Southern Ocean Mixed-LayEr interannual variability and BarOtropic DYnamics from ocean surface topography and gravimeter data (SOMeBoDY)
The way the Southern Ocean currents respond to climate variability may also ultimately affect water mass transformation, as this process occurs in localized injection windows along the Antarctic Circumpolar Current (ACC) pathway. There is thus great interest to investigate the dynamical response of the ocean jointly with upper ocean thermodynamics. We will focus on the Kerguelen region as a test case, where we benefit from a 20-year long time series of transport derived from altimetry, of the branch of the ACC crossing the Kerguelen Plateau. The dynamical response of the current will be analyzed from a recent long barotropic simulation and GRACE data. ML temperature and salinity budgets will be investigated at the scale of the entire ice-free Southern Ocean from a relatively simple model relying on altimeter data, atmospheric forcings, and hydrographic observations.