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Seminar

Title : Evidence for continued ozone layer reduction
Name of the speaker : William Ball
Affiliation : ETH Zürich and PMOD, Davos
Laboratory organizer : LATMOS
Date and time : 28-11-2017 11h00
Location : Campus de Jussieu, Salle de réunion 411, tour 45-46, 4ème étage
Summary :

Stratospheric ozone protects life from harmful ultraviolet radiation. The Montreal Protocol, enacted to prevent ozone depletion from human activity, halted declines in column-integrated ozone in the 1990s; the upper stratosphere is recovering, but lower stratospheric trends are unknown. I will present clear evidence that lower stratospheric ozone continues to decline, preventing total ozone recovery. This result contradicts expectations and, with no clear understanding of why this trend has emerged, implies that the problem of ozone depletion is not yet fully solved. The decline may impact future estimates of ozone layer recovery, the stratospheric response to climate change, radiative climate forcing, ozone exchange between the stratosphere and troposphere, and surface levels of ultraviolet radiation.

Contact :

franck.lefevre@latmos.ipsl.fr