Arctic circulation regimes

Andrey Proshutinsky*, Dmitry Dukhovskoy, Mary Louise Timmermans, Richard Krishfield, Jonathan L. Bamber

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

92 Citations (Scopus)
313 Downloads (Pure)

Abstract

Between 1948 and 1996, mean annual environmental parameters in the Arctic experienced a wellpronounced decadal variability with two basic circulation patterns: cyclonic and anticyclonic alternating at 5 to 7 year intervals. During cyclonic regimes, low sea-level atmospheric pressure (SLP) dominated over the Arctic Ocean driving sea ice and the upper ocean counterclockwise; the Arctic atmosphere was relatively warm and humid, and freshwater flux from the Arctic Ocean towards the subarctic seas was intensified. By contrast, during anticylonic circulation regimes, high SLP dominated driving sea ice and the upper ocean clockwise. Meanwhile, the atmosphere was cold and dry and the freshwater flux from the Arctic to the subarctic seas was reduced. Since 1997, however, the Arctic system has been under the influence of an anticyclonic circulation regime (17 years) with a set of environmental parameters that are atypical for this regime. We discuss a hypothesis explaining the causes and mechanisms regulating the intensity and duration of Arctic circulation regimes, and speculate how changes in freshwater fluxes from the Arctic Ocean and Greenland impact environmental conditions and interrupt their decadal variability.

Original languageEnglish
Article number20140160
Number of pages18
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume373
Issue number2052
Early online date7 Sep 2015
DOIs
Publication statusPublished - 13 Oct 2015

Keywords

  • Arctic climate variability
  • Circulation regimes
  • Freshwater and heat content

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