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Methane and nitrous oxide in surface water along the North-West Passage, Arctic Ocean

Artikel i vetenskaplig tidskrift
Författare V. Kitidis
Robert C. Upstill-Goddard
Leif G Anderson
Publicerad i Marine Chemistry
Volym 121
Nummer/häfte 1-4
Sidor 80-86
ISSN 0304-4203
Publiceringsår 2010
Publicerad vid Institutionen för kemi
Sidor 80-86
Språk en
Länkar dx.doi.org/10.1016/j.marchem.2010.0...
Ämnesord Arctic zone; Polar waters; Methane; Nitrous oxide; Greenhouse effect; Sea ice
Ämneskategorier Kemi

Sammanfattning

Dissolved methane and nitrous oxide in seawater were measured along a 6700 km transect of the North-West Passage between the North Atlantic Ocean and Beaufort Sea in the Arctic Ocean. Over- and under-saturation with respect to atmospheric equilibrium were observed for both gases. Methane and nitrous oxide were in the range of 58–528% and 82–181% saturation, respectively. Under-saturation was attributed to melt-water with low methane and nitrous oxide, while over-saturation was found under multi-year sea-ice. Elevated methane was also found in the vicinity of the marginal ice zones and the Mackenzie River plume. Our data support both water column and sedimentary sources of methane and nitrous oxide. We found first-order methane oxidation in surface seawater with a rate constant of 3.8 × 10−3 h−1. Based on these results and a conceptual model, we suggest that future sea-ice retreat may decrease the residence times of methane and nitrous oxide in the surface Arctic Ocean and thus enhance the sea–air flux of these climatically active gases.

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