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Arctic ice pack
The Arctic ice pack is the ice cover of the Arctic Ocean and its vicinity. The Arctic ice pack undergoes a regular seasonal cycle in which ice melts in spring and summer, reaches a minimum around mid-September, then increases during fall and winter. Summer ice cover in the Arctic is about 50% of winter cover.〔(Polar Sea Ice Cap and Snow – Cryosphere Today ), University of Illinois〕 Some of the ice survives from one year to the next. Currently 28% of Arctic basin sea ice is multi-year ice,〔(Arctic Sea Ice News & Analysis – April 2008 )〕 thicker than seasonal ice: up to thick over large areas, with ridges up to thick. As well as the regular seasonal cycle there has been an underlying trend of declining sea ice in the Arctic in recent decades.
==Climatic importance==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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