In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics
An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Source at https://doi.org/10.1002/2017GC007288 . During expedition MARIA S. MERIAN MSM57/2 to the Svalbard margin offshore Prins Karls Forland, the seafloor drill rig MARUM‐MeBo70 was used to assess the...
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Online Access: | https://hdl.handle.net/10037/13859 https://doi.org/10.1002/2017GC007288 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13859 2023-05-15T14:27:10+02:00 In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics Riedel, M. Wallmann, K. Berndt, C Pape, T. Freudenthal, T. Bergenthal, M. Bünz, Stefan Bohrmann, G. 2018-03-30 https://hdl.handle.net/10037/13859 https://doi.org/10.1002/2017GC007288 eng eng American Geophysical Union (AGU) Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Riedel, M., Wallmann, K., Berndt, C., Pape, T., Freudenthal, T., Bergenthal, M., . Bohrmann, G. (2018). In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics. Geochemistry Geophysics Geosystems, 19(4), 1165-1177. https://doi.org/10.1002/2017GC007288 FRIDAID 1579421 doi:10.1002/2017GC007288 1525-2027 https://hdl.handle.net/10037/13859 openAccess VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 gas hydrates Svalbard continental margin in situ temperature data Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1002/2017GC007288 2021-06-25T17:56:09Z An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Source at https://doi.org/10.1002/2017GC007288 . During expedition MARIA S. MERIAN MSM57/2 to the Svalbard margin offshore Prins Karls Forland, the seafloor drill rig MARUM‐MeBo70 was used to assess the landward termination of the gas hydrate system in water depths between 340 and 446 m. The study region shows abundant seafloor gas vents, clustered at a water depth of ∼400 m. The sedimentary environment within the upper 100 m below seafloor (mbsf) is dominated by ice‐berg scours and glacial unconformities. Sediments cored included glacial diamictons and sheet‐sands interbedded with mud. Seismic data show a bottom simulating reflector terminating ∼30 km seaward in ∼760 m water depth before it reaches the theoretical limit of the gas hydrate stability zone (GHSZ) at the drilling transect. We present results of the first in situ temperature measurements conducted with MeBo70 down to 28 mbsf. The data yield temperature gradients between ∼38°C km −1 at the deepest site (446 m) and ∼41°C km −1 at a shallower drill site (390 m). These data constrain combined with in situ pore‐fluid data, sediment porosities, and thermal conductivities the dynamic evolution of the GHSZ during the past 70 years for which bottom water temperature records exist. Gas hydrate is not stable in the sediments at sites shallower than 390 m water depth at the time of acquisition (August 2016). Only at the drill site in 446 m water depth, favorable gas hydrate stability conditions are met (maximum vertical extent of ∼60 mbsf); however, coring did not encounter any gas hydrates. Article in Journal/Newspaper Arctic Prins Karls Forland Svalbard Svalbard margin University of Tromsø: Munin Open Research Archive Prins Karls Forland ENVELOPE(11.175,11.175,78.543,78.543) Svalbard Geochemistry, Geophysics, Geosystems 19 4 1165 1177 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 gas hydrates Svalbard continental margin in situ temperature data |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 gas hydrates Svalbard continental margin in situ temperature data Riedel, M. Wallmann, K. Berndt, C Pape, T. Freudenthal, T. Bergenthal, M. Bünz, Stefan Bohrmann, G. In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 gas hydrates Svalbard continental margin in situ temperature data |
description |
An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Source at https://doi.org/10.1002/2017GC007288 . During expedition MARIA S. MERIAN MSM57/2 to the Svalbard margin offshore Prins Karls Forland, the seafloor drill rig MARUM‐MeBo70 was used to assess the landward termination of the gas hydrate system in water depths between 340 and 446 m. The study region shows abundant seafloor gas vents, clustered at a water depth of ∼400 m. The sedimentary environment within the upper 100 m below seafloor (mbsf) is dominated by ice‐berg scours and glacial unconformities. Sediments cored included glacial diamictons and sheet‐sands interbedded with mud. Seismic data show a bottom simulating reflector terminating ∼30 km seaward in ∼760 m water depth before it reaches the theoretical limit of the gas hydrate stability zone (GHSZ) at the drilling transect. We present results of the first in situ temperature measurements conducted with MeBo70 down to 28 mbsf. The data yield temperature gradients between ∼38°C km −1 at the deepest site (446 m) and ∼41°C km −1 at a shallower drill site (390 m). These data constrain combined with in situ pore‐fluid data, sediment porosities, and thermal conductivities the dynamic evolution of the GHSZ during the past 70 years for which bottom water temperature records exist. Gas hydrate is not stable in the sediments at sites shallower than 390 m water depth at the time of acquisition (August 2016). Only at the drill site in 446 m water depth, favorable gas hydrate stability conditions are met (maximum vertical extent of ∼60 mbsf); however, coring did not encounter any gas hydrates. |
format |
Article in Journal/Newspaper |
author |
Riedel, M. Wallmann, K. Berndt, C Pape, T. Freudenthal, T. Bergenthal, M. Bünz, Stefan Bohrmann, G. |
author_facet |
Riedel, M. Wallmann, K. Berndt, C Pape, T. Freudenthal, T. Bergenthal, M. Bünz, Stefan Bohrmann, G. |
author_sort |
Riedel, M. |
title |
In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics |
title_short |
In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics |
title_full |
In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics |
title_fullStr |
In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics |
title_full_unstemmed |
In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics |
title_sort |
in situ temperature measurements at the svalbard continental margin: implications for gas hydrate dynamics |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/13859 https://doi.org/10.1002/2017GC007288 |
long_lat |
ENVELOPE(11.175,11.175,78.543,78.543) |
geographic |
Prins Karls Forland Svalbard |
geographic_facet |
Prins Karls Forland Svalbard |
genre |
Arctic Prins Karls Forland Svalbard Svalbard margin |
genre_facet |
Arctic Prins Karls Forland Svalbard Svalbard margin |
op_relation |
Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Riedel, M., Wallmann, K., Berndt, C., Pape, T., Freudenthal, T., Bergenthal, M., . Bohrmann, G. (2018). In Situ Temperature Measurements at the Svalbard Continental Margin: Implications for Gas Hydrate Dynamics. Geochemistry Geophysics Geosystems, 19(4), 1165-1177. https://doi.org/10.1002/2017GC007288 FRIDAID 1579421 doi:10.1002/2017GC007288 1525-2027 https://hdl.handle.net/10037/13859 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2017GC007288 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
19 |
container_issue |
4 |
container_start_page |
1165 |
op_container_end_page |
1177 |
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1766300771076276224 |