Arctic precipitation is predicted to increase this century. Records of past precipitation seasonality provide baselines for a mechanistic understanding of the dynamics controlling Arctic precipitation. We present an approach to reconstruct Arctic precipitation seasonality using stable hydrogen isotopes (δ²H) of aquatic plant waxes in neighboring lakes with contrasting water residence times and present a case study of this approach in two lakes on western Greenland. Residence time calculations suggest that growing season lake water δ²H in one lake reflects summer precipitation δ²H, while the other reflects amount‐weighted annual precipitation δ²H and evaporative enrichment. Aquatic plant wax δ²H in the “summer lake” is relatively constant throughout the Holocene, perhaps reflecting competing effects of local summer warmth and increased distal moisture transport due to a strengthened latitudinal temperature gradient. In contrast, aquatic plant wax δ²H in the “mean annual lake” is 100‰ ²H depleted from 6 to 4 ka relative to the beginning and end of the record. Because there are relatively minor changes in summer precipitation δ²H, we interpret the 100‰ ²H depletion in mean annual precipitation to reflect an increase in winter precipitation amount, likely accompanied by changes in winter precipitation δ²H and decreased evaporative enrichment. Thus, unlike the “summer lake,” the “mean annual lake” records changes in winter precipitation. This dual‐lake approach may be applied to reconstruct past changes in precipitation seasonality at sites with strong precipitation isotope seasonality and minimal lake water evaporative enrichment.

中文翻译：

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在停留时间相反的湖泊中利用水生蜡蜡δ2H重建北极降水的季节性

预计本世纪北极降水将增加。过去降水季节性的记录为机械控制北极降水的机理提供了基线。我们提出了一个方法来重建北极降水的季节性使用稳定的氢同位素（δ ² H）在与对比水停留时间，并在格陵兰岛西部的两个湖泊目前，这种方法为例邻近湖泊水生植物蜡。停留时间的计算表明，生长季节湖水δ ²在一个湖^ h反映夏季降水δ ² H，而另一个反映量加权年均降水量δ ² H和蒸发浓缩。水生植物蜡δ ²在整个全新世中，“夏季湖泊”中的H相对恒定，这可能反映了局部夏季温暖的竞争效应以及由于纬向温度梯度增强而增加的远侧水分输送。与此相反，水生植物蜡δ ² h在“年平均湖”是100‰ ² ħ耗尽6至4か相对于所述记录的开始和结束。因为在夏季降水相对小的变化δ ² H，我们解释100‰ ²平均年降水量^ h枯竭，以反映冬季降水量的增加，可能伴随冬季降水δ变化²H和减少的蒸发富集。因此，与“夏季湖泊”不同，“平均年度湖泊”记录了冬季降水的变化。这种双湖方法可用于重建降水同位素季节性强，湖水蒸发富集最少的地点过去的降水季节性变化。