Physics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2459k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 22, p. 2459-2462
Physics
8
Annual Variations, Atmospheric Composition, Beaufort Sea (North America), Continental Shelves, Methane, Coastal Water, Concentration (Composition), Latitude, Marine Environments, Sea Ice
Scientific paper
Methane concentrations in the Beaufort Sea under the winter ice canopy offshore from northern Alaska are 3 to 28 times greater than they are in late summer when the ice is absent in a similar region offshore from northern Canada where methane is in approximate equilibrium with the atmosphere. These observations suggest that methane concentrates in the water under the sea-ice cover during winter and ventilates rapidly in late summer as the ice melts and retreats. Conditions similar to those on the Beaufort Sea shelf likely exist on the much larger Siberian shelf, making the Arctic Ocean margin a possible seasonal, high-latitude, marine source of about 0.1 Tg/yr atmospheric methane. The small addition of methane likely contributes to the late-summer increase in atmospheric methane that is observed each year particularly in the northern hemisphere.
Barnes Peter W.
Kvenvolden Keith A.
Lilley Deloris M.
Lorenson Thomas D.
McLaughlin Elizabeth
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