Geochemistry of clathrate-derived methane in Arctic ocean waters
Article first published online: 26 JUN 2010
Copyright 2010 by the American Geophysical Union.
Geophysical Research Letters
Volume 37, Issue 12, June 2010
How to Cite
2010), Geochemistry of clathrate-derived methane in Arctic ocean waters, Geophys. Res. Lett., 37, L12607, doi:10.1029/2010GL043369., , , and (
- Issue published online: 26 JUN 2010
- Article first published online: 26 JUN 2010
- Manuscript Accepted: 13 MAY 2010
- Manuscript Revised: 7 MAY 2010
- Manuscript Received: 27 MAR 2010
 Alterations to the composition of seawater are estimated for microbial oxidation of methane from large polar clathrate destabilizations, which may arise in the coming century. Gas fluxes are taken from porous flow models of warming Arctic sediment. Plume spread parameters are then used to bracket the volume of dilution. Consumption stoichiometries for the marine methanotrophs are based on growth efficiency and elemental/enzyme composition data. The nutritional demand implied by extra CH4 removal is compared with supply in various high latitude water masses. For emissions sized to fit the shelf break, reaction potential begins at one hundred micromolar and falls to order ten a thousand kilometers downstream. Oxygen loss and carbon dioxide production are sufficient respectively to hypoxify and acidify poorly ventilated basins. Nitrogen and the monooxygenase transition metals may be depleted in some locations as well. Deprivation is implied relative to existing ecosystems, along with dispersal of the excess dissolved gas. Physical uncertainties are inherent in the clathrate abundance, patch size, outflow buoyancy and mixing rate. Microbial ecology is even less defined but may involve nutrient recycling and anaerobic oxidizers.