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Evidence for Atlantic Ocean forcing the atmosphere and the negative role of model bias
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Journal Article
Evidence for Atlantic Ocean forcing the atmosphere and the negative role of model bias
2025
Overview
There is agreement on how the North Atlantic Oscillation forces the Atlantic Meridional Overturning Circulation, but the existence of a reversed interaction is widely disputed. Here, we investigate this type of ocean forcing the atmosphere by analysing several high- and low-resolution coupled climate models, ocean observations and reanalyses products of ocean and atmosphere. We find that in observations and about 50% of the coupled climate models, an ocean-forced negative North Atlantic Oscillation occurs at a lag of 5 years after the Atlantic Meridional Overturning Circulation peaks. Climate models with a strong cold temperature bias in the subpolar gyre and a positive sea-ice cover bias in the Atlantic and Arctic Ocean are unable to correctly simulate the heat flux pattern, resulting from the northward propagation of warm ocean temperatures, that forces the atmosphere. Efforts to remove this bias could therefore lead to substantial improvement in current decadal prediction systems.
The negative North Atlantic Oscillation occurs around 5 years after the Atlantic Meridional Overturning Circulation peaks, coinciding with a positive North Atlantic Oscillation, according to a state-of-the-art multi-model ensemble as well as observational data.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
