Sea ice

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  • Sea Ice
definition
  • Pertaining to the study of frozen seawater over the ocean surface. 
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Abstract from DBPedia
    Sea ice arises as seawater freezes. Because ice is less dense than water, it floats on the ocean's surface (as does fresh water ice, which has an even lower density). Sea ice covers about 7% of the Earth’s surface and about 12% of the world’s oceans. Much of the world's sea ice is enclosed within the polar ice packs in the Earth's polar regions: the Arctic ice pack of the Arctic Ocean and the Antarctic ice pack of the Southern Ocean. Polar packs undergo a significant yearly cycling in surface extent, a natural process upon which depends the Arctic ecology, including the ocean's ecosystems. Due to the action of winds, currents and temperature fluctuations, sea ice is very dynamic, leading to a wide variety of ice types and features. Sea ice may be contrasted with icebergs, which are chunks of ice shelves or glaciers that calve into the ocean. Depending on location, sea ice expanses may also incorporate icebergs.

    海氷(かいひょう、英: sea ice)とは海水が凍結したものである。海水は塩分を含むため氷点は-1.8℃ほどである。定着氷(fast ice)は海氷が沿岸にそって凍り沖へ広がったもので、流氷(pack ice)とは、凍結・密集し岸から離れて漂流する海氷、もしくはそれらが岸へ漂着したものを言う。氷盤(ice floe)とは、浮かんでいる海氷の塊で最大径が10 kmより小さいものを指し、それより大きな氷盤は氷原(ice field)と呼ばれる。 海氷は、棚氷や氷河が分離した塊の氷山と混同されることがあるが、それとは異なるものである。 

    (Source: http://dbpedia.org/resource/Sea_ice)

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