Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway
Permafrost has become an increasingly important subject in the High Arctic archipelago of Svalbard. However, whilst the uppermost permafrost intervals have been well studied, the processes at its base and the impacts of the underlying geology have been largely overlooked. More than a century of coal...
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ftcopernicus:oai:publications.copernicus.org:tcd96455 2023-05-15T14:28:53+02:00 Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway Birchall, Thomas Jochmann, Malte Betlem, Peter Senger, Kim Hodson, Andrew Olaussen, Snorre 2021-08-09 application/pdf https://doi.org/10.5194/tc-2021-226 https://tc.copernicus.org/preprints/tc-2021-226/ eng eng doi:10.5194/tc-2021-226 https://tc.copernicus.org/preprints/tc-2021-226/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-2021-226 2021-08-16T16:22:29Z Permafrost has become an increasingly important subject in the High Arctic archipelago of Svalbard. However, whilst the uppermost permafrost intervals have been well studied, the processes at its base and the impacts of the underlying geology have been largely overlooked. More than a century of coal, hydrocarbon and scientific drilling through the permafrost interval shows that accumulations of natural gas trapped at the base permafrost is common. They exist throughout Svalbard in several stratigraphic intervals and show both thermogenic and biogenic origins. These accumulations combined with the relatively young permafrost age indicate gas migration, driven by isostatic rebound, is presently ongoing throughout Svalbard. The accumulation sizes are uncertain, but one case demonstrably produced several million cubic metres of gas over eight years. Gas encountered in two boreholes on the island of Hopen appears to be situated in the gas hydrate stability zone and thusly extremely voluminous. While permafrost is demonstrably ice-saturated and acting as seal to gas in lowland areas, in the highlands it appears to be more complex, and often dry and permeable. Svalbard shares a similar geological and glacial history with much of the Circum-Arctic meaning that sub-permafrost gas accumulations are regionally common. With permafrost thawing in arctic regions, there is a risk that the impacts of releasing of sub-permafrost trapped methane is largely overlooked when assessing positive climatic feedback effects. Text Arctic Archipelago Arctic Hopen Ice permafrost Svalbard Hopen Copernicus Publications: E-Journals Arctic Hopen ENVELOPE(9.279,9.279,63.379,63.379) Norway Svalbard |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Permafrost has become an increasingly important subject in the High Arctic archipelago of Svalbard. However, whilst the uppermost permafrost intervals have been well studied, the processes at its base and the impacts of the underlying geology have been largely overlooked. More than a century of coal, hydrocarbon and scientific drilling through the permafrost interval shows that accumulations of natural gas trapped at the base permafrost is common. They exist throughout Svalbard in several stratigraphic intervals and show both thermogenic and biogenic origins. These accumulations combined with the relatively young permafrost age indicate gas migration, driven by isostatic rebound, is presently ongoing throughout Svalbard. The accumulation sizes are uncertain, but one case demonstrably produced several million cubic metres of gas over eight years. Gas encountered in two boreholes on the island of Hopen appears to be situated in the gas hydrate stability zone and thusly extremely voluminous. While permafrost is demonstrably ice-saturated and acting as seal to gas in lowland areas, in the highlands it appears to be more complex, and often dry and permeable. Svalbard shares a similar geological and glacial history with much of the Circum-Arctic meaning that sub-permafrost gas accumulations are regionally common. With permafrost thawing in arctic regions, there is a risk that the impacts of releasing of sub-permafrost trapped methane is largely overlooked when assessing positive climatic feedback effects. |
format |
Text |
author |
Birchall, Thomas Jochmann, Malte Betlem, Peter Senger, Kim Hodson, Andrew Olaussen, Snorre |
spellingShingle |
Birchall, Thomas Jochmann, Malte Betlem, Peter Senger, Kim Hodson, Andrew Olaussen, Snorre Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway |
author_facet |
Birchall, Thomas Jochmann, Malte Betlem, Peter Senger, Kim Hodson, Andrew Olaussen, Snorre |
author_sort |
Birchall, Thomas |
title |
Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway |
title_short |
Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway |
title_full |
Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway |
title_fullStr |
Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway |
title_full_unstemmed |
Review Article: Permafrost Trapped Natural Gas in Svalbard, Norway |
title_sort |
review article: permafrost trapped natural gas in svalbard, norway |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-2021-226 https://tc.copernicus.org/preprints/tc-2021-226/ |
long_lat |
ENVELOPE(9.279,9.279,63.379,63.379) |
geographic |
Arctic Hopen Norway Svalbard |
geographic_facet |
Arctic Hopen Norway Svalbard |
genre |
Arctic Archipelago Arctic Hopen Ice permafrost Svalbard Hopen |
genre_facet |
Arctic Archipelago Arctic Hopen Ice permafrost Svalbard Hopen |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2021-226 https://tc.copernicus.org/preprints/tc-2021-226/ |
op_doi |
https://doi.org/10.5194/tc-2021-226 |
_version_ |
1766303027085443072 |