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The relationship between biophysical variables and halocarbon distributions in the waters of the Amundsen and Ross Seas, Antarctica
Responsible organisation
2012 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 140Article in journal (Refereed) Published
Abstract [en]

Little is known regarding the distribution of volatile halogenated organic compounds (halocarbons) in Antarctic waters and their relation to biophysical variables. During the austral summer (December to January) in 2007-08 halocarbon and pigment concentrations were measured in the Amundsen (100-130 degrees W) and Ross Sea (158 degrees W-160 degrees E). In addition, halocarbons were determined in air, snow and sea ice. The distribution of halocarbons was influenced to a large extent by sea ice, and to a much lesser extent by pelagic biota. Concentrations of naturally produced halocarbons were elevated in the surface mixed layer in ice covered areas compared to open waters in polynyas and in the bottom waters of the Ross Sea. Higher concentrations of halocarbons were also found in sea ice brine compared to the surface waters. Incubations of snow revealed an additional source of halocarbons. The distribution of halocarbons also varied considerably between the Amundsen and Ross Seas, mainly due to the different oceanographic settings. For iodinated compounds, weak correlations were found with the presence of pigments indicative of Phaeocystis, mainly in the Ross Sea. Surface waters of the Amundsen and Ross Seas are a sink for bromoform (saturation anomalies, SA, -83 to 11%), whereas sea ice was found to be both a source and sink (SA -61-97%). In contrast, both surface waters and sea ice were found to be a source of chloroiodomethane (SA -6-1 200% and 91-22 000 resp.). Consequently, polar waters can have a substantial impact on global halocarbon budgets and need to be included in large-scale assessments. (C) 2012 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 140
Keyword [en]
Antarctic Sea ice Brine Biogenic halocarbons Pigments Amundsen Sea Ross Sea halogenated organic-compounds southern-ocean phytoplankton growth climate-change ice algae bromoform seawater constants profiles methanes Chemistry Oceanography
National Category
Natural Sciences
Research subject
SWEDARP 2007/08, Oden Southern Ocean 2007/08
Identifiers
URN: urn:nbn:se:polar:diva-1918DOI: 10.1016/j.marchem.2012.07.002OAI: oai:DiVA.org:polar-1918DiVA: diva2:810343
Note

ISI Document Delivery No.: 017VC Times Cited: 9 Cited Reference Count: 51 Mattson, Erik Karlsson, Anders Smith, Walker O., Jr. Abrahamsson, Katarina Abrahamsson, Katarina/A-7616-2010 NSF [ANT-0741380, ANT-0836112]; Swedish Research Council; Knut och Alice Wallenbergs Foundation; Swedish Polar Research Secretariat We thank the officers and crew of the R.V.I.B. Oden for their help during the cruise, as well as our OSO 2007 colleagues. We especially thank Daniel Barrdahl for assistance during the expedition. This research was supported by NSF grants ANT-0741380 and ANT-0836112 to WOS, the Swedish Research Council, Knut och Alice Wallenbergs Foundation, and the Swedish Polar Research Secretariat. Section plots were made in Ocean Data View (Schlitzer, 2011). 9 Elsevier science bv Amsterdam Chemistry, Multidisciplinary; Oceanography

Available from: 2015-05-07 Created: 2015-05-06 Last updated: 2016-11-21

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