Organic bromine compounds produced in sea ice in Antarctic winter

Abrahamsson, Katarina; Granfors, Anna; Ahnoff, Martin; Cuevas, Carlos A.; Saiz-Lopez, Alfonso

doi:10.1038/s41467-018-07062-8

Title: Organic bromine compounds produced in sea ice in Antarctic winter

Journal Article · 11 December 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-07062-8 · OSTI ID:1624121

Abrahamsson, Katarina ^[1]; Granfors, Anna ^[2]; Ahnoff, Martin ^[1]; Cuevas, Carlos A. ^[3];

^[3]

Univ. of Gothenburg (Sweden)
AstraZeneca, Molndal (Sweden)
Institute of Physical Chemistry Rocasolano, Madrid (Spain)

During polar springtime, active bromine drives ozone, a greenhouse gas, to near-zero levels. Bromine production and emission in the polar regions have so far been assumed to require sunlight. Here, we report measurements of bromocarbons in sea ice, snow, and air during the Antarctic winter that reveal an unexpected new source of organic bromine to the atmosphere during periods of no sunlight. The results show that Antarctic winter sea ice provides 10 times more bromocarbons to the atmosphere than Southern Ocean waters, and substantially more than summer sea ice. The inclusion of these measurements in a global climate model indicates that the emitted bromocarbons will disperse throughout the troposphere in the southern hemisphere and through photochemical degradation to bromine atoms, contribute ~10% to the tropospheric reactive bromine budget. Combined together, our results suggest that winter sea ice could potentially be an important source of atmospheric bromine with implications for atmospheric chemistry and climate at a hemispheric scale.

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Research Organization:: National Center for Atmospheric Research (NCAR), Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); Swedish Research Council (SRC); Consejo Superior de Investigaciones Científicas (CSIC) of Spain; National Science Foundation (NSF)

OSTI ID:: 1624121

Journal Information:: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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