Global glaciations have varied in size and magnitude since the Early–Middle Pleistocene transition (~773 ka), despite the apparent regular and high-amplitude 100 ka pacing of glacial–interglacial cycles recorded in marine isotope records. The evidence on land indicates that patterns of glaciation varied dramatically between different glacial–interglacial cycles. For example, Marine Isotope Stages (MIS) 8, 10, and 14 are all noticeably absent from many terrestrial glacial records in North America and Europe. However, globally, the patterns are more complicated, with major glaciations recorded in MIS 8 in Asia and in parts of the Southern Hemisphere, such as Patagonia, for example. This spatial variability in glaciation between glacial–interglacial cycles is likely to be driven by ice volume changes in the West Antarctic Ice Sheet and associated interhemispheric connections through ocean–atmosphere circulatory changes. The weak global glacial imprint in some glacial–interglacial cycles is related to the pattern of global ice buildup. This is caused by feedback mechanisms within glacial systems themselves that partly result from long-term orbital changes driven by eccentricity.

中文翻译：

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中更新世的“消失的冰川”

尽管在海洋同位素记录中记录了明显的规则和高振幅 100 ka 的冰期 - 间冰期循环，但自早中更新世过渡（约 773 ka）以来，全球冰川的规模和幅度有所不同。陆地上的证据表明，不同的冰期 - 间冰期周期之间的冰川作用模式差异很大。例如，北美和欧洲的许多陆地冰川记录中都明显缺少海洋同位素阶段 (MIS) 8、10 和 14。然而，在全球范围内，模式更为复杂，主要冰川记录在亚洲的 MIS 8 和南半球的部分地区，例如巴塔哥尼亚。冰期 - 间冰期循环之间冰川作用的这种空间变化可能是由南极西部冰盖中的冰量变化以及通过海洋 - 大气循环变化相关的半球间连接驱动的。一些冰期-间冰期循环中较弱的全球冰川印记与全球冰层堆积的模式有关。这是由冰川系统本身内部的反馈机制引起的，部分原因是由偏心率驱动的长期轨道变化。