A model study of the first ventilated regime of the Arctic Ocean during the early Miocene
The tectonic opening of Fram Strait during the Neogene was a significant geological event that transferred the Arctic Ocean from a poorly ventilated enclosed basin, with weak exchange with the North Atlantic, to a fully ventilated ‘‘ocean stage’’. Previous tectonic and physical oceanographic analyse...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/2591 2024-06-23T07:49:06+00:00 A model study of the first ventilated regime of the Arctic Ocean during the early Miocene Thompson, Bijoy Jakobsson, Martin Nilsson, Johan Nycander, Jonas Döös, Kristofer 2012-07-30 application/pdf text/html application/epub+zip text/xml https://polarresearch.net/index.php/polar/article/view/2591 https://doi.org/10.3402/polar.v31i0.10859 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2591/pdf_1 https://polarresearch.net/index.php/polar/article/view/2591/html https://polarresearch.net/index.php/polar/article/view/2591/epub https://polarresearch.net/index.php/polar/article/view/2591/xml https://polarresearch.net/index.php/polar/article/view/2591 doi:10.3402/polar.v31i0.10859 Polar Research; Vol 31 (2012) 1751-8369 Ocean Modeling Miocene Arctic Ocean Palaeoceanography Ocean Ventilation Age Tracer info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftjpolarres https://doi.org/10.3402/polar.v31i0.10859 2024-06-13T23:33:00Z The tectonic opening of Fram Strait during the Neogene was a significant geological event that transferred the Arctic Ocean from a poorly ventilated enclosed basin, with weak exchange with the North Atlantic, to a fully ventilated ‘‘ocean stage’’. Previous tectonic and physical oceanographic analyses suggest that the early Miocene Fram Strait was likely several times narrower and less than half as deep as the present-day 400 km wide and 2550 m deep strait. Here we use an ocean general circulation model with a passive age tracer included to further address the effect of the Fram Strait opening on the early Miocene Arctic Ocean circulation. The model tracer age exhibits strong spatial gradient between the two major Arctic Ocean deep basins: the Eurasian and Amerasian basins. There is a two-layer stratification and the exchange flow through Fram Strait shows a bi-layer structure with a low salinity outflow from the Arctic confined to a relatively thin upper layer and a saline inflow from the North Atlantic below. Our study suggests that although Fram Strait was significantly narrower and shallower during early Miocene, and the ventilation mechanism quite different in our model, the estimated ventilation rates are comparable to the chemical tracer estimates in the present-day Arctic Ocean. Since we achieved ventilation of the Arctic Ocean with a prescribed Fram Strait width of 100 km and sill depth of 1000 m, ventilation may have preceded the timing of a full ocean depth connection between the Arctic Ocean and North Atlantic established through seafloor spreading and the development of the Lena Trough.Keywords: Ocean modelling; Miocene Arctic Ocean; palaeoceanography; ocean ventilation; age tracer(Published: 30 July 2012)Citation: Polar Research 2012, 31, 10859, http://dx.doi.org/10.3402/polar.v31i0.10859 Article in Journal/Newspaper Arctic Arctic Ocean Fram Strait North Atlantic Polar Research Polar Research Arctic Arctic Ocean Polar Research 31 1 10859 |
institution |
Open Polar |
collection |
Polar Research |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Ocean Modeling Miocene Arctic Ocean Palaeoceanography Ocean Ventilation Age Tracer |
spellingShingle |
Ocean Modeling Miocene Arctic Ocean Palaeoceanography Ocean Ventilation Age Tracer Thompson, Bijoy Jakobsson, Martin Nilsson, Johan Nycander, Jonas Döös, Kristofer A model study of the first ventilated regime of the Arctic Ocean during the early Miocene |
topic_facet |
Ocean Modeling Miocene Arctic Ocean Palaeoceanography Ocean Ventilation Age Tracer |
description |
The tectonic opening of Fram Strait during the Neogene was a significant geological event that transferred the Arctic Ocean from a poorly ventilated enclosed basin, with weak exchange with the North Atlantic, to a fully ventilated ‘‘ocean stage’’. Previous tectonic and physical oceanographic analyses suggest that the early Miocene Fram Strait was likely several times narrower and less than half as deep as the present-day 400 km wide and 2550 m deep strait. Here we use an ocean general circulation model with a passive age tracer included to further address the effect of the Fram Strait opening on the early Miocene Arctic Ocean circulation. The model tracer age exhibits strong spatial gradient between the two major Arctic Ocean deep basins: the Eurasian and Amerasian basins. There is a two-layer stratification and the exchange flow through Fram Strait shows a bi-layer structure with a low salinity outflow from the Arctic confined to a relatively thin upper layer and a saline inflow from the North Atlantic below. Our study suggests that although Fram Strait was significantly narrower and shallower during early Miocene, and the ventilation mechanism quite different in our model, the estimated ventilation rates are comparable to the chemical tracer estimates in the present-day Arctic Ocean. Since we achieved ventilation of the Arctic Ocean with a prescribed Fram Strait width of 100 km and sill depth of 1000 m, ventilation may have preceded the timing of a full ocean depth connection between the Arctic Ocean and North Atlantic established through seafloor spreading and the development of the Lena Trough.Keywords: Ocean modelling; Miocene Arctic Ocean; palaeoceanography; ocean ventilation; age tracer(Published: 30 July 2012)Citation: Polar Research 2012, 31, 10859, http://dx.doi.org/10.3402/polar.v31i0.10859 |
format |
Article in Journal/Newspaper |
author |
Thompson, Bijoy Jakobsson, Martin Nilsson, Johan Nycander, Jonas Döös, Kristofer |
author_facet |
Thompson, Bijoy Jakobsson, Martin Nilsson, Johan Nycander, Jonas Döös, Kristofer |
author_sort |
Thompson, Bijoy |
title |
A model study of the first ventilated regime of the Arctic Ocean during the early Miocene |
title_short |
A model study of the first ventilated regime of the Arctic Ocean during the early Miocene |
title_full |
A model study of the first ventilated regime of the Arctic Ocean during the early Miocene |
title_fullStr |
A model study of the first ventilated regime of the Arctic Ocean during the early Miocene |
title_full_unstemmed |
A model study of the first ventilated regime of the Arctic Ocean during the early Miocene |
title_sort |
model study of the first ventilated regime of the arctic ocean during the early miocene |
publisher |
Norwegian Polar Institute |
publishDate |
2012 |
url |
https://polarresearch.net/index.php/polar/article/view/2591 https://doi.org/10.3402/polar.v31i0.10859 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Fram Strait North Atlantic Polar Research |
genre_facet |
Arctic Arctic Ocean Fram Strait North Atlantic Polar Research |
op_source |
Polar Research; Vol 31 (2012) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2591/pdf_1 https://polarresearch.net/index.php/polar/article/view/2591/html https://polarresearch.net/index.php/polar/article/view/2591/epub https://polarresearch.net/index.php/polar/article/view/2591/xml https://polarresearch.net/index.php/polar/article/view/2591 doi:10.3402/polar.v31i0.10859 |
op_doi |
https://doi.org/10.3402/polar.v31i0.10859 |
container_title |
Polar Research |
container_volume |
31 |
container_issue |
1 |
container_start_page |
10859 |
_version_ |
1802639365208276992 |