Laurentide Ice Sheet persistence during Pleistocene interglacials
Laurentide Ice Sheet persistence during Pleistocene interglacials
复制标题
更新世间冰期期间劳伦太德冰盖的持续存在
DOI：
10.1130/g50820.1
复制
发表时间：
2023
期刊：
影响因子：
5.8
通讯作者：
Hidy, Alan J.
中科院分区：
文献类型：
--
作者：
LeBlanc, Danielle E.;Shakun, Jeremy D.;Corbett, Lee B.;Bierman, Paul R.;Caffee, Marc W.;Hidy, Alan J.
虽然今天格陵兰岛以外的北半球没有冰盖，但不确定大多数其他第四纪间冰期是否也是如此。我们使用冰筏碎片中的原位生核素表明，劳伦太德冰盖在第四纪间冰期期间可能比通常认为的更持久。海洋核心沉积物中的低 26Al/10Be 比率（表明源区被埋藏）表明沉积物源区在过去数百万年中仅经历过短暂（大约数千年）和/或罕见的无冰间冰期。这些结果意味着，劳伦泰德冰川完全消失可能只有在气候强迫达到与全新世早期相当的水平时才会发生，这使得我们目前的间冰期相对于中更新世中晚期的其他间冰期来说是不寻常的。
While there are no ice sheets in the Northern Hemisphere outside of Greenland today, it is uncertain whether this was also the case during most other Quaternary interglacials. We show, usingin situcosmogenic nuclides in ice-rafted debris, that the Laurentide Ice Sheet was likely more persistent during Quaternary interglacials than often thought. Low26Al/10Be ratios (indicative of burial of the source area) in marine core sediment suggest sediment source areas experienced only brief (on the order of thousands of years) and/or infrequent ice-free interglacials over the past million years. These results imply that complete Laurentide deglaciation may have only occurred when climate forcings reached levels comparable to those of the early Holocene, making our current interglacial unusual relative to others of the mid-to-late Pleistocene.