Antarctic sea ice control on the depth of North Atlantic deep water
(Nadeau, Louis Philippe and Ferrari, Raffaele and Jansen, Malte F.), Journal of Climate, vol. 32, no. 9, pp. pages, 2019.
AbstractChanges in deep ocean circulation and stratification have been argued to contribute to climatic shifts between glacial and interglacial climates by affecting the atmospheric carbon dioxide concentrations. It has been recently proposed that such changes are associated with variations in Antarctic sea ice through two possible mechanisms: an increased latitudinal extent of Antarctic sea ice and an increased rate of Antarctic sea ice formation. Both mechanisms lead to an upward shift of the Atlantic Meridional Overturning Circulation (AMOC) above depths where diapycnal mixing is strong (above 2000 m), thus decoupling the AMOC from the abyssal overturning circulation. Here, these two hypotheses are tested using a series of idealized two-basins ocean simulations. In order to investigate independently the effect of an increased latitudinal ice extent from the effect of an increased ice formation rate, sea ice is parameterized as a latitude strip over which the buoyancy flux is negative. The results sugge…
doi = 10.1175/JCLI-D-18-0519.1
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