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A model study of the first ventilated regime of the Arctic Ocean during the early Miocene
Stockholm Univ, Dept Geol Sci, SE-10691 Stockholm, Sweden..
Stockholm Univ, Dept Geol Sci, SE-10691 Stockholm, Sweden..
Stockholm Univ, Dept Meteorol, SE-10691 Stockholm, Sweden..
Stockholm Univ, Dept Meteorol, SE-10691 Stockholm, Sweden..
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2012 (English)In: Polar Research, ISSN 0800-0395, E-ISSN 1751-8369, Vol. 31, 10859Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 31, 10859
Keyword [en]
Ocean modelling, Miocene Arctic Ocean, palaeoceanography, ocean ventilation, age tracer
National Category
Natural Sciences
Research subject
SWEDARCTIC 2004, ACEX
Identifiers
URN: urn:nbn:se:polar:diva-2377DOI: 10.3402/polar.v31i0.10859ISI: 000307020600001OAI: oai:DiVA.org:polar-2377DiVA: diva2:859077
Available from: 2015-10-06 Created: 2015-10-06 Last updated: 2016-11-11

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  • apa
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