Biogenic halocarbons in young Arctic sea ice and frost flowers
The fate of halocarbons, naturally produced volatile halogenated organic compounds, in young Arctic sea icewas studied to better understand the role of sea ice in halocarbon cycling. In early spring, halocarbons weremeasured in sea ice frozen in core holes, during 12 days of formation and freezing....
| Published in: | Marine Chemistry |
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| Main Authors: | , , , , , , , |
| Language: | unknown |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.marchem.2013.06.002 https://research.chalmers.se/en/publication/183272 |
| Summary: | The fate of halocarbons, naturally produced volatile halogenated organic compounds, in young Arctic sea icewas studied to better understand the role of sea ice in halocarbon cycling. In early spring, halocarbons weremeasured in sea ice frozen in core holes, during 12 days of formation and freezing. In order to understandwhich factors govern halocarbon concentration and distribution, salinity, temperature and biological parameterswere monitored in the growing sea ice. It was found that sea ice participates in the cycling of halocarbonsbetween sea and air. Sea ice concentrations and distributions of these compounds were influenced byproduction in the ice, where ice-inhabiting microorganisms caused local increases in halocarbon concentrations.Moreover, the halocarbon ice concentration decrease/change with time did not follow ice salinity,suggesting that additional removal processes caused sea ice to be a source of halogens to overlying air. Thenet production rate of bromoform in the surface of newly frozen ice was estimated to 14 pmol L−1 d−1and the maximum removal rate was 18 pmol L−1 d−1. In addition frost flowers on newly formed sea icewere identified as contributors of halocarbons to the atmosphere with halocarbon concentrations in thesame order of magnitude as in sea ice brine |
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