Late Holocene reexpansion of the Laurentide Ice Sheet

IF 47.3 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2026-10-22 DOI:10.1126/science.aed3379

Nicolás E. Young, Gifford H. Miller, Martha Raynolds, Helga Bueltmann, Scott J. Lehman, Jonathan H. Raberg, Kylie Seward, Simon L. Pendleton, John T. Andrews, Patrick J. Webber, Joerg M. Schaefer

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Abstract

During interglaciations, the Laurentide Ice Sheet (LIS), which is the largest of the Pleistocene ice sheets, retreats to Arctic Canada, where it achieves a minimum configuration. The reexpansion of the LIS following this minimum marks the start of the next glaciation. Here, we show that the last remaining remnant of the most recent LIS, Barnes Ice Cap (Baffin Island, Canada), achieved its minimum interglacial dimensions after ~3.6 thousand years ago, before reexpanding ~2000 years ago, marking the onset of the next glaciation. The new LIS reached maximum dimensions in ~1960 CE, after which anthropogenic summer warming resulted in a negative mass balance, ice margin recession, and the termination of the next glaciation. The demise of the next glaciation, despite the ongoing decline in summer insolation, illustrates the influence of anomalous greenhouse gas forcing on climate.

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全新世晚期劳伦泰德冰盖的再扩张

在间冰期，更新世冰原中最大的劳伦泰德冰原（LIS）退缩到加拿大北极，在那里它达到了最小的配置。在这个最小值之后，冰川的再扩张标志着下一个冰期的开始。在这里，我们展示了最近的LIS的最后残余，巴恩斯冰帽（加拿大巴芬岛），在约3.6万年前达到了最小的间冰期尺寸，然后在约2000年前重新扩张，标志着下一个冰期的开始。新LIS在~1960 CE达到最大值，此后人为夏季增暖导致负物质平衡、冰缘退缩和下一个冰期的终止。尽管夏季日照持续减少，但下一个冰期的结束说明了异常温室气体强迫对气候的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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