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Hexachlorocyclohexanes (HCHs) in the Canadian archipelago. 2. Air-water gas exchange of alpha- and gamma-HCH
Environm Canada, Ctr Atmospher Res Expt, Egbert, ON L0L 1N0, Canada..
Univ Toronto, Toronto, ON M5S 3E5, Canada..
Norwegian Inst Air Res, Polar Environm Ctr, NO-9296 Tromso, Norway.;Swedish Univ Agr Sci, Dept Environm Assessment, SE-70507 Uppsala, Sweden..ORCID iD: 0000-0002-5972-1852
Environm Canada, Ctr Atmospher Res Expt, Egbert, ON L0L 1N0, Canada..ORCID iD: 0000-0001-7469-0532
Responsible organisation
2008 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 42, no 2, p. 465-470Article in journal (Refereed) Published
Abstract [en]

Air and water were sampled in the Canadian Archipelago during summer on the Tundra Northwest 1999 (TNW-99) expedition and air was sampled at Resolute Bay (1313), Nunavut, to determine the gas exchange of a-and gamma-hexachlorocyclohexanes (HCHs) and the enantiomers of alpha-HCH. Air concentrations of Sigma HCH during TNW-99 and at RB were similar, averaging 55 and. 53 pg m(-3), respectively. The net gas exchange direction was volatilization for alpha-HCH and near equilibrium or deposition for gamma-HCH, whereas actual fluxes depended on the fraction of open water. Enantiomer fractions, EF = (+)/[(+) + (-)] of alpha-HCH in air sampled from shipboard were significantly correlated to those in surface water for events with >90% open water, but were closer to racemic and not correlated to EFs in water for events with 0-50% open water. Levels of alpha-HCH in air at RB averaged 37 9 pg m(-3) from June to early July, and EFs were close to racemic (0.496 +/- 0.004). In mid-July the ice pack broke up around RB. From this point through August, air concentrations increased significantly to 53 +/- 5 pg m(-3), and the mean EF decreased significantly to 0.483 +/- 0.009. Air concentrations of gamma-HCH at RB did not differ significantly before (8.0 +/- 3.7 pg m(-3)) and after (6.6 +/- 0.76 pg m(-3)) ice breakup. Results show that a-HCH enantiomers are sensitive tracers for following the impact of ice cover loss on gas exchange in the Arctic.

Place, publisher, year, edition, pages
2008. Vol. 42, no 2, p. 465-470
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Natural Sciences
Research subject
SWEDARCTIC; SWEDARCTIC 1999, Tundra nordväst 1999
Identifiers
URN: urn:nbn:se:polar:diva-2327DOI: 10.1021/es071646vISI: 000252317700027PubMedID: 18284148OAI: oai:DiVA.org:polar-2327DiVA, id: diva2:858417
Available from: 2015-10-02 Created: 2015-10-02 Last updated: 2017-12-01

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Kylin, HenrikBidlemant, Terry F.
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