The Antarctic Circumpolar Current (ACC), the oceanic current that flows around the Antarctic continent, has many links to weather and climate processes (e.g., http://earthscience.stackexchange.com/questions/3201/is-there-conclusive-evidence-for-the-antarctic-circumpolar-current-developing-af).
My question is how has the total transport of the current changed in time at different time scales? Clearly, it has changed since its potential formation in the late Miocene. My interest is in both short time scales (seasonal), decadal (e.g., ENSO effects) and longer time scales.