Now showing items 1-6 of 6
Strong atmospheric chemistry feedback to climate warming from Arctic methane emissions
(American Geophysical Union, 2011-04-20)
The magnitude and feedbacks of future methane release from the Arctic region are unknown. Despite limited documentation of potential future releases associated with thawing permafrost and degassing methane hydrates, the ...
Shallow stratigraphic control on pockmark distribution in north temperate estuaries
(Elsevier B.V., 2012-09-27)
Pockmark fields occur throughout northern North American temperate estuaries despite the absence of extensive thermogenic hydrocarbon deposits typically associated with pockmarks. In such settings, the origins of the gas ...
Mass fractionation of noble gases in synthetic methane hydrate : implications for naturally occurring gas hydrate dissociation
(Elsevier B.V., 2012-09-29)
As a consequence of contemporary or longer term (since 15 ka) climate warming, gas hydrates in some settings may presently be dissociating and releasing methane and other gases to the ocean–atmosphere system. A key challenge ...
Automated feature extraction and spatial organization of seafloor pockmarks, Belfast Bay, Maine, USA
(Elsevier B.V., 2010-08-20)
Seafloor pockmarks occur worldwide and may represent millions of m3 of continental shelf erosion, but few numerical analyses of their morphology and spatial distribution of pockmarks exist. We introduce a quantitative ...
Assessing sulfate reduction and methane cycling in a high salinity pore water system in the northern Gulf of Mexico
(Elsevier B.V., 2008-05-10)
Pore waters extracted from 18 piston cores obtained on and near a salt-cored bathymetric high in Keathley Canyon lease block 151 in the northern Gulf of Mexico contain elevated concentrations of chloride (up to 838 mM) and ...
Methane sources in gas hydrate-bearing cold-seeps : evidence from radiocarbon and stable isotopes
Fossil methane from the large and dynamic marine gas hydrate reservoir has the potential to influence oceanic and atmospheric carbon pools. However, natural radiocarbon (14C) measurements of gas hydrate methane have been ...