The role of glassy aerosol in cirrus ice cloud formation

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• Theodore Wilson, University of Leeds
• Monday 14 November 2011, 14:15-15:00
• Unilever Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Dr Alex Archibald.

An increasing body of evidence suggests that some atmospheric aerosol exist in a glassy or other amorphous solid state. The physical state of aerosol affects the way in which they nucleate ice. This can change cirrus cloud ice particle size and number, which in turn impacts the clouds radiative properties. In this talk, experiments performed at the AIDA cloud simulation chamber are presented which show that glassy aerosols catalyse ice formation by nucleating ice heterogeneously in the deposition mode at temperatures up to ~220 K. Using a one dimensional model, we show that ice nucleation by glassy aerosol affects cirrus cloud ice particle size and number.

This talk is part of the Centre for Atmospheric Science seminars, Chemistry Dept. series.

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