcanoes: Modelling and ice core constraints. Journal of Geophysical Research: Atmospheres, 2020, 125 (11), ⟨10.1029/2019jd032290⟩. ⟨hal-03402301⟩