含盐量很高的海水,一般气温下不易结冰,因为海水的结冰点低于淡水。当冬季气温过低时,海水会排析出盐分而结冰。北冰洋是四季冰封的海洋,太平洋北部的白令海、鄂霍茨克海、日本海、太西洋北部的格陵兰海、挪威海、北海和加拿大沿海等海域,冬季都有海冰生成。我国渤海和黄海北部 Saltwater with high salt content is not easy to freeze under normal temperatures because the freezing point of seawater is lower than that of fresh water. When the winter temperature is too low, the sea water will be discharged out of salt and frozen. The Arctic Ocean is characterized by four seasons of frozen sea ice in the winter, including the Bering Sea, the Okhotsk Sea, the Sea of ​​Japan, the Greenland Sea in the northern part of the Pacific Ocean, the Norwegian Sea, the North Sea and the coastal areas of Canada. China's Bohai Sea and northern Yellow Sea