Transport of Antarctic Bottom Water Entering the Brazil Basin in a Planetary Geostrophic Inverse Model

The abyssal circulation in the interior portions of Brazil Basin and northern Argentine were estimated using an overdetermined inverse method conserving neutral surface planetary potential vorticity salinity. Antarctic Bottom Water (AABW) flows with a northward component through 30°S west Rio Grande Rise (RGR), as expected. However, area east RGR, model shows southward transport upper part AABW across 30°S. This finding suggests that previous calculations Hunter Channel reaching broader may be overestimates. Reduced has significant implications for heat budget, implying less diapycnal mixing warmer classes, compared to earlier studies.