Methane in the northern Atlantic controlled by microbial oxidation and atmospheric history

Rehder, Gregor, Keir, Robin, Suess, Erwin and Rhein, Monika (1999) Methane in the northern Atlantic controlled by microbial oxidation and atmospheric history Geophysical Research Letters, 26 (5). pp. 587-590. DOI 10.1029/1999GL900049.

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During May - August, 1997, the distributions of dissolved methane and CCl3F (CFC11) were measured in the Atlantic between 50° and 60°N. In surface waters throughout the region, methane was observed to be close to equilibrium with the atmospheric mixing ratio, implying that surface ocean methane is tracking its atmospheric history in regions of North Atlantic Deep Water formation. Despite the different atmospheric history and ocean chemistry of CH4 and CFC11, their spatial distribution patterns in the water column are remarkably similar. One-dimensional distributions have been simulated with an advection-diffusion model forced by the atmospheric histories. The results suggest that the similar patterns result from the increasing input of CH4 and CFC11 to newly formed deep waters over time, combined with the effect of horizontal mixing and the oxidation of methane on a 50 year time scale.

Document Type: Article
Keywords: Methane, northern Atlantic, microbial oxidation, atmospheric history
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
DOI etc.: 10.1029/1999GL900049
ISSN: 0094-8276
Projects: SFB460, OMEX
Date Deposited: 18 Feb 2008 17:24
Last Modified: 13 Feb 2018 13:53

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