The majority of Antarctic Circumpolar Current water is transported by jets in the Sub-Antarctic Front and the Polar Front. (journals.plos.org)
Scientists have observed that pressure from current - seafloor encounters drives the direction of the massive Antarctic Circumpolar Current in the Southern Ocean. (eos.org)
In this case, incursions of circumpolar deep water onto the continental shelf are melting the ice stream at its base and encouraging grounding line recession, which results in a positive feedback loop and further grounding line recession. (antarcticglaciers.org)