When a strong wind blows from land to sea, surface water is carried offshore, and the bottom water, which has become extremely depleted of oxygen, rises up near land to replenish it. The sea surface turns a cloudy blue or green, and large numbers of fish and shellfish die from lack of oxygen. Blue tides in Tokyo Bay have been reported since around 1963, and they occur frequently in the northeastern part of the bay from summer to early autumn, becoming a major social problem. The mechanism of occurrence is qualitatively quite clear, but little is known quantitatively. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
陸から海へ強い風が吹くと表層水が沖へ運ばれ,酸素が極端に少なくなった底層水が,これを補う形で陸地付近にわきあがることにより引き起こされる現象。海面が白濁した青または緑に変色し,魚介類を大量に酸欠死させる。東京湾における青潮は,1963年ごろより発生が報告されており,湾北東部で夏から初秋にかけて頻発し大きな社会問題となっている。発生機構は,定性的にはかなり明らかであるが,定量的にはほとんど解明されていない。
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