Iodine compounds in polar regions and their relevance to regional aerosol & climate.

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• Dr Howard K Roscoe, British Antarctic Survey
• Monday 25 April 2016, 14:15-15:15
• Unilever Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Paul Griffiths.

Measurements of iodine compounds in the sea ice zone of the Weddell Sea in Antarctica, in 2009, showed that most are emitted as I2 rather than other inorganic iodine compounds or iodocarbons. Formation of new particles was also observed in the sea ice zone, consistent with earlier measurements in the sea ice zone and with model predictions of particle formation from iodine compounds. Measurements in Arctic first-year sea ice in 2010 showed similar amounts of some iodine compounds to those of Antarctica. Particles, iodine monoxide, and sulphur compounds in aerosol, were measured for several years at two Weddell Sea coastal sites; the results showed strong correlation between IO and particles in 10-day averaged data, but not in hourly data. This suggests that most new-particle formation occurred well offshore and so the particles were viable, which has implications for regional climate via the aerosol indirect effect.

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

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