A01-1

A01-1 Circulation dynamics of heat, freshwater, and material originating from Antarctic Bottom Water
The Role
Targeting East Antarctica that has been a missing piece of abyssal circulation, we will quantify the formation, circulation, and variation of the Antarctic Bottom Water and the accompanying material cycles, including the influence of the melting ice shelves, based on in-situ observations.  We will also evaluate the role of the interaction between the bottom water and ice sheets on the global heat, water, and material circulations.
Research overview
Focusing on the Amery Ice Shelf area, we will quantify the formation, circulation, and variability of bottom water, including the influence of the melting ice shelves, in terms of several chemical tracers such as CFCs, SF6, δ18O, and mooring observations.
We will estimate the nutrient circulation and the CO2 uptake rate stemming from the bottom water through the measurements of total carbonate etc..
Further, we will evaluate their influence on climate and ecosystems, in collaboration with the ecosystem group.
We will observe the process for high production of sea ice and dense water, and material cycles in the Cape Darnley polynya, where dense water and materials sink, by introducing the mooring of the automatic water samplers and profiling floats.
Targeting Amery Ice Shelf and Shirase Glacier, we will clarify the elementary processes of the interaction among the sea ice, ocean, and glaciers, using underwater robots and bio-logging technologies, in collaboration with the exploration group and the ice-sheet group.