Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean
The thermal state of the lithosphere and related geothermal heat flow (GHF) is a crucial parameter to understand a variety of processes related to cryospheric, geospheric, and/or biospheric interactions. Indirect estimates of GHF in polar regions from magnetic, seismological, or petrological data of...
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ftdoajarticles:oai:doaj.org/article:0644e0c26f114ee0aae0538eda22ff91 2023-05-15T13:57:35+02:00 Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean Ricarda Dziadek Mechthild Doll Fynn Warnke Vera Schlindwein 2020-12-01T00:00:00Z https://doi.org/10.3390/geosciences11010011 https://doaj.org/article/0644e0c26f114ee0aae0538eda22ff91 EN eng MDPI AG https://www.mdpi.com/2076-3263/11/1/11 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences11010011 2076-3263 https://doaj.org/article/0644e0c26f114ee0aae0538eda22ff91 Geosciences, Vol 11, Iss 11, p 11 (2020) geothermal heat flow in situ temperature measurements Antarctica Arctic Ocean Weddell Sea Powell Basin Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.3390/geosciences11010011 2022-12-30T22:04:13Z The thermal state of the lithosphere and related geothermal heat flow (GHF) is a crucial parameter to understand a variety of processes related to cryospheric, geospheric, and/or biospheric interactions. Indirect estimates of GHF in polar regions from magnetic, seismological, or petrological data often show large discrepancies when compared to thermal in situ observations. Here, the lack of in situ data represents a fundamental limitation for both investigating thermal processes of the lithosphere and validating indirect heat flow estimates. During RV Polarstern expeditions PS86 and PS118, we obtained in situ thermal measurements and present the derived GHF in key regions, such as the Antarctic Peninsula and the Gakkel Ridge in the Arctic. By comparison with indirect models, our results indicate (1) elevated geothermal heat flow (75 ± 5 mW m −2 to 139 ± 26 mW m −2 ) to the west of the Antarctic Peninsula, which should be considered for future investigations of ice-sheet dynamics and the visco-elastic behavior of the crust. (2) The thermal signature of the Powell Basin characteristic for oceanic crust of an age between 32 and 18 Ma. Further, we propose (3) that at different heat sources at the slow-spreading Gakkel Ridge in the Aurora Vent Field region might explain the geothermal heat flow distribution. We conclude that in situ observations are urgently required to ground-truth and fine-tune existing models and that a multidisciplinary approach is of high importance for the scientific community’s understanding of this parameter. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Arctic Ocean Ice Sheet Weddell Sea Directory of Open Access Journals: DOAJ Articles Arctic Antarctic The Antarctic Arctic Ocean Antarctic Peninsula Weddell Sea Weddell Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Powell Basin ENVELOPE(-49.500,-49.500,-62.250,-62.250) Geosciences 11 1 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
geothermal heat flow in situ temperature measurements Antarctica Arctic Ocean Weddell Sea Powell Basin Geology QE1-996.5 |
spellingShingle |
geothermal heat flow in situ temperature measurements Antarctica Arctic Ocean Weddell Sea Powell Basin Geology QE1-996.5 Ricarda Dziadek Mechthild Doll Fynn Warnke Vera Schlindwein Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean |
topic_facet |
geothermal heat flow in situ temperature measurements Antarctica Arctic Ocean Weddell Sea Powell Basin Geology QE1-996.5 |
description |
The thermal state of the lithosphere and related geothermal heat flow (GHF) is a crucial parameter to understand a variety of processes related to cryospheric, geospheric, and/or biospheric interactions. Indirect estimates of GHF in polar regions from magnetic, seismological, or petrological data often show large discrepancies when compared to thermal in situ observations. Here, the lack of in situ data represents a fundamental limitation for both investigating thermal processes of the lithosphere and validating indirect heat flow estimates. During RV Polarstern expeditions PS86 and PS118, we obtained in situ thermal measurements and present the derived GHF in key regions, such as the Antarctic Peninsula and the Gakkel Ridge in the Arctic. By comparison with indirect models, our results indicate (1) elevated geothermal heat flow (75 ± 5 mW m −2 to 139 ± 26 mW m −2 ) to the west of the Antarctic Peninsula, which should be considered for future investigations of ice-sheet dynamics and the visco-elastic behavior of the crust. (2) The thermal signature of the Powell Basin characteristic for oceanic crust of an age between 32 and 18 Ma. Further, we propose (3) that at different heat sources at the slow-spreading Gakkel Ridge in the Aurora Vent Field region might explain the geothermal heat flow distribution. We conclude that in situ observations are urgently required to ground-truth and fine-tune existing models and that a multidisciplinary approach is of high importance for the scientific community’s understanding of this parameter. |
format |
Article in Journal/Newspaper |
author |
Ricarda Dziadek Mechthild Doll Fynn Warnke Vera Schlindwein |
author_facet |
Ricarda Dziadek Mechthild Doll Fynn Warnke Vera Schlindwein |
author_sort |
Ricarda Dziadek |
title |
Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean |
title_short |
Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean |
title_full |
Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean |
title_fullStr |
Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean |
title_full_unstemmed |
Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean |
title_sort |
towards closing the polar gap: new marine heat flow observations in antarctica and the arctic ocean |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/geosciences11010011 https://doaj.org/article/0644e0c26f114ee0aae0538eda22ff91 |
long_lat |
ENVELOPE(90.000,90.000,87.000,87.000) ENVELOPE(-49.500,-49.500,-62.250,-62.250) |
geographic |
Arctic Antarctic The Antarctic Arctic Ocean Antarctic Peninsula Weddell Sea Weddell Gakkel Ridge Powell Basin |
geographic_facet |
Arctic Antarctic The Antarctic Arctic Ocean Antarctic Peninsula Weddell Sea Weddell Gakkel Ridge Powell Basin |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Arctic Ocean Ice Sheet Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Arctic Ocean Ice Sheet Weddell Sea |
op_source |
Geosciences, Vol 11, Iss 11, p 11 (2020) |
op_relation |
https://www.mdpi.com/2076-3263/11/1/11 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences11010011 2076-3263 https://doaj.org/article/0644e0c26f114ee0aae0538eda22ff91 |
op_doi |
https://doi.org/10.3390/geosciences11010011 |
container_title |
Geosciences |
container_volume |
11 |
container_issue |
1 |
container_start_page |
11 |
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1766265289289236480 |