Coastal permafrost was massively eroded during the Bølling-Allerød warm period

Coastal permafrost was massively eroded during the Bølling-Allerød warm period
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伯林-阿勒德暖期期间,沿海永久冻土层遭到大规模侵蚀

DOI:
10.1038/s43247-023-01013-y
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发表时间:
2023
影响因子:
7.9
通讯作者:
Nogarotto A
Nogarotto A
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Nogarotto A

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在最后一次冰消期,伯林-阿勒罗德冰间(距今14,700 - 12,900年)的特征是快速变暖和海平面上升。然而,北极陆地冰冻圈在这一突然的气候变化期间的反应迄今仍然难以捉摸。在这里,我们提出了一个多代理分析的沉积物记录从北方斯瓦尔巴特群岛大陆边缘,一个地区的海冰出口从北极的强烈影响,阐明海平面永久冻土侵蚀的连接。我们发现,丰富的生物圈碳的永冻层衍生材料成为沉积物的主要来源在开始的Bølling-Allerød,尽管缺乏直接的连接与永冻层沉积。我们的研究结果表明,突然的温度和海平面上升引发了大量的沿海冰丰富的Yedoma永久冻土侵蚀,可能从西伯利亚和阿拉斯加海岸,其次是长距离海冰运输到弗拉姆海峡和北冰洋门户。总的来说,我们展示了沿海永久冻土是如何在快速气候变化的情况下容易受到大规模的再动员。
The Bølling-Allerød interstadial (14,700–12,900 years before present), during the last deglaciation, was characterized by rapid warming and sea level rise. Yet, the response of the Arctic terrestrial cryosphere during this abrupt climate change remains thus far elusive. Here we present a multi-proxy analysis of a sediment record from the northern Svalbard continental margin, an area strongly influenced by sea ice export from the Arctic, to elucidate sea level - permafrost erosion connections. We show that permafrost-derived material rich in biospheric carbon became the dominant source of sediments at the onset of the Bølling-Allerød, despite the lack of direct connections with permafrost deposits. Our results suggest that the abrupt temperature and sea level rise triggered massive erosion of coastal ice-rich Yedoma permafrost, possibly from Siberian and Alaskan coasts, followed by long-range sea ice transport towards the Fram Strait and the Arctic Ocean gateway. Overall, we show how coastal permafrost is susceptible to large-scale remobilization in a scenario of rapid climate variability.
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