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南沙海区属于西太平洋暖池区，其盛冰期的表层水温变化涉及暖池在冰期旋回中的稳定性，因而具有全球性意义、本文根据十几个沉积柱状样的氧同位素与微体古生物分析结果，指出南沙海区盛冰期时夏季温度与全新世差别微小，而冬季水温强烈降低，使季节性温差高达６℃，明显超过同纬度的西太平洋开放水域。推测冰期时的冬季风强化，是造成这些变化的主要原因，同时也为热带海区冰期海面温度高、岛屿山地温度低的矛盾提出了一种新的可能解释。
The Nansha sea area belongs to the western Pacific warm pool area. The change of surface water temperature during the glaciation period is related to the stability of the warm pool in the glacial cycle. Therefore, it has global significance. According to the results of a dozen sedimentary columnar oxygen isotopes and paleontological analysis It is pointed out that during the ice age of Nansha sea area, the summer temperature is slightly different from that of the Holocene, while the winter water temperature drops strongly, bringing the seasonal temperature difference up to 6 ℃, obviously exceeding the open water area of the western Pacific at the same latitude. It is speculated that the enhancement of winter monsoon during the glacial period is the main reason for these changes. At the same time, a new possible explanation is given for the contradiction between the sea surface temperature in the glacial sea in the tropical sea area and the low mountainous island temperatures.