The Arctic hydrological cycle is predicted to intensify as the Arctic warms, due to increased poleward moisture transport during summer and increased evaporation from seas once ice‐covered during winter. Records of past Arctic precipitation seasonality are important because they provide a context for these ongoing changes. In some Arctic lakes, stable isotopes of oxygen and hydrogen (δ¹⁸O and δ²H, respectively) vary seasonally, due to seasonal changes in precipitation δ¹⁸O and δ²H. We reconstruct precipitation seasonality from Lake N3, a well‐dated lake sediment archive in Disko Bugt, western Greenland, by generating Holocene records of two proxies that are produced at different times of the year, and therefore record different lake water seasonal isotopic compositions. Aquatic plants synthesize waxes throughout the summer, and their δ²H reflects winter‐biased precipitation δ²H at Lake N3, whereas chironomids synthesize their head capsules between late summer and winter, and their δ¹⁸O reflects summer‐biased precipitation δ¹⁸O at Lake N3. During the middle Holocene at Lake N3, aquatic plant leaf wax was strongly ²H‐depleted, while chironomid chitin was ¹⁸O‐enriched. We guide interpretations of these records using sensitivity tests of a lake water and energy balance model, where we change precipitation amount and isotope seasonality inputs. The sensitivity tests suggest that the contrasting trends between proxies were likely caused by an increase in precipitation amount during all seasons and an increase in precipitation isotope seasonality, in addition to proxy‐specific mechanisms, highlighting the importance of understanding lake‐ and proxy‐specific systematics when interpreting records from sediment archives.

中文翻译：

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使用配对的Chironomidδ18O和水生叶蜡δ2H方法重建全新世西部格陵兰岛的季节性

北极的水文循环预计将随着北极的变暖而加剧，这是由于夏季的极地水汽传输增加以及冬季冰层覆盖后海洋的蒸发增加。过去北极降水季节的记录很重要，因为它们为这些持续变化提供了背景。在一些北极湖泊，稳定的氧和氢（δ同位素¹⁸ O和δ ² H分别设置，）季节性变化，由于在沉淀δ季节变化¹⁸ O和δ ²H.我们通过生成在一年中不同时间产生的两个代理的全新世记录，从格陵兰岛迪斯科布格特一个良好的湖沉积物档案中的N3湖重建降水季节，因此记录了不同的湖水季节同位素组成。水生植物合成蜡整个夏天，他们δ ² ^ h反映冬季偏置沉淀δ ² H在N3湖，而摇蚊合成后期夏季和冬季，他们δ之间他们的头胶囊¹⁸ Ø反映夏季偏降水δ ¹⁸ Ø在N3湖。在N3湖中间全新世，水生植物叶蜡呈强² H-耗尽，而摇蚊几丁质是¹⁸富含O。我们使用湖泊水和能量平衡模型的敏感性测试来指导这些记录的解释，在其中我们改变降水量和同位素季节性输入。敏感性测试表明，代理之间的对比趋势可能是由于所有季节的降水量增加以及降水同位素季节性增加所致，除了特定于代理的机制外，突出了了解湖泊和特定于代理的系统的重要性。解释沉积物档案中的记录时。