Abstract
This paper investigates the dynamics of the Antarctic Bottom Water (AABW) e ow through the RomancheFractureZone(RFZ)inaprimitiveequationmodelwithahighhorizontalandverticalresolution. Two examples of e ows over simple bathymetries show that a reduced gravity model captures the essential dynamics ofthe primitiveequationmodel.Thereduced gravity model is then used asa toolto identify what arethe bathymetricstructures(sills,narrows)thatmostlyconstraintheAABWe owthrough the RFZ.When only these structures are represented in the primitive equation model, the AABW e ow is shown to be coherentwithobservations(transports,densityand velocitystructures).
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