The dominant pacing of glacial‐interglacial cycles in deep‐ocean δ¹⁸O records changed substantially during the Mid‐Pleistocene Transition. The precessional cycle (∼23 ky) is absent during the Early Pleistocene, which we show can be explained by cancellation of the hemispherically antiphased precessional cycle in the Early Pleistocene interior ocean. Such cancellation develops due to mixing of North Atlantic and Southern Ocean δ¹⁸O signals at depth, and shows characteristic spatial patterns. We explore the cancellation potential for different North Atlantic and Southern Ocean deep‐water source δ¹⁸O values using a tracer transport ocean model. Cancellation of precession occurs for all signal strengths and is widespread for a signal strength typical for the Early Pleistocene. Early Pleistocene precessional power is therefore likely incompletely archived in deep‐sea δ¹⁸O records, concealing the true periodicity of the glacial cycles in the two hemispheres.

中文翻译：

---

早更新世期间δ18O记录的旋进周期的消除。

在深海冰-间周期的主导起搏δ ^18个ö记录中更新世过渡期间基本上改变。早更新世期间没有进动旋回（〜23 ky），这可以通过取消早更新世内部海洋中的半球形反相进动旋回来解释。这样消除开发由于北大西洋和南大洋的混合δ ^18个在深度O信号和节目特征空间模式。我们探索不同北大西洋和南大洋取消潜在的深水源δ ¹⁸使用示踪物运输海洋模型的O值。所有信号强度都会发生进动的抵消，而对于更新世早期的典型信号强度而言，抵消已很普遍。早更新世岁差功率因此有可能不完全在深海封存δ ^18条Ø记录，隐藏在两个半球的冰川周期的真正周期性。