Joint Seminar: Validating global model predictions of aerosol-cloud interactions using a large volcanic fissure eruption

Mankind influences climate through emissions of both greenhouse gases and aerosols/aerosol precursors. Aerosol-climate impacts are highly uncertain owing primarily to their poorly quantified influence on cloud properties. Satellite observations show that during 2014-2015, a volcanic fissure eruption in Iceland emitted huge quantities of sulphur dioxide resulting in relatively pristine clouds being replaced by polluted clouds of higher reflectivity. We compare results from different state-of-the-art climate models and show that only one represents both the observed perturbation to cloud droplet effective radius and the negligible perturbation to cloud liquid water path. We estimate a global mean effective radiative forcing of around -0.2Wm-2 for the time period of investigation and conclude that aerosol-cloud interactions beyond the impact on cloud effective radius are small.

Date

04.05.2016

Time

13:30 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Jim Haywood, Met Office, United Kingdom

Organizers

Bjorn Stevens

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