2:17 PM - 2:39 PM
[U21-01] Oceanographic and geophysical observation campaign off Sabrina Coast, East Antarctica, in 2019/2020
Keywords:Totten Glacier, Japanese Antarctic Research Expedition, Modified Circumpolar Deep Water, Sealevel rise
Based on Icebreaker Shirase, we conducted oceanographic and geophysical observations off Sabrina Coast, East Antarctica, during Dec. 2019 and Feb.-Mar. 2020 as a program of 61st Japanese Antarctic Research Expedition (JARE61). Hydrographic measurements, including CTD (Conductivity-Temperature Depth profiler)/MS (Multi-water Sampler) and XCTD (eXpendable CTD), revealed the ubiquitous presence of deep warm water in this region, which is the source of the large thermal forcing. Air-borne XCTD and XBT(eXpendable BathyThermograph) helped enhance the spatial sampling in difficult access area, and largely expand the distribution of water mass property. At the same time, sediments and their cores were taken for the first time in this region. Bathymetric survey with multi-narrow beam was effective and describes new and detailed topographic features in the least explored area. Sea ice research including wave motion measurements were conducted at the marginal ice zone off Dolton Polynya. International cooperation was effective in filling gaps of our observational systems. Further analysis of these data enables us to decipher a detailed pathway of warm water and meltwater discharge to and from the Totten Glacier Ice Shelf and its historical evolution.