Walk Around "The Point"
What's the point? the point is Rothera Point, as referenced in the name of this blog, and it takes about 45 minutes to walk right round the coast. I sometimes go round in lunch hour and today went for a closer look at the forming sea-ice. It's coming along OK, but it's frustratingly tenuous, since the first decent bit of wind from the north (prevailing direction) will blow it all out. It's been calm and cold for about a week now, so most of the sea is covered in some form of ice. Simply put, the sea surface kind of freezes into tiny little plate shaped ice crystals a few millimetres across, called frazil ice, and once there are lots of these the surface goes a bit slushy (grease ice). Wind and currents then turn the grease into roughly round "panckaes" of ice which then bash into to each other and give the characteristic upturned edges, a bit like giant water lillies that you might have seen in the hothouse of a botanic garden. Eventually the pancakes raft over each other and freeze, or they freeze together side by side, thicken from the bottom, and eventually you can drive vehicles on it... Fingers crossed. But the wind has the potential to ruin everything in a short time.
A Weddell seal, the nicest looking and friendliest of all the sea-mammals around here. Docile and quite happy to have their picture taken.
A pic taken this morning when the almost-full moon was making some dramatic lighting effects on the low stratus.
A photo taken by Matt of some beautiful nacreous clouds we saw a couple of weeks ago - these are stratospheric clouds, very high, and form when the temperatures up there get below -82 degrees C. They are rare, stunning, and very important in the study of ozone depletion events which affect the ozone hole. This is because the surfaces of these clouds provide perfect venues for chemical reactions to occur which destroy ozone. Our weather balloons get info about the level of the stratosphere and the temperatures up there for the Brains in Cambridge to analyze. My boss in Cambridge is Jon Shanklin - one of 3 guys that discovered the ozone hole in the first place and is still studying it.




