Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories
Changes in ocean gateway configuration can induce basin-scale rearrangements in ocean current characteristics. However, there is large uncertainty in the relative timing of the Oligocene/Miocene subsidence histories of the Greenland-Scotland Ridge (GSR) and the Fram Strait (FS). By using a climate m...
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ftdatacite:10.23689/fidgeo-4589 2023-05-15T14:58:32+02:00 Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories Hossain, Akil Knorr, Gregor Lohmann, Gerrit Stärz, Michael Jokat, Wilfried 2020 https://dx.doi.org/10.23689/fidgeo-4589 https://e-docs.geo-leo.de/handle/11858/8935 en eng FID GEO Article article-journal Text ScholarlyArticle 2020 ftdatacite https://doi.org/10.23689/fidgeo-4589 2022-02-08T11:58:38Z Changes in ocean gateway configuration can induce basin-scale rearrangements in ocean current characteristics. However, there is large uncertainty in the relative timing of the Oligocene/Miocene subsidence histories of the Greenland-Scotland Ridge (GSR) and the Fram Strait (FS). By using a climate model, we investigate the temperature and salinity changes in response to the subsidence of these two key ocean gateways during early to middle Miocene. For a singular subsidence of the GSR, we detect warming and a salinity increase in the Nordic Seas and the Arctic Ocean. As convection sites shift to the north of Iceland, North Atlantic Deep Water (NADW) is formed at cooler temperatures. The associated deep ocean cooling and upwelling of deep waters to the Southern Ocean surface can cause a cooling in the southern high latitudes. These characteristic responses to the GSR deepening are independent of the FS being shallow or deep. An isolated subsidence of the FS gateway for a deep GSR shows less pronounced warming and salinity increase in the Nordic Seas. Arctic temperatures remain unaltered, but a stronger salinity increase is detected, which further increases the density of NADW. The increase in salinity enhances the contribution of NADW to the abyssal ocean at the expense of the colder southern source water component. These relative changes largely counteract each other and cause a negligible warming in the upwelling regions of the Southern Ocean. Text Arctic Arctic Ocean Fram Strait Greenland Greenland-Scotland Ridge Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Arctic Arctic Ocean Greenland Southern Ocean |
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DataCite Metadata Store (German National Library of Science and Technology) |
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English |
description |
Changes in ocean gateway configuration can induce basin-scale rearrangements in ocean current characteristics. However, there is large uncertainty in the relative timing of the Oligocene/Miocene subsidence histories of the Greenland-Scotland Ridge (GSR) and the Fram Strait (FS). By using a climate model, we investigate the temperature and salinity changes in response to the subsidence of these two key ocean gateways during early to middle Miocene. For a singular subsidence of the GSR, we detect warming and a salinity increase in the Nordic Seas and the Arctic Ocean. As convection sites shift to the north of Iceland, North Atlantic Deep Water (NADW) is formed at cooler temperatures. The associated deep ocean cooling and upwelling of deep waters to the Southern Ocean surface can cause a cooling in the southern high latitudes. These characteristic responses to the GSR deepening are independent of the FS being shallow or deep. An isolated subsidence of the FS gateway for a deep GSR shows less pronounced warming and salinity increase in the Nordic Seas. Arctic temperatures remain unaltered, but a stronger salinity increase is detected, which further increases the density of NADW. The increase in salinity enhances the contribution of NADW to the abyssal ocean at the expense of the colder southern source water component. These relative changes largely counteract each other and cause a negligible warming in the upwelling regions of the Southern Ocean. |
format |
Text |
author |
Hossain, Akil Knorr, Gregor Lohmann, Gerrit Stärz, Michael Jokat, Wilfried |
spellingShingle |
Hossain, Akil Knorr, Gregor Lohmann, Gerrit Stärz, Michael Jokat, Wilfried Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories |
author_facet |
Hossain, Akil Knorr, Gregor Lohmann, Gerrit Stärz, Michael Jokat, Wilfried |
author_sort |
Hossain, Akil |
title |
Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories |
title_short |
Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories |
title_full |
Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories |
title_fullStr |
Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories |
title_full_unstemmed |
Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories |
title_sort |
simulated thermohaline fingerprints in response to different greenland-scotland ridge and fram strait subsidence histories |
publisher |
FID GEO |
publishDate |
2020 |
url |
https://dx.doi.org/10.23689/fidgeo-4589 https://e-docs.geo-leo.de/handle/11858/8935 |
geographic |
Arctic Arctic Ocean Greenland Southern Ocean |
geographic_facet |
Arctic Arctic Ocean Greenland Southern Ocean |
genre |
Arctic Arctic Ocean Fram Strait Greenland Greenland-Scotland Ridge Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Arctic Arctic Ocean Fram Strait Greenland Greenland-Scotland Ridge Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Southern Ocean |
op_doi |
https://doi.org/10.23689/fidgeo-4589 |
_version_ |
1766330674637176832 |