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Organic iodine in Antarctic sea ice: a comparison between winter in the Weddell Sea and summer in the Amundsen Sea

Journal article
Authors Anna Granfors
Martin Ahnoff
Matthew M. Mills
Katarina Abrahamsson
Published in Journal of Geophysical Research - Biogeosciences
Volume 119
Issue 12
Pages 2276-2291
ISSN 0148-0227
Publication year 2014
Published at Department of Chemistry and Molecular Biology
Pages 2276-2291
Language en
Links http://dx.doi.org/10.1002/2014JG00...
Keywords Iodintaed halocarbons, Antarctica, winter, summer, ozone degradation, sea ice
Subject categories Earth and Related Environmental Sciences, Chemical Sciences

Abstract

Recent studies have recognized sea ice as a source of reactive iodine to the Antarctic boundary layer. Volatile iodinated compounds (iodocarbons) are released from sea ice, and they have been suggested to contribute to the formation of iodine oxide (IO), which takes part in tropospheric ozone destruction in the polar spring. We measured iodocarbons (CH3I, CH2ClI, CH2BrI and CH2I2) in sea ice, snow, brine and air during two expeditions to Antarctica, OSO 10/11 to the Amundsen Sea during austral summer, and ANT XXIX/6 to the Weddell Sea in austral winter. These are the first reported measurements of iodocarbons from the Antarctic winter. Iodocarbons were enriched in sea ice in relation to seawater in both summer and winter. During summer the positive relationship to Chl a biomass indicated a biological origin. We suggest that CH3I is formed biotically in sea ice during both summer and winter. For CH2ClI, CH2BrI and CH2I2 an additional abiotic source at the snow-ice interface in winter is suggested . Elevated air concentrations of CH3I and CH2ClI during winter indicate that they are enriched in lower troposphere and may take part in formation of IO at polar sunrise.

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