Add example: Water masses, seasonal termocline, and geostropy

As part of adapting the AoS to be used in teaching oceanography, it would interesting to add examples of:

- Identify main Water masses using Argo floats. Using a TS diagram. Diferentes basins and water masses.

- Visualice the seasonal thermocline. For instance in floats that hace spent a lot of time in the water (for instance https://www.argoespana.es/float/3901236.html)

- Explain Geostrophy using, for instance, floats a each side of the Gulf Stream, computing the velocity acros the flow and its time evolution. It can be done in the Kuroshio.

- Upwelling?

- Western boundary current intesification

- Slope currents (Polwerd)

- Artic? -