Enhanced concentrations of dissolved gaseous mercury in the surface waters of the Arctic Ocean
Artikel i vetenskaplig tidskrift, 2008

During an almost three months long expedition in the Arctic Ocean, the Beringia 2005, dissolved gaseous mercury (DGM) was measured continuously in the surface water. The DGM concentration was measured using an equilibrium system, i.e. the DGM in the water phase equilibrated with a stream of gas and the gas was thereafter analysed with respect to its mercury content. The DGM concentrations were calculated using the following equation, DGM = Hg eq / k H' where Hg eq is the equilibrated concentration of elemental mercury in the gas phase and k H' is the dimensionless Henry's law constant at desired temperature and salinity. During the expedition several features were observed. For example, enhanced DGM concentration was measured underneath the ice which may indicate that the sea ice acted as a barrier for evasion of mercury from the Arctic Ocean to the atmosphere. Furthermore, elevated DGM concentrations were observed in water that might have originated from river discharge. The gas-exchange of mercury between the ocean and the atmosphere was calculated in the open water and both deposition and evasion were observed. The measurements showed significantly enhanced DGM concentrations, compared to more southern latitudes. © 2008 Elsevier B.V. All rights reserved.

gas-exchange

mediterranean sea

humic substances

time-series

elemental mercury

coastal seawater

atmospheric mercury

atlantic-ocean

air

springtime depletion

Författare

Maria Andersson

Göteborgs universitet

J. Sommar

Göteborgs universitet

Katarina Gårdfeldt

Göteborgs universitet

Oliver Lindqvist

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Marine Chemistry

0304-4203 (ISSN)

Vol. 110 190-194

Ämneskategorier

Oceanografi, hydrologi, vattenresurser

Kemi

DOI

10.1016/j.marchem.2008.04.002