EAS212 Lecture 16: Sea Ice

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The amount of sea ice in the arctic is strongly shrinking. Sea ice changes over the last 30 years: The surface cools to 0c then freezes: more cooling = ice thickens ice is a good insulator though so it thickens slowly therefore i(cid:374) a deep lake, the deeper parts (cid:449)o(cid:374)"t freeze. In the ocean, density increases until the freezing point is reached at ~-1. 8c, therefore cooling water continues to sink when it is formed. A later stage of freezing when the crystals have coagulated to make a soupy layer on the surface. Reflects little light = a matte appearance on the surface. A(cid:272)ts like a fluid, does(cid:374)"t for(cid:373) disti(cid:374)(cid:272)t i(cid:272)e floes: pancake ice: Circular pieces of ice from 30 cm 3 m in diameter, and up to 10 cm in thickness. Has raised rims because of pieces striking one another: sea-ice growth:

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