摘要：the Southern Ocean surrounding antarctica is a region that is key to a range of climatic and oceanographic processes with worldwide efects, and is characterised by high biological productivity and biodiversity. Since 2013, the International Bathymetric Chart of the Southern Ocean (IBCSO) has represented the most comprehensive compilation of bathymetry for the Southern Ocean south of 60°S . Recently, the IBCSO Project has combined its eforts with the Nippon Foundation – GEBCO Seabed 2030 Project supporting the goal of mapping the world’s oceans by 2030. New datasets initiated a second version of IBCSO (IBCSO v2) . This version extends to 50°S (covering approximately 2.4 times the area of seafoor of the previous version) including the gateways of the Antarctic Circumpolar Current and the Antarctic circumpolar frontal systems . Due to increased (multibeam) data coverage, IBCSO v2 signifcantly improves the overall representation of the Southern Ocean seafoor and resolves many submarine landforms in more detail . This makes IBCSO v2 the most authoritative seafoor map of the area south of 50°S .
