…About 94% of the total amount of water near the Earth's surface is held in the oceans as seawater. Earth is the only planet in the solar system that has oceans that contain seawater. The total volume of seawater is about 1350×10 6 km 3 , and the annual evaporation rate is about 450×10 3 km 3 , so the time required for all the ocean water to disappear through evaporation, that is, the average time that water remains in the oceans, is about 3000 years. Since the amount of water that evaporates is replenished by rainfall, inflow from rivers, and melting ice from the Arctic and Antarctic Oceans, there is actually no noticeable sudden change in the amount of seawater. … *Some of the terminology that refers to "Eckert's experimental formula" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…地表近くにある水の総量のうち,約94%が海水として海にたたえられている。太陽系の惑星の中で,海水をたたえた海が存在するのは地球だけである。海水の全体積は1350×106km3程度,1年間の蒸発量は450×103km3程度であるから,全海洋水が蒸発によってなくなってしまうのに必要な時間,すなわち水が海洋中に滞留する平均時間は3000年程度である。水の蒸発量に見合う量の水が,降雨,河川からの流入,北氷洋や南氷洋からの氷のとけこみによって補われているため,海水の量には実際上,目立った急な変化は起こらない。… ※「エッカートの実験公式」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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