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首页> 外文期刊>Geosciences >Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes
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Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes

机译：勘探内华达州科罗布纳以东（16°S，73°W，6377 m）向东北的冰川时代和古气候重建，热带安第斯山脉

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This work investigates the timing, paleoclimatic framework and inter-hemispheric teleconnections inferred from the glaciers last maximum extension and the deglaciation onset in the Arid Tropical Andes. A study area was selected to the northeastward of the Nevado Coropuna, the volcano currently covered by the largest tropical glacier on Earth. The current glacier extent, the moraines deposited in the past and paleoglaciers at their maximum extension have been mapped. The present and past Equilibrium Line Altitudes (ELA and paleoELA) have been reconstructed and the chlorine-36 ages have been calculated, for preliminary absolute dating of glacial and volcanic processes. The paleoELA depression, the thermometers installed in the study area and the accumulation data previously published allowed development of paleotemperature and paleoprecipitation models. The Coropuna glaciers were in maximum extension (or glacial standstill) ~20–12 ka ago (and maybe earlier). This last maximum extension was contemporary to the Heinrich 2–1 and Younger Dryas events and the Tauca and Coipasa paleolake transgressions on Bolivian Altiplano. The maximum paleoELA depression (991 m) shows a colder (?6.4 °C) and moister climate with precipitation ×1.2–×2.8 higher than the present. The deglaciation onset in the Arid Tropical Andes was 15–11 ka ago, earlier in the most southern, arid, and low mountains and later in the northernmost, less arid, and higher mountains.
机译：这项工作研究了从干旱最后的最大延伸和干旱热带安第斯山脉的冰消开始推断出的时间，古气候框架和半球间遥相关。内华达州科罗普纳（Nevado Coropuna）东北部选定了一个研究区域，该火山目前被地球上最大的热带冰川覆盖。绘制了目前的冰川范围，过去沉积的冰rain和最大冰川的古冰川。重建了当前和过去的平衡线高度（ELA和paleoELA），并计算了36岁的氯年龄，以初步确定冰川和火山过程的绝对年代。古ELA凹陷，安装在研究区域中的温度计以及先前发布的累积数据允许开发古温度和古降水模型。科罗布纳冰川在20到12 ka之前（甚至更早）处于最大程度的扩张（或冰川停滞）。最后一次最大的扩展是当代的海因里希2-1和Younger Dryas事件，以及玻利维亚高原上的Tauca和Coipasa Palolake越境事件。最大的古ELA凹陷（991 m）显示较冷（？6.4°C）和潮湿的气候，降水量比现在高1.2到2.8倍。干旱热带安第斯山脉的冰消作用发生在15-11 ka之前，最南部，干旱和低山早一些，随后出现在最北端，干旱少和高山区。

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