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首页> 外文期刊>Journal of quaternary science: JQS >Glacier fluctuations in the southern Peruvian Andes during the late-glacial period, constrained with cosmogenic 3He
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Glacier fluctuations in the southern Peruvian Andes during the late-glacial period, constrained with cosmogenic 3He

机译：冰川后期，秘鲁南部安第斯山脉的冰川波动，并受宇宙成因3He的限制

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摘要

The occurrence of pronounced climate reversals during the last glacial termination has long been recognised in palaeoclimate records from both hemispheres and from high to low latitudes. Accurate constraint of both the timing and magnitude of events, such as the Younger Dryas and Antarctic Cold Reversal, is vital in order to test different hypotheses for the causes and propagation of abrupt climate change. However, in contrast to higher-latitude regions, well-dated records from the Tropics are rare and the structure of late-glacial tropical climate remains uncertain. As a step toward addressing this problem, we present an in situ cosmogenic 3He surface exposure chronology from Nevado Coropuna, southern Peru, documenting a significant fluctuation of the ice margin during the late-glacial period. Ten tightly clustered ages from a pair of moraines located halfway between the modern glacier and the Last Glacial Maximum terminus range from 11.9 to 13.9ka and give an arithmetic mean age of 12.8±0.7ka (1σ). These data constitute direct evidence for a readvance, or prolonged stillstand, of glaciers in the arid Andes of southwestern Peru.
机译：长期以来，在上半个冰期终止期间发生明显的气候逆转已经在半球和高低纬度的古气候记录中得到了认可。为了检验突然的气候变化的成因和传播的不同假设，准确限制事件发生的时间和强度（例如年轻的树蛙和南极寒冷逆转）至关重要。然而，与高纬度地区相比，来自热带地区的日期记录很少，而且晚冰川热带气候的结构仍不确定。作为解决此问题的步骤，我们介绍了秘鲁南部内瓦多·科罗普纳的原位宇宙成因3He表面暴露年表，记录了冰川晚期冰川边缘的显着波动。来自现代冰川和最后冰川最大终点之间的一对冰rain的十个紧密聚集的年龄为11.9至13.9ka，算术平均年龄为12.8±0.7ka（1σ）。这些数据直接证明了秘鲁西南部干旱的安第斯山脉的冰川处于静止状态或长时间静止。

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