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Frozen sea

Duration: 00:59

When the sea around Antarctica drops to minus 1.9 degrees centigrade, it begins to freeze. A slight swell on the surface produces pancake ice - vaguely circular or square slabs of ice with raised edges. In the frigid air, the ice above the waterline grows into crystals. The early explorers called these fantastic shapes ice flowers. As it gets colder, the ice thickens and at the coast it freezes fast to the margins of the land. Farther out the pack ice consolidates into vast plains of sea ice.

Available since: Tue 4 Oct 2011

This clip is from

Life In The Freezer The Door Closes

4/6 Autumn stirs harsh seas which batter Antarctica, leaving penguins to struggling to feed.

First broadcast: 25 Jul 2007

Image for The Door Closes Not currently available on BBC iPlayer

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