Global thermolhaline circulation, which is responsible for the transport of heat from the equator to the poles. The major formation regions of deep and bottom water are the Nordic Seas, the Weddell and the Ross Seas. The Eirik Drift south of Greenland and the Argentine continental margin (red circles) form ideals location to study modifications in strength and pathway of the Western Boundary Undercurrent, here mainly built up by North Atlantic Deepwater NADW.