Abstract The respective impacts of Northern and Southern Hemispheric climatic changes on the Tropics during the last deglaciation remain poorly understood. In the High Tropical Andes, the Antarctic Cold Reversal (ACR, 14.3–12.9 ka BP) is better represented among morainic records than the Younger Dryas (12.9–11.7 ka BP). However, in the Altiplano basin (Bolivia), two cold periods of the Northern Hemisphere (Heinrich Stadial 1a, 16.5–14.5 ka BP, and the Younger Dryas) are synchronous with (i) major advances or standstills of paleoglaciers and (ii) the highstands of giant paleolakes Tauca and Coipasa. Here, we present new cosmic ray exposure (CRE) ages from glacial landforms of the Bolivian Andes that formed during the last deglaciation (Termination 1). We reconstruct the equilibrium line altitudes (ELA) associated with each moraine and use them in an inverse algorithm combining paleoglaciers and paleolake budgets to derive temperature and precipitation during the last deglaciation. Our temperature reconstruction (ΔT relative to present day) yields a consistent regional trend of progressive warming from ΔT = −5 to −2.5 °C during 17–14.5 ka BP, followed by a return to colder conditions around −4 °C during the ACR (14.5–12.9 ka BP). The Coipasa highstand (12.9–11.8 ka BP) is coeval with another warming trend followed by ΔT stabilization at the onset of the Holocene (ca. 10 ka BP), around −3 °C. Our results suggest that, during the last deglaciation (20–10 ka BP) atmospheric temperatures in the Tropical Andes mimicked Antarctic variability, whereas precipitation over the Altiplano was driven by changes in the Northern Hemisphere.

中文翻译：

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上次冰消期冰川和湖泊记录的热带安第斯山脉类似南极的温度变化

摘要 上次冰消期北半球和南半球气候变化对热带的各自影响仍知之甚少。在高热带安第斯山脉，南极冷逆转（ACR，14.3-12.9 ka BP）在冰碛记录中比年轻的仙女木（12.9-11.7 ka BP）更能体现。然而，在 Altiplano 盆地（玻利维亚），北半球的两个寒冷时期（Heinrich Stadial 1a，16.5-14.5 ka BP 和 Younger Dryas）与 (i) 古冰川的主要进展或停滞以及 (ii)巨大的古湖泊陶卡和科伊帕萨的高地。在这里，我们展示了上次冰消期（终止 1）期间形成的玻利维亚安第斯山脉冰川地貌的新宇宙射线暴露 (CRE) 年龄。我们重建与每个冰碛相关的平衡线高度 (ELA)，并在结合古冰川和古湖泊预算的逆算法中使用它们，以推导出最后一次冰消期间的温度和降水。我们的温度重建（相对于今天的 ΔT）产生了一致的区域趋势，即在 17-14.5 ka BP 期间从 ΔT = -5 到 -2.5 °C 逐渐变暖，然后在 ACR 期间返回到 -4 °C 左右的较冷条件(14.5–12.9 ka BP)。Coipasa 高位（12.9-11.8 ka BP）与另一个变暖趋势同时存在，随后是全新世开始时的 ΔT 稳定（约 10 ka BP），大约 -3 °C。我们的结果表明，在最后一次冰消期（20-10 ka BP）期间，热带安第斯山脉的大气温度模拟了南极的变化，