Aye that is a strange piece of work to be sure.
What's the thermoclime then?
Hmm... isn't google great.
Posted By: John Christie, Faculty, School of Chemistry, La Trobe University, Bundoora, Victoria, Australia
'Most things expand, or get a little bigger, when they get warmer, and
contract, or get a little smaller when they get cooler. But water is very
special and unusual stuff. If you cool water down, it contracts until it
gets to 4 deg C (or 39 deg F), and then it starts to expand again. And, of
course it expands a lot at 0 deg C (or 32 deg F) when it turns to ice. That
is why ice floats on water. But it also means that freezing cold water at
about 33 deg F will rise to the top of very cold water at about 39 deg F.
But warm water at 70 deg F will float on top of cool water at 60 deg F.
So suppose that you have a lake in the summertime. All the warmer water
will be at the top and the cooler water will be at the bottom. When it
starts to cool down as winter comes on, it will stay that way till the
water gets really cold. Then the coldest water, which is freezing cold,
will be lighter than the not so cold water, and will want to come to the
top. So the whole lake will need to turn itself upside down!'
Cheers Prof John.