I have now at least found one australian buoy in Antarctica with at least 5 years observancy:

Jan 12, 2011:
![12012011](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/profile_4.gif)

Jan 19, 2012:
![19012012](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/profile_42.gif)

Jan 16, 2013:
![16012013](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/profile_79.gif)

Jan 13, 2014
![13012014](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/profile_116.gif)

Jan 20, 2015
![20012015](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/profile_154.gif)

I don't know those buoys are drifting around, but almost 1 degree celsius higher maximal temperature within a few years, appears to me to be quite a lot.

![float position](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/loc_7900316.gif)

I would also like to point out that this buoy has a history of temperatures/depth diagram, which are however colour coded and thus
the temperature fluctuations are not that well visible:

![colour](http://www.marine.csiro.au/~gronell/ArgoRT/floats/7900316/T_7900316.gif)