WHOI PO

Antarctic Bottom Water temperature changes in the Argentine Basin are quantified using historical shipboard CTD data and recently collected CTD data from eleven Deep Argo floats deployed in the basin. Deep Argo data provide a much more certain, and up-to-date, estimate of the deep warming trend of 2 m°C/yr than afforded by repeat hydrographic section data alone. They also reveal a spatial pattern in the warming suggesting a slowdown of the flow of Antarctic Bottom Water into the basin consistent with the overall warming trend in the bottom waters there. The remarkable Zapiola Gyre within the basin is also revisited, including new transport estimates, discussion of bottom intensification, illustration of the gyre with water property maps on a deep isopycnal, and analyses of both Deep and Core Argo float trajectories around the gyre.