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Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model

Citation

Schulz, M and Prange, M and Klocker, A, Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model, Climate of the Past, 3 pp. 97-107. ISSN 1814-9324 (2007) [Refereed Article]


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Copyright Statement

Copyright 2007 The Authors-distributed under the terms of Creative Commons License (CC BY 3.0).

Official URL: http://dx.doi.org/

Abstract

Using a 3-dimensional climate model of intermediate complexity we show that the overturning circulation of the Atlantic Ocean can vary at multicentennial-to-millennial timescales for modern boundary conditions. A continuous freshwater perturbation in the Labrador Sea pushes the overturning circulation of the Atlantic Ocean into a bi-stable regime, characterized by phases of active and inactive deepwater formation in the Labrador Sea. In contrast, deep-water formation in the Nordic Seas is active during all phases of the oscillations. The actual timing of the transitions between the two circulation states occurs randomly. The oscillations constitute a 3-dimensional phenomenon and have to be distinguished from low-frequency oscillations seen previously in 2-dimensional models of the ocean. A conceptual model provides further insight into the essential dynamics underlying the oscillations of the large-scale ocean circulation. The model experiments indicate that the coupled climate system can exhibit unforced climate variability at multicentennial-to-millennial timescales that may be of relevance for Holocene climate variations.

Item Details

Item Type:Refereed Article
Keywords:low-frequency oscilaltions atlantic meridional overturning circulation
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
Author:Klocker, A (Dr Andreas Klocker)
ID Code:91592
Year Published:2007
Deposited By:IMAS Research and Education Centre
Deposited On:2014-05-22
Last Modified:2014-06-10
Downloads:166 View Download Statistics

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