Supplementary material from "Buoyancy forcing and the subpolar Atlantic meridional overturning circulation" ...

• Main Authors: Buckley, Martha W., Susan Lozier, M., Desbruyéres, Damien, Gwyn Evans, Dafydd
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: The Royal Society 2023
• Subjects: Oceanography; FOS Earth and related environmental sciences; Labrador Sea; Nordic Seas; North Atlantic
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.6823321.v1; https://rs.figshare.com/collections/Supplementary_material_from_Buoyancy_forcing_and_the_subpolar_Atlantic_meridional_overturning_circulation_/6823321/1

The North Atlantic meridional overturning circulation and its variability are examined in terms of the overturning in density space and diapycnal water mass transformation. The magnitude of the mean overturning is similar to the surface water mass transformation, but the density and properties of these waters are modified by diapycnal mixing. Surface waters are progressively densified while circulating cyclonically around the subpolar gyre, with the densest waters and deepest convection occurring in the Labrador Sea and Nordic Seas. The eddy-driven interaction between the convective interior and boundary currents is a key to the export of dense waters from marginal seas. Due to the multitude of pathways of dense waters within the subpolar gyre, as well as mixing with older waters, waters exiting the subpolar gyre have a wide range of ages, with a mean age on the order of a decade. As a result, interannual changes in water mass transformation are mostly balanced locally and do not result in changes in export ...