Marine methane cycle simulations for the period of early global warming
Geochemical environments, fates, and effects are modeled for methane released into seawater by the decomposition of climate-sensitive clathrates. A contemporary global background cycle is first constructed, within the framework of the Parallel Ocean Program. Input from organics in the upper thermocl...
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Lawrence Berkeley National Laboratory
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Online Access: | https://doi.org/10.1029/2010JG001300 https://digital.library.unt.edu/ark:/67531/metadc835919/ |
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ftunivnotexas:info:ark/67531/metadc835919 2023-05-15T14:29:18+02:00 Marine methane cycle simulations for the period of early global warming Elliott, S. Maltrud, M. Reagan, M.T. Moridis, G.J. Cameron-Smith, P.J. Lawrence Berkeley National Laboratory. Earth Sciences Division. 2011-01-02 Text https://doi.org/10.1029/2010JG001300 https://digital.library.unt.edu/ark:/67531/metadc835919/ English eng Lawrence Berkeley National Laboratory rep-no: LBNL-4239E grantno: DE-AC02-05CH11231 doi:10.1029/2010JG001300 osti: 1004697 https://digital.library.unt.edu/ark:/67531/metadc835919/ ark: ark:/67531/metadc835919 Journal Name: Journal of Geophysical Research--Biogeosciences; Journal Volume: 116; Journal Issue: G1 Removal Surface Waters Abundance 58 Continental Shelf Oxygen 54 Nutrients Fluid Flow Clathrates Kinetics Sensitivity Methane Point Sources Saturation Seawater Buildup Greenhouse Effect Plumes Instability Acidification Article 2011 ftunivnotexas https://doi.org/10.1029/2010JG001300 2017-09-30T22:07:52Z Geochemical environments, fates, and effects are modeled for methane released into seawater by the decomposition of climate-sensitive clathrates. A contemporary global background cycle is first constructed, within the framework of the Parallel Ocean Program. Input from organics in the upper thermocline is related to oxygen levels, and microbial consumption is parameterized from available rate measurements. Seepage into bottom layers is then superimposed, representing typical seabed fluid flow. The resulting CH{sub 4} distribution is validated against surface saturation ratios, vertical sections, and slope plume studies. Injections of clathrate-derived methane are explored by distributing a small number of point sources around the Arctic continental shelf, where stocks are extensive and susceptible to instability during the first few decades of global warming. Isolated bottom cells are assigned dissolved gas fluxes from porous-media simulation. Given the present bulk removal pattern, methane does not penetrate far from emission sites. Accumulated effects, however, spread to the regional scale following the modeled current system. Both hypoxification and acidification are documented. Sensitivity studies illustrate a potential for material restrictions to broaden the perturbations, since methanotrophic consumers require nutrients and trace metals. When such factors are considered, methane buildup within the Arctic basin is enhanced. However, freshened polar surface waters act as a barrier to atmospheric transfer, diverting products into the deep return flow. Uncertainties in the logic and calculations are enumerated including those inherent in high-latitude clathrate abundance, buoyant effluent rise through the column, representation of the general circulation, and bacterial growth kinetics. Article in Journal/Newspaper Arctic Basin Arctic Global warming University of North Texas: UNT Digital Library Arctic Journal of Geophysical Research 116 G1 |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Removal Surface Waters Abundance 58 Continental Shelf Oxygen 54 Nutrients Fluid Flow Clathrates Kinetics Sensitivity Methane Point Sources Saturation Seawater Buildup Greenhouse Effect Plumes Instability Acidification |
spellingShingle |
Removal Surface Waters Abundance 58 Continental Shelf Oxygen 54 Nutrients Fluid Flow Clathrates Kinetics Sensitivity Methane Point Sources Saturation Seawater Buildup Greenhouse Effect Plumes Instability Acidification Elliott, S. Maltrud, M. Reagan, M.T. Moridis, G.J. Cameron-Smith, P.J. Marine methane cycle simulations for the period of early global warming |
topic_facet |
Removal Surface Waters Abundance 58 Continental Shelf Oxygen 54 Nutrients Fluid Flow Clathrates Kinetics Sensitivity Methane Point Sources Saturation Seawater Buildup Greenhouse Effect Plumes Instability Acidification |
description |
Geochemical environments, fates, and effects are modeled for methane released into seawater by the decomposition of climate-sensitive clathrates. A contemporary global background cycle is first constructed, within the framework of the Parallel Ocean Program. Input from organics in the upper thermocline is related to oxygen levels, and microbial consumption is parameterized from available rate measurements. Seepage into bottom layers is then superimposed, representing typical seabed fluid flow. The resulting CH{sub 4} distribution is validated against surface saturation ratios, vertical sections, and slope plume studies. Injections of clathrate-derived methane are explored by distributing a small number of point sources around the Arctic continental shelf, where stocks are extensive and susceptible to instability during the first few decades of global warming. Isolated bottom cells are assigned dissolved gas fluxes from porous-media simulation. Given the present bulk removal pattern, methane does not penetrate far from emission sites. Accumulated effects, however, spread to the regional scale following the modeled current system. Both hypoxification and acidification are documented. Sensitivity studies illustrate a potential for material restrictions to broaden the perturbations, since methanotrophic consumers require nutrients and trace metals. When such factors are considered, methane buildup within the Arctic basin is enhanced. However, freshened polar surface waters act as a barrier to atmospheric transfer, diverting products into the deep return flow. Uncertainties in the logic and calculations are enumerated including those inherent in high-latitude clathrate abundance, buoyant effluent rise through the column, representation of the general circulation, and bacterial growth kinetics. |
author2 |
Lawrence Berkeley National Laboratory. Earth Sciences Division. |
format |
Article in Journal/Newspaper |
author |
Elliott, S. Maltrud, M. Reagan, M.T. Moridis, G.J. Cameron-Smith, P.J. |
author_facet |
Elliott, S. Maltrud, M. Reagan, M.T. Moridis, G.J. Cameron-Smith, P.J. |
author_sort |
Elliott, S. |
title |
Marine methane cycle simulations for the period of early global warming |
title_short |
Marine methane cycle simulations for the period of early global warming |
title_full |
Marine methane cycle simulations for the period of early global warming |
title_fullStr |
Marine methane cycle simulations for the period of early global warming |
title_full_unstemmed |
Marine methane cycle simulations for the period of early global warming |
title_sort |
marine methane cycle simulations for the period of early global warming |
publisher |
Lawrence Berkeley National Laboratory |
publishDate |
2011 |
url |
https://doi.org/10.1029/2010JG001300 https://digital.library.unt.edu/ark:/67531/metadc835919/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Basin Arctic Global warming |
genre_facet |
Arctic Basin Arctic Global warming |
op_source |
Journal Name: Journal of Geophysical Research--Biogeosciences; Journal Volume: 116; Journal Issue: G1 |
op_relation |
rep-no: LBNL-4239E grantno: DE-AC02-05CH11231 doi:10.1029/2010JG001300 osti: 1004697 https://digital.library.unt.edu/ark:/67531/metadc835919/ ark: ark:/67531/metadc835919 |
op_doi |
https://doi.org/10.1029/2010JG001300 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
container_issue |
G1 |
_version_ |
1766303355047510016 |