Climate Dynamics

, Volume 38, Issue 11–12, pp 2377–2388

A multimodel comparison of centennial Atlantic meridional overturning circulation variability

  • Matthew B. Menary
  • Wonsun Park
  • Katja Lohmann
  • Michael Vellinga
  • Matthew D. Palmer
  • Mojib Latif
  • Johann H. Jungclaus
Article

Abstract

A mechanism contributing to centennial variability of the Atlantic Meridional Overturning Circulation (AMOC) is tested with multi-millennial control simulations of several coupled general circulation models (CGCMs). These are a substantially extended integration of the 3rd Hadley Centre Coupled Climate Model (HadCM3), the Kiel Climate Model (KCM), and the Max Plank Institute Earth System Model (MPI-ESM). Significant AMOC variability on time scales of around 100 years is simulated in these models. The centennial mechanism links changes in the strength of the AMOC with oceanic salinities and surface temperatures, and atmospheric phenomena such as the Intertropical Convergence Zone (ITCZ). 2 of the 3 models reproduce all aspects of the mechanism, with the third (MPI-ESM) reproducing most of them. A comparison with a high resolution paleo-proxy for Sea Surface Temperatures (SSTs) north of Iceland over the last 4,000 years, also linked to the ITCZ, suggests that elements of this mechanism may also be detectable in the real world.

Keywords

AMOC MOC Overturning North Atlantic Centennial variability ITCZ 

Copyright information

© Crown Copyright 2011

Authors and Affiliations

  • Matthew B. Menary
    • 1
  • Wonsun Park
    • 2
  • Katja Lohmann
    • 3
  • Michael Vellinga
    • 1
  • Matthew D. Palmer
    • 1
  • Mojib Latif
    • 2
  • Johann H. Jungclaus
    • 3
  1. 1.Met Office Hadley CentreExeter, DevonUnited Kingdom
  2. 2.IFM-GEOMAR, Leibniz-Institut fuer MeereswissenschaftenKielGermany
  3. 3.Max Planck Inst MeteorolHamburgGermany

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