Dataset from : "Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lakes during the last deglaciation" (Martin et al., 2020 - QSR)

Datasets presented in the Quaternary Science Reviews article "Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lakes during the last deglaciation" (Martin et al., 2020; 10.1016/j.quascirev.2020.106542).

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.

本数据集源自发表于《第四纪科学评论（Quaternary Science Reviews）》的论文《末次冰消期冰川与湖泊记录的热带安第斯山脉类南极温度变化》（Martin等，2020；DOI: 10.1016/j.quascirev.2020.106542）。

摘要：
末次冰消期期间，南北半球气候变化对热带地区的各自影响仍未得到充分认知。在热带安第斯高山区，南极冷回返事件（Antarctic Cold Reversal, ACR，14.3~12.9 ka BP）的冰碛记录分辨率优于新仙女木事件（Younger Dryas，12.9~11.7 ka BP）。然而在玻利维亚阿尔蒂普拉诺盆地，北半球的两段冷期——海因里希冷期1a（Heinrich Stadial 1a，16.5~14.5 ka BP）与新仙女木事件——均与以下两个现象同期：（i）古冰川的大规模前进或停滞；（ii）巨型古湖陶卡湖与科伊帕萨湖的湖侵期。
本研究针对玻利维亚安第斯山脉末次冰消期（Termination 1）形成的冰川地貌，获取了新的宇宙射线暴露（cosmic ray exposure, CRE）年代数据。我们重建了各冰碛垄对应的平衡线海拔（equilibrium line altitudes, ELA），并将其结合古冰川与古湖泊收支的反演算法，以推算末次冰消期的温度与降水变化。
本研究的相对现代的温度距平（ΔT）重建结果显示出一致的区域变化趋势：17~14.5 ka BP期间，温度距平从-5℃逐步升高至-2.5℃，随后在南极冷回返事件期间（14.5~12.9 ka BP）重回-4℃左右的偏冷状态。科伊帕萨湖湖侵期（12.9~11.8 ka BP）与另一段增温趋势同期，随后在全新世初期（约10 ka BP）温度距平趋于稳定，约为-3℃。本研究结果表明，在末次冰消期（20~10 ka BP），热带安第斯山脉的大气温度复刻了南极的气候变化模式，而阿尔蒂普拉诺地区的降水则受北半球气候变化调控。