The Global Inventory of Methane Hydrate in Marine Sediments: A Theoretical Approach.

Wallmann, Klaus, Pinero, Elena, Burwicz, Ewa, Haeckel, Matthias, Hensen, Christian, Dale, Andrew W. and Ruepke, Lars (2012) The Global Inventory of Methane Hydrate in Marine Sediments: A Theoretical Approach. Energies, 5 (7). pp. 2449-2498. DOI 10.3390/en5072449.

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Abstract

The accumulation of methane hydrate in marine sediments is controlled by a number of physical and biogeochemical parameters including the thickness of the gas hydrate stability zone (GHSZ), the solubility of methane in pore fluids, the accumulation of particulate organic carbon at the seafloor, the kinetics of microbial organic matter degradation and methane generation in marine sediments, sediment compaction and the ascent of deep-seated pore fluids and methane gas into the GHSZ. Our present knowledge on these controlling factors is discussed and new estimates of global sediment and methane fluxes are provided applying a transport-reaction model at global scale. The modeling and the data evaluation yield improved and better constrained estimates of the global pore volume within the modern GHSZ ( ≥ 44 × 1015 m3), the Holocene POC accumulation rate at the seabed (~1.4 × 1014 g yr−1), the global rate of microbial methane production in the deep biosphere (4−25 × 1012 g C yr−1) and the inventory of methane hydrates in marine sediments ( ≥ 455 Gt of methane-bound carbon).

Document Type: Article
Keywords: methane; gas hydrate; marine sediments; global change
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R05
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-JRG-B3 Seabed Resources
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3390/en5072449
ISSN: 1996-1073
Date Deposited: 16 Oct 2012 09:42
Last Modified: 13 Mar 2017 10:18
URI: http://oceanrep.geomar.de/id/eprint/16463

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