Abyssal circulation driven by near-boundary mixing: water mass transformations and interior stratification

dc.contributor.author Drake, Henri F.
dc.contributor.author Ferrari, Raffaele
dc.contributor.author Callies, Joern
dc.date.accessioned 2021-02-17T15:07:12Z
dc.date.available 2021-02-17T15:07:12Z
dc.date.issued 2020-07-24
dc.description Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(8),(2020): 2203-2226, doi:10.1175/JPO-D-19-0313.1. en_US
dc.description.abstract The emerging view of the abyssal circulation is that it is associated with bottom-enhanced mixing, which results in downwelling in the stratified ocean interior and upwelling in a bottom boundary layer along the insulating and sloping seafloor. In the limit of slowly varying vertical stratification and topography, however, boundary layer theory predicts that these upslope and downslope flows largely compensate, such that net water mass transformations along the slope are vanishingly small. Using a planetary geostrophic circulation model that resolves both the boundary layer dynamics and the large-scale overturning in an idealized basin with bottom-enhanced mixing along a midocean ridge, we show that vertical variations in stratification become sufficiently large at equilibrium to reduce the degree of compensation along the midocean ridge flanks. The resulting large net transformations are similar to estimates for the abyssal ocean and span the vertical extent of the ridge. These results suggest that boundary flows generated by mixing play a crucial role in setting the global ocean stratification and overturning circulation, requiring a revision of abyssal ocean theories. en_US
dc.description.sponsorship We acknowledge funding support from National Science Foundation Awards 6932401 and 6936732. en_US
dc.identifier.citation Drake, H. F., Ferrari, R., & Callies, J. (2020). Abyssal circulation driven by near-boundary mixing: water mass transformations and interior stratification. Journal of Physical Oceanography, 50(8), 2203-2226. en_US
dc.identifier.doi 10.1175/JPO-D-19-0313.1
dc.identifier.uri https://hdl.handle.net/1912/26687
dc.publisher American Meteorological Society en_US
dc.relation.uri https://doi.org/10.1175/JPO-D-19-0313.1
dc.subject Abyssal circulation en_US
dc.subject Bottom currents en_US
dc.subject Boundary currents en_US
dc.subject Mixing en_US
dc.subject Bottom currents/bottom water en_US
dc.subject Boundary layer en_US
dc.title Abyssal circulation driven by near-boundary mixing: water mass transformations and interior stratification en_US
dc.type Article en_US
dspace.entity.type Publication
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relation.isAuthorOfPublication.latestForDiscovery 2f0fae06-1638-4f92-8748-77e269a3f231
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