近日，美国哥伦比亚大学拉蒙特-多尔蒂地球观测站Nicolás E. Young团队报道了劳伦蒂德冰盖全新世晚期的再膨胀。该项研究成果发表在2026年10月22日出版的《科学》杂志上。

在间冰期，劳伦泰德冰盖（LIS，更新世冰盖中最大的一个）退缩至加拿大北极地区，并在那里达到最小配置。LIS在达到这一最小值之后重新扩张，标志着下一次冰期的开始。

研究组表明，最近一次LIS的最后残余（巴恩斯冰帽（加拿大巴芬岛））在约3600年前达到其间冰期最小尺寸，随后在约2000年前重新扩张，标志着下一次冰期的开始。新的LIS在约公元1960年达到最大尺寸，此后人为夏季增暖导致质量平衡为负、冰缘退缩以及下一次冰期的终止。尽管夏季太阳辐射持续下降，下一次冰期仍然终止，这说明了异常温室气体强迫对气候的影响。

附：英文原文

Title: Late Holocene reexpansion of the Laurentide Ice Sheet

Author: 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

Issue&Volume: 2026-10-22

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.

DOI: 10.1126/science.aed3379

Source: https://www.science.org/doi/10.1126/science.aed3379