Pliocene palaeoceanography of the Arctic Ocean and subarctic seas

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doi: 10.1098/rsta.2008.0203
Author(s): Matthiessen, Jens; Knies, Jochen; Vogt, Christoph; Stein, Ruediger
Author Affiliation(s): Primary:
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Federal Republic of Germany
U. S. Geological Survey, United States
University of Bristol, United Kingdom
Geological Survey of Norway, Norway
University of Bremen, Federal Republic of Germany
Volume Title: Pliocene; a vision of Earth in the late twenty-first century?
Volume Author(s): Haywood, Alan M., editor; Dowsett, Harry J.; Valdes, Paul J.
Source: The Pliocene; a vision of Earth in the late twenty-first century?, edited by Alan M. Haywood, Harry J. Dowsett and Paul J. Valdes. Philosophical Transactions - Royal Society. Mathematical, Physical and Engineering Sciences, 367(1886), p.21-48. Publisher: Royal Society of London, London, United Kingdom. ISSN: 1364-503X CODEN: PTRMAD
Note: In English. 145 refs.; illus., incl. sketch map
Summary: The Pliocene is important in the geological evolution of the high northern latitudes. It marks the transition from restricted local- to extensive regional-scale glaciations on the circum-Arctic continents between 3.6 and 2.4 Ma. Since the Arctic Ocean is an almost land-locked basin, tectonic activity and sea-level fluctuations controlled the geometry of ocean gateways and continental drainage systems, and exerted a major influence on the formation of continental ice sheets, the distribution of river run-off, and the circulation and water mass characteristics in the Arctic Ocean. The effect of a water mass exchange restricted to the Bering and Fram Straits on the oceanography is unknown, but modelling experiments suggest that this must have influenced the Atlantic meridional overturning circulation. Cold conditions associated with perennial sea-ice cover might have prevailed in the central Arctic Ocean throughout the Pliocene, whereas colder periods alternated with warmer seasonally ice-free periods in the marginal areas. The most pronounced oceanographic change occurred in the Mid-Pliocene when the circulation through the Bering Strait reversed and low-salinity waters increasingly flowed from the North Pacific into the Arctic Ocean. The excess freshwater supply might have facilitated sea-ice formation and contributed to a decrease in the Atlantic overturning circulation.
Year of Publication: 2009
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Arctic Ocean; Biostratigraphy; Boreholes; Cenozoic; Chemostratigraphy; Chronostratigraphy; Cores; Fresh water; Glaciation; Ice; Magnetostratigraphy; Marine sediments; Neogene; Ocean Drilling Program; Ocean circulation; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Pliocene; Sea ice; Sediments; Subarctic regions; Tertiary; Water masses
Record ID: 2009072070
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Royal Society, London, United Kingdom

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