The configuration of Northern Hemisphere ice sheets through the Quaternary
The configuration of Northern Hemisphere ice sheets through the Quaternary
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DOI：
10.1038/s41467-019-11601-2
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发表时间：
2019-08-16
影响因子：
16.6
通讯作者：
Manica, Andrea
中科院分区：
文献类型：
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作者：
Batchelor, Christine L.;Margold, Martin;Manica, Andrea
我们对全球气候变化如何转化为冰盖波动和海平面变化的理解目前受到缺乏末次盛冰期（LGM）之前冰盖结构知识的限制。在这里，我们编译了一个综合的经验数据和数值模拟结果有关的前LGM冰盖产生新的假设，其范围在北方半球（NH）在17个时间片，跨越第四纪。我们的重建说明了明显的冰盖不对称的最后一次冰期循环和显着变化的冰边缘位置之间的旧冰期循环。我们发现支持的Laurentide冰盖（LIS）在MIS 3期间的范围显着减少，这意味着全球海平面可能比以前的估计高出30-40米。我们的冰盖重建说明了当前国家的最先进的知识前LGM冰盖，并提供了一个概念框架来解释NH景观演变。
Our understanding of how global climatic changes are translated into ice-sheet fluctuations and sea-level change is currently limited by a lack of knowledge of the configuration of ice sheets prior to the Last Glacial Maximum (LGM). Here, we compile a synthesis of empirical data and numerical modelling results related to pre-LGM ice sheets to produce new hypotheses regarding their extent in the Northern Hemisphere (NH) at 17 time-slices that span the Quaternary. Our reconstructions illustrate pronounced ice-sheet asymmetry within the last glacial cycle and significant variations in ice-marginal positions between older glacial cycles. We find support for a significant reduction in the extent of the Laurentide Ice Sheet (LIS) during MIS 3, implying that global sea levels may have been 30-40 m higher than most previous estimates. Our ice-sheet reconstructions illustrate the current state-of-the-art knowledge of pre-LGM ice sheets and provide a conceptual framework to interpret NH landscape evolution.