Chilla said...Call me daft

but why is the water in the ocean warmer then the water in the lakes? I'm guessing it's something to do with turbulence maybe?
I think its to do with the laws of thermodynamics and heat exchange. I'm no physicist however it makes sense that a small body of water would be influenced more by its nearby environment than a large body of water. It takes much longer to boil two litres of water in a jug than 200 ml. It takes a lot longer to freeze a two litre bottle of water in a freezer than a icecube.
The ocean would have a huge amount of thermal mass as its so big so it would take a lot of climatic influence for it to change temperature. A much smaller and shallower lake would have a much smaller thermal mass and be influenced by its environment much more.
Plus all the currents flowing around the ocean so warm tropical water would be flowing around even in the middle of winter.
So there would be a bunch of reasons why the ocean is warmer in winter. Also the converse in summer is true with the lakes being warmer than the ocean in summer. This could probably be proved by a bunch of complex formula that no one besides a select few understand.