调查分析和大洋模式表明，中生代－新生代温暖气候条件下的大洋环流型式与现代明显不同。白垩纪无冰期可能是最有争议的时期。经向大洋热传递可以解释高纬度表层海水温度较高的原因，南北半球高纬度表层海水温度保持在10～15 ℃左右导致大洋热量由赤道向两极对称传递。有迹象表 The investigation and analysis and the oceanic model show that the circulation patterns of the oceanic circulation under Mesozoic-Cenozoic warm climates are obviously different from the modern ones. Cretaceous ice-free period may be the most controversial period. The heat transfer to the ocean can explain the high temperature of the surface seawater in high latitudes. The surface seawater temperature in the high latitudes of the northern and southern hemispheres is kept at about 10-15 ° C, resulting in the symmetrical transfer of oceanic heat from the equator to the poles. There are signs