Vendredi 10 novembre 2017 à 11h

Salle de réunion 411, tour 45-46, 4ème étage

On the role of stratospheric ozone feedbacks in the climate system

Gabriel Chiodo

Dep. of Applied Physics and Applied Mathematics
Columbia University, New York

Ozone chemistry and its feedbacks in the climate system are commonly neglected in state-of-the-art climate models involved in future climate projections; the impact of this simplification is still unclear. By carrying out model simulations from the Community Earth System Model (CESM), I quantify the effect of coupling the stratospheric ozone chemistry onto the model's sensitivity to solar and anthropogenic greenhouse gases (GHG). I will show that interactive stratospheric ozone reduces the model response to GHG and solar forcing, albeit through two different mechanisms. Accordingly, stratospheric ozone responses yield an important and yet undocumented negative feedback in the climate system.