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Mechanisms of Atlantic Meridional Overturning Circulation Variability Simulated by the Nemo Model : Volume 10, Issue 4 (14/07/2014)

By Stepanov, V. N.

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Book Id: WPLBN0004020213
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Mechanisms of Atlantic Meridional Overturning Circulation Variability Simulated by the Nemo Model : Volume 10, Issue 4 (14/07/2014)  
Author: Stepanov, V. N.
Volume: Vol. 10, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Stepanov, V. N., & Haines, K. (2014). Mechanisms of Atlantic Meridional Overturning Circulation Variability Simulated by the Nemo Model : Volume 10, Issue 4 (14/07/2014). Retrieved from

Description: Dept. of Meteorology, University of Reading, Reading, UK. We have investigated mechanisms for the Atlantic Meridional Overturning Circulation (AMOC) variability at 26.5° N (other than the Ekman component) that can be related to external forcings, in particular wind variability. Resolution dependence is studied using identical experiments with 1° and 1/4° NEMO model runs over 1960–2010.

The analysis shows that much of the variability in the AMOC at 26° N can be related to the wind strength over the North Atlantic, through mechanisms lagged on different timescales. At ~ 1-year lag the January–June difference of mean sea level pressure between high and mid-latitudes in the North Atlantic explains 35–50% of the interannual AMOC variability (with negative correlation between wind strength and AMOC). At longer lead timescales ~ 4 years, strong (weak) winds over the northern North Atlantic (specifically linked to the NAO index) are followed by higher (lower) AMOC transport, but this mechanism only works in the 1/4° model. Analysis of the density correlations suggests an increase (decrease) in deep water formation in the North Atlantic subpolar gyre to be the cause. Therefore another 30% of the AMOC variability at 26° N can be related to density changes in the top 1000 m in the Labrador and Irminger seas occurring ~ 4 years earlier.

Mechanisms of Atlantic Meridional Overturning Circulation variability simulated by the NEMO model

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