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...
Published in: | Paleoceanography and Paleoclimatology |
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American Geophysical Union
2020
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Online Access: | https://epic.awi.de/id/eprint/52928/ https://epic.awi.de/id/eprint/52928/1/2019PA003842.pdf https://hdl.handle.net/10013/epic.f820487a-4d85-47cc-8ee2-58f2c89fb9c4 |
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ftawi:oai:epic.awi.de:52928 2024-09-15T17:53:59+00:00 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 2020-05-13 application/pdf https://epic.awi.de/id/eprint/52928/ https://epic.awi.de/id/eprint/52928/1/2019PA003842.pdf https://hdl.handle.net/10013/epic.f820487a-4d85-47cc-8ee2-58f2c89fb9c4 unknown American Geophysical Union https://epic.awi.de/id/eprint/52928/1/2019PA003842.pdf Hossain, A. orcid:0000-0001-8340-3056 , Knorr, G. orcid:0000-0002-8317-5046 , Lohmann, G. orcid:0000-0003-2089-733X , Stärz, M. orcid:0000-0003-0236-5305 and Jokat, W. orcid:0000-0002-7793-5854 (2020) Simulated Thermohaline Fingerprints in Response to Different Greenland‐Scotland Ridge and Fram Strait Subsidence Histories , Paleoceanography and Paleoclimatology, 35 . doi:10.1029/2019PA003842 <https://doi.org/10.1029/2019PA003842> , hdl:10013/epic.f820487a-4d85-47cc-8ee2-58f2c89fb9c4 EPIC3Paleoceanography and Paleoclimatology, American Geophysical Union, 35, ISSN: 2572-4525 Article isiRev info:eu-repo/semantics/article 2020 ftawi https://doi.org/10.1029/2019PA003842 2024-06-24T04:26:11Z 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. Article in Journal/Newspaper Arctic Ocean Fram Strait Greenland Greenland-Scotland Ridge Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Paleoceanography and Paleoclimatology 35 7 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 |
Article in Journal/Newspaper |
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 |
American Geophysical Union |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/52928/ https://epic.awi.de/id/eprint/52928/1/2019PA003842.pdf https://hdl.handle.net/10013/epic.f820487a-4d85-47cc-8ee2-58f2c89fb9c4 |
genre |
Arctic Ocean Fram Strait Greenland Greenland-Scotland Ridge Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Arctic Ocean Fram Strait Greenland Greenland-Scotland Ridge Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
EPIC3Paleoceanography and Paleoclimatology, American Geophysical Union, 35, ISSN: 2572-4525 |
op_relation |
https://epic.awi.de/id/eprint/52928/1/2019PA003842.pdf Hossain, A. orcid:0000-0001-8340-3056 , Knorr, G. orcid:0000-0002-8317-5046 , Lohmann, G. orcid:0000-0003-2089-733X , Stärz, M. orcid:0000-0003-0236-5305 and Jokat, W. orcid:0000-0002-7793-5854 (2020) Simulated Thermohaline Fingerprints in Response to Different Greenland‐Scotland Ridge and Fram Strait Subsidence Histories , Paleoceanography and Paleoclimatology, 35 . doi:10.1029/2019PA003842 <https://doi.org/10.1029/2019PA003842> , hdl:10013/epic.f820487a-4d85-47cc-8ee2-58f2c89fb9c4 |
op_doi |
https://doi.org/10.1029/2019PA003842 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
7 |
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1810430139730755584 |