一、海洋深层水的定义从海洋学的理论上讲,在大陆架外部海域的补偿深度(即海洋植物发生光合作用的极限深度,一般被认为以200米为其极限值)以下,便可称之为“海洋深层”(无光层)。反之,浅于200米以上的海水则称之为“海洋表层”(有光层)。全世界海洋的平均水深为3800米,从海洋学理论广义上讲,地球上的海水有95％为海洋深层的海水。由于有光层与无光层并没有一个明显的界限,实际上在 First, the definition of deep ocean water From the perspective of oceanography, the depth of compensation outside the continental shelf (ie, the ultimate depth of photosynthesis of marine plants, generally considered to be 200 meters as its limit) below, can be called For the “deep ocean” (dark layer). Conversely, seawater shallower than 200 meters is called the “ocean surface” (light layer). The average depth of the world’s oceans is 3,800 meters. From the oceanographic theory, the sea water on Earth is 95% deep sea water. Since there is no obvious boundary between the light layer and the lightless layer, actually