Seasonal thermocline

Japanese: 季節躍層 - きせつやくそう（英語表記）seasonal thermocline

From late spring to summer, when heating through the ocean surface is significant, a layer with a large vertical gradient of water temperature appears in the surface mixed layer and gradually develops; this thermocline is called the seasonal thermocline. From autumn, when the ocean surface begins to cool, a new mixed layer appears near the ocean surface and develops due to mixing caused by convection, wind, and waves; the seasonal thermocline also increases in depth accordingly, and is absorbed into the main thermocline during the harsh winter. (Nagata)

Source: Japan Hydrographic Association, Ocean Information Research Center, Encyclopedia of the Sea

Japanese:

海面を通しての加熱が著しい晩春から夏期にかけて、表層混合層の中に水温の鉛直勾配が大きな層が生じ次第に発達していくが、この水温躍層を季節躍層という。海面の冷却が始まる秋期から、海面近くに新たな混合層が生じ、対流や風・波による混合作用によって発達していくが、これに応じて季節躍層の深さも増大してゆき、厳冬期には主水温躍層に吸収される。（永田）

出典　(財)日本水路協会海洋情報研究センター海の事典について　情報

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