Eddy-induced variability of the meridional overturning circulation in a model of the North Atlantic: Eddy-Induced AMOC variability

Matthew Thomas, X. Zhai

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Abstract

Observations of the Atlantic Meridional Overturning Circulation (AMOC) show that it varies on all timescales. Here we isolate the contribution of eddies to AMOC variability using an eddy-permitting model of the North Atlantic driven by climatological and steady forcing. The eddy-induced AMOC variability is found to be ubiquitous and significant at all latitudes, with a magnitude comparable to the seasonal cycle in the subtropics. Furthermore, the eddy-induced AMOC variability is manifested not only at high frequencies but also at interannual and longer timescales. These results imply that a significant fraction of the AMOC variability is inherently unpredictable at seasonal to interannual timescales.
Original languageEnglish
Pages (from-to)2742-2747
Number of pages6
JournalGeophysical Research Letters
Volume40
Issue number11
DOIs
Publication statusPublished - 16 Jun 2013

Keywords

  • Atlantic Meridional Overturning Circulation
  • eddy variability
  • regional modeling

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