By mixing, we've actually increased the potential energy of the system.
Some of the salt that was originally in the lower two thirds
has been raised to occupy part of the upper part of the glass.
These mixing places are actually very inefficient,
typically only about 3% of the energy put in
by the storm actually increases the potential energy of the water column.
Most is dissipated to heat via turbulent processes or
carried away by those internal waves that I mentioned.
>> Well thanks, Gregory.
So, to summarize this lecture, we learned that the oceans are an important
contributor to moving the excess energy received from the sun poleward.
We've also seen the variability in temperature,
salinity in the ocean currents that exist around the world.
We also have seen a dramatic illustration of how the thermocline forms and
how it separates warm, less salty water from the surface, from deeper,
colder and more saline water below.
Finally, Gregory showed us a dramatic illustration of how storms
can lead to mixing in the surface layer, deepening this layer and
increasing the depth of the thermocline.
In the next lecture, we'll see more on how these characteristics
of the ocean change on longtime scales.