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Air-sea exchange of volatile mercury in the North Atlantic Ocean
Responsible organisation
2011 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 125, no 1-4, 1-7 p.Article in journal (Refereed) Published
Abstract [en]

Part of the Beringia 2005 expedition covered the North Atlantic Ocean. During this passage, dissolved gaseous mercury (DGHg) in seawater and atmospheric concentrations of total gaseous mercury (TGHg), carbon monoxide (CO), and ozone (O-3) were measured continuously at high resolution. In addition, meteorological parameters such as wind speed and water temperature were measured continuously by the ship’s meteorological instrumentation. The DGHg concentration was measured using a continuous equilibrium system where the elemental mercury in the sea water was equilibrated with a stream of gas. The DGHg concentration was calculated using DGHg=Hg-eq/k(H), where Hg-eq is the concentration of elemental mercury in the equilibrated air and k(H), is the dimensionless Henry’s law constant. The degree of saturation was determined directly from the measurements S = Hg-eq/TGHg. The water sampled had an average DGHg concentration of 58 +/- 10 fM and the average TGHg concentration was determined to 1.7 +/- 0.1 ng m(-3). The water sampled was under- and super-saturated with respect to elemental mercury covering a large range of saturation of 70 to 230% resulting in an average degree of saturation of 150 +/- 30%. Therefore, both evasion and deposition of elemental mercury were observed in the sampled water. In the light of the average flux, 2.1 +/- 1.8 pmol m(-2) h(-1), it is concluded that mostly evasion occured during the sampling period. (C) 2011 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2011. Vol. 125, no 1-4, 1-7 p.
Keyword [en]
Mercury; In situ measurements; Gas exchange; Flux; North Atlantic Ocean; DGHg; TGHg; Water measurements; Air measurements
National Category
Natural Sciences
Research subject
SWEDARCTIC 2005, Beringia 2005
Identifiers
URN: urn:nbn:se:polar:diva-3051DOI: 10.1016/j.marchem.2011.01.005OAI: oai:DiVA.org:polar-3051DiVA: diva2:1044960
Available from: 2016-11-07 Created: 2016-10-27 Last updated: 2016-11-07

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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