Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation
This study provides new estimates for the global offshore methane hydrate inventory formed due to microbial CH4 production under Quaternary and Holocene boundary conditions. A multi-1D model for particular organic carbon (POC) degradation, gas hydrate formation and dissolution is presented. The nove...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://oceanrep.geomar.de/id/eprint/13115/ https://oceanrep.geomar.de/id/eprint/13115/1/2011_Burwicz_Ruepke_Wallmann_GCA.pdf https://doi.org/10.1016/j.gca.2011.05.029 |
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ftoceanrep:oai:oceanrep.geomar.de:13115 2023-05-15T15:16:35+02:00 Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation Burwicz, Ewa B. Rüpke, Lars Wallmann, Klaus 2011 text https://oceanrep.geomar.de/id/eprint/13115/ https://oceanrep.geomar.de/id/eprint/13115/1/2011_Burwicz_Ruepke_Wallmann_GCA.pdf https://doi.org/10.1016/j.gca.2011.05.029 en eng Elsevier https://oceanrep.geomar.de/id/eprint/13115/1/2011_Burwicz_Ruepke_Wallmann_GCA.pdf Burwicz, E. B. , Rüpke, L. and Wallmann, K. (2011) Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation. Geochimica et Cosmochimica Acta, 75 (16). pp. 4562-4576. DOI 10.1016/j.gca.2011.05.029 <https://doi.org/10.1016/j.gca.2011.05.029>. doi:10.1016/j.gca.2011.05.029 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2011 ftoceanrep https://doi.org/10.1016/j.gca.2011.05.029 2023-04-07T15:01:58Z This study provides new estimates for the global offshore methane hydrate inventory formed due to microbial CH4 production under Quaternary and Holocene boundary conditions. A multi-1D model for particular organic carbon (POC) degradation, gas hydrate formation and dissolution is presented. The novel reaction-transport model contains an open three-phase system of two solid compounds (organic carbon, gas hydrates), three dissolved species (methane, sulfates, inorganic carbon) and one gaseous phase (free methane). The model computes time-resolved concentration profiles for all compounds by accounting for chemical reactions as well as diffusive and advective transport processes. The reaction module builds upon a new kinetic model of POC degradation which considers a down-core decrease in reactivity of organic matter. Various chemical reactions such as organic carbon decay, anaerobic oxidation of methane, methanogenesis, and sulfate reduction are resolved using appropriate kinetic rate laws and constants. Gas hydrates and free gas form if the concentration of dissolved methane exceeds the pressure, temperature, and salinity-dependent solubility limits of hydrates and/or free gas, with a rate given by kinetic parameters. Global input grids have been compiled from a variety of oceanographic, geological and geophysical data sets including a new parameterization of sedimentation rates in terms of water depth. We find prominent gas hydrate provinces offshore Central America where sediments are rich in organic carbon and in the Arctic Ocean where low bottom water temperatures stabilize methane hydrates. The world’s total gas hydrate inventory is estimated at 0.82 x 10sup13 m3 - 2.10 x 10sup15 m3 CH4 (at STP conditions) or, equivalently, 4.18–995 Gt of methane carbon. The first value refers to present day conditions estimated using the relatively low Holocene sedimentation rates; the second value corresponds to a scenario of higher Quaternary sedimentation rates along continental margins. Our results clearly show that ... Article in Journal/Newspaper Arctic Arctic Ocean Methane hydrate OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Geochimica et Cosmochimica Acta 75 16 4562 4576 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
This study provides new estimates for the global offshore methane hydrate inventory formed due to microbial CH4 production under Quaternary and Holocene boundary conditions. A multi-1D model for particular organic carbon (POC) degradation, gas hydrate formation and dissolution is presented. The novel reaction-transport model contains an open three-phase system of two solid compounds (organic carbon, gas hydrates), three dissolved species (methane, sulfates, inorganic carbon) and one gaseous phase (free methane). The model computes time-resolved concentration profiles for all compounds by accounting for chemical reactions as well as diffusive and advective transport processes. The reaction module builds upon a new kinetic model of POC degradation which considers a down-core decrease in reactivity of organic matter. Various chemical reactions such as organic carbon decay, anaerobic oxidation of methane, methanogenesis, and sulfate reduction are resolved using appropriate kinetic rate laws and constants. Gas hydrates and free gas form if the concentration of dissolved methane exceeds the pressure, temperature, and salinity-dependent solubility limits of hydrates and/or free gas, with a rate given by kinetic parameters. Global input grids have been compiled from a variety of oceanographic, geological and geophysical data sets including a new parameterization of sedimentation rates in terms of water depth. We find prominent gas hydrate provinces offshore Central America where sediments are rich in organic carbon and in the Arctic Ocean where low bottom water temperatures stabilize methane hydrates. The world’s total gas hydrate inventory is estimated at 0.82 x 10sup13 m3 - 2.10 x 10sup15 m3 CH4 (at STP conditions) or, equivalently, 4.18–995 Gt of methane carbon. The first value refers to present day conditions estimated using the relatively low Holocene sedimentation rates; the second value corresponds to a scenario of higher Quaternary sedimentation rates along continental margins. Our results clearly show that ... |
format |
Article in Journal/Newspaper |
author |
Burwicz, Ewa B. Rüpke, Lars Wallmann, Klaus |
spellingShingle |
Burwicz, Ewa B. Rüpke, Lars Wallmann, Klaus Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation |
author_facet |
Burwicz, Ewa B. Rüpke, Lars Wallmann, Klaus |
author_sort |
Burwicz, Ewa B. |
title |
Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation |
title_short |
Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation |
title_full |
Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation |
title_fullStr |
Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation |
title_full_unstemmed |
Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation |
title_sort |
estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of holocene sedimentation |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/13115/ https://oceanrep.geomar.de/id/eprint/13115/1/2011_Burwicz_Ruepke_Wallmann_GCA.pdf https://doi.org/10.1016/j.gca.2011.05.029 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Methane hydrate |
genre_facet |
Arctic Arctic Ocean Methane hydrate |
op_relation |
https://oceanrep.geomar.de/id/eprint/13115/1/2011_Burwicz_Ruepke_Wallmann_GCA.pdf Burwicz, E. B. , Rüpke, L. and Wallmann, K. (2011) Estimation of the global amount of submarine gas hydrates formed via microbial methane formation based on numerical reaction-transport modeling and a novel parameterization of Holocene sedimentation. Geochimica et Cosmochimica Acta, 75 (16). pp. 4562-4576. DOI 10.1016/j.gca.2011.05.029 <https://doi.org/10.1016/j.gca.2011.05.029>. doi:10.1016/j.gca.2011.05.029 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gca.2011.05.029 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
75 |
container_issue |
16 |
container_start_page |
4562 |
op_container_end_page |
4576 |
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1766346866941755392 |