The late quaternary flow through the bering strait has been forced by the Southern Ocean winds

Joseph D. Ortizj, Doron Nof, Leonid Polyak, Guillaume St-Onge, Agathe Lisé-pronovost, Sathy Naidu, Dennis Darby, Stefanie Brachfeld

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Because North and South America are surrounded by water, they constitute together a gigantic island whose peripheral sea level is controlled by the winds east of the island, winds along the western boundary of the island, the freshwater flux, and the meridional overturning cell. This idea has been expressed in several articles where a series of analytical models show that the Bering Strait (BS) flow is controlled by the interplay of the Southern Winds (sometimes referredto as the "Subantarctic Westerlies"), and theNorth Hemisphere freshwater flux. Here, the authors report a paleoceanographic analysis of proxies in the BS as well as the Southern Ocean, which clearly support the above through employment of a slowly varying time-dependent version of the coupled Sandal-Nof model. This study shows a very strong correlation between the Southern Ocean winds and the BS flow. A mid-Holocene weakening of the Southern Winds followed by thecession of freshwater fluxes from the melting Laurentide ice sheet strengthened the BS flow for several thousandyears. Increasing the Southern Winds enhances the near surface, cross-equatorial flow fromthe Southern Ocean to the Northern Hemisphere. This cross-equatorial flow decreases the Arctic outflow into the Atlantic demonstrating a dynamic linkage between the Southern Ocean Winds and the mean flow through the BS.

Original languageEnglish
Pages (from-to)2014-2029
Number of pages16
JournalJournal of Physical Oceanography
Volume42
Issue number11
DOIs
StatePublished - Nov 1 2012

ASJC Scopus subject areas

  • Oceanography

Keywords

  • Airflow
  • Atmosphere-ocean interaction
  • Fluxes
  • Forcing
  • Ocean models
  • Wind

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