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Recent observations and modelling studies have demonstrated the potential for\udrapid and substantial retreat of large sectors of the East Antarctic Ice\udSheet (EAIS). This has major implications for ocean circulation and global\udsea level. Here we examine the effects of increasing meltwater from the\udWilkes Basin, one of the major marine-based sectors of the EAIS, on Southern\udOcean dynamics. Climate model simulations reveal that the meltwater flux\udrapidly stratifies surface waters, leading to a dramatic decrease in the rate\udof Antarctic Bottom Water (AABW) formation. The surface ocean cools but,\udcritically, the Southern Ocean warms by more than 1 °C at\uddepth. This warming is accompanied by a Southern Ocean-wide “domino\udeffect”, whereby the warming signal propagates westward with depth. Our\udresults suggest that melting of one sector of the EAIS could result in\udaccelerated warming across other sectors, including the Weddell Sea sector of\udthe West Antarctic Ice Sheet. Thus, localised melting of the EAIS could\udpotentially destabilise the wider Antarctic Ice Sheet

Impacts of marine instability across the East Antarctic Ice Sheet on Southern Ocean dynamics