Event Details

DSNE seminar with Matt Rigby, University of Bristol

Since the global ratification of the Montreal Protocol, atmospheric observations show that the major ozone depleting substances are declining in concentration in the atmosphere. As well as limiting the loss of stratospheric ozone, these reductions have a substantial impact on radiative forcing, because ozone depleting substances are also potent greenhouse gases. The 2016 Kigali Amendment to the Montreal Protocol is expected to lead to further climate benefits, by limiting production and use of the non-ozone depleting hydrofluorocarbons. Despite the clear achievements of the Montreal Protocol over the last three decades, observations have shown some puzzling discrepancies with projections in the last few years. In particular, emissions of substances such as CFC-11 have not declined as expected. I will show how regional atmospheric data has been used to determine where these emissions originate, and how they have changed following their identification.

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