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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial
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Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial

机译：全新世和最后一次冰期之间格陵兰西北部的夏季明显变暖

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Projections of future rates of mass loss from the Greenland Ice Sheet are highly uncertain because its sensitivity to warming is unclear. Geologic reconstructions of Quaternary interglacials can illustrate how the ice sheet responded during past warm periods, providing insights into ice sheet behavior and important tests for data-model comparisons. However, paleoclimate records from Greenland are limited: Early Holocene peak warmth has been quantified at only a few sites, and terrestrial sedimentary records of prior interglacials are exceptionally rare due to glacial erosion during the last glacial period. Here, we discuss findings from a lacustrine archive that records both the Holocene and the Last Interglacial (LIG) from Greenland, allowing for direct comparison between two interglacials. Sedimentary chironomid assemblages indicate peak July temperatures 4.0 to 7.0 °C warmer than modern during the Early Holocene maximum in summer insolation. Chaoborus and chironomids in LIG sediments indicate July temperatures at least 5.5 to 8.5 °C warmer than modern. These estimates indicate pronounced warming in northwest Greenland during both interglacials. This helps explain dramatic ice sheet thinning at Camp Century in northwest Greenland during the Early Holocene and, for the LIG, aligns with controversial estimates of Eemian warming from ice core data retrieved in northern Greenland. Converging geologic evidence for strong LIG warming is challenging to reconcile with inferred Greenland Ice Sheet extent during the LIG, and the two appear incompatible in many models of ice sheet evolution. An increase in LIG snowfall could help resolve this problem, pointing to the need for hydroclimate reconstructions from the region.
机译：由于格陵兰冰原对变暖的敏感性尚不清楚，因此对未来格陵兰冰原的质量损失率的预测高度不确定。第四纪间冰期的地质重建可以说明冰盖在过去的温暖时期是如何反应的，从而提供了对冰盖行为的洞察力以及用于数据模型比较的重要检验。但是，格陵兰的古气候记录是有限的：全新世早期的峰值暖化仅在少数几个地点进行了量化，并且由于最后一个冰川期的冰川侵蚀，以前的间冰期的陆地沉积记录极为罕见。在这里，我们讨论了湖相档案中的发现，该档案记录了全新世和格陵兰岛的上一次冰间期（LIG），从而可以直接比较两个冰间期。沉积的日光体组合表明，夏季夏季的全新世早期最大值，7月的峰值温度比现代温度高4.0至7.0°C。 LIG沉积物中的潮虫和奇异虫表明7月份的温度比现代温度高至少5.5至8.5°C。这些估计值表明，两次冰期之间格陵兰西北部的升温明显。这有助于解释全新世早期在格陵兰岛西北部Camp Camp的急剧冰盖变薄，并且对于LIG，这与从格陵兰岛北部的冰芯数据中对Eemian变暖的有争议的估计相吻合。在LIG期间，要想将LIG强烈变暖的地质证据融合起来，就很难与推断的格陵兰冰盖范围协调一致，而且这两者在许多冰盖演化模型中似乎是不相容的。 LIG降雪的增加可能有助于解决该问题，这表明需要对该地区进行水文气候重建。

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