Multidecadal preconditioning of the Maud Rise polynya region

van Westen, René M.; Dijkstra, Henk A.

In this paper, we consider Maud Rise polynya formation in a long (250-year) high-resolution (ocean 0.1inline-formula, atmosphere 0.5inline-formula horizontal model resolution) of the Community Earth System Model. We find a dominant multidecadal timescale in the occurrence of these Maud Rise polynyas. Analysis of the results leads us to the interpretation that a preferred timescale can be induced by the variability of the Weddell Gyre, previously identified as the Southern Ocean Mode. The large-scale pattern of heat content variability associated with the Southern Ocean Mode modifies the stratification in the Maud Rise region and leads to a preferred timescale in convection through preconditioning of the subsurface density and consequently to polynya formation.

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van Westen, René M. / Dijkstra, Henk A.: Multidecadal preconditioning of the Maud Rise polynya region. 2020. Copernicus Publications.

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Rechteinhaber: René M. van Westen

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