LLN 2-D模式模拟的纬带平均海温谱数据集（过去200 ka）

冰期和间冰期交替循环是第四纪古气候变化的基本特征。大洋底部沉积物中的有孔虫δ18O记录表明了这种循环具有约100 ka，41 ka和23 ka等几个主要周期成分，它们均位于Milankovitch频率带上。用δ18O记录恢复的海温谱不仅随纬度变化，而且冷季与暖季之间存在着明显的差别。用一个由海、冰、气耦合的二维古气候模式模拟出了δ18O海温谱的主要特征，在一定程度上检验了Milankovitch的天文古气候学说。模式在没有地形的条件下能成功地模拟出100 ka周期成分，一方面说明青藏高原的隆起并不是100 ka古气候振荡出现的充分条件；另一方面表明它很可能是海-冰-气气候子系统之间相互作用的产物。

The alternating cycles of glacial and interglacial periods are the fundamental characteristics of Quaternary paleoclimatic changes. The δ¹⁸O records of foraminifera in deep-sea sediments indicate that these cycles have several dominant periodic components, including ~100 ka, 41 ka and 23 ka, all of which fall within the Milankovitch frequency band. Sea temperature spectra reconstructed from δ¹⁸O records vary not only with latitude, but also show significant differences between cold and warm seasons. A two-dimensional ocean-ice-atmosphere coupled paleoclimate model was used to simulate the key characteristics of the δ¹⁸O-derived sea temperature spectrum, which to a certain extent validates Milankovitch's astronomical paleoclimate theory. The model successfully simulates the 100 ka periodic component even in the absence of topography, which on one hand indicates that the uplift of the Tibetan Plateau is not a sufficient condition for the occurrence of the 100 ka paleoclimatic oscillation; on the other hand, it suggests that this periodicity is likely a product of interactions between ocean-ice-atmosphere climate subsystems.