The upwell ing brings the thermocline—the boundary layer between deep, cold water and the warm water of the surface—up as high as 30 feet from the top.
Plankton need nutrients, but most nutrients are locked in the deep, denied access to the surface by a layer of water called the thermocline, around 200 metres down.
得局部温越层(深
的冰
海水和表面的温暖海水
2016
5月合集
份，这样的温跃层就将不复存在。
太平洋》
海，因为水下约200
