Holocene glacier fluctuations on the northern flank of Cordillera Darwin, southernmost South America
Holocene glacier fluctuations on the northern flank of Cordillera Darwin, southernmost South America
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南美洲最南端达尔文山脉北侧的全新世冰川波动
DOI：
10.1016/j.quascirev.2019.105904
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发表时间：
2019
影响因子：
4
通讯作者：
A. Putnam
中科院分区：
文献类型：
--
作者：
B. Hall;T. Lowell;G. Bromley;G. Denton;A. Putnam
过去的可变性记录为评估当今的冰川行为和检验气候变化假说提供了背景。在这里，我们使用69个与冰川沉积有关的木材和其他有机材料的放射性碳测年来记录科迪勒拉达尔文的文斯奎罗和布鲁克斯在过去17,000年∼的行为。从上一次冰川盛期开始的衰退是早期的，大多数发生在17,000 年BP之前。南极冰川逆转期间的任何冰川复苏都必须在全新世冰川波动的范围内终止。到全新世早期，文蒂斯奎罗·马里内利已经撤退到不比1992年更广泛的程度。我们确定了随后的几次冰川再抬升，但也注意到冰川范围受到长期限制，特别是在全新世中期。曾经有一段时间，全新世的冰川肯定比现在更小。我们来自Marinelli的新记录显示了与南美洲南部重建的全新世冰川变化的其他相似之处，例如在Mt.萨尔米恩托和南巴塔哥尼亚冰原，暗示了潜在的气候信号。总体来说，这意味着全新世早期大量的冰川消退，然后反复推进，其间穿插着冰川面积比现在小的退缩时期。这种冰川行为的一般模式似乎不同于新西兰南阿尔卑斯山的冰川行为，并指出了地理分布的数据集对阐明全新世南半球气候模式的价值。
Records of past variability afford context for evaluating present-day glacier behavior and for testing hypotheses of climate change. Here, we use 69 radiocarbon dates of wood and other organic materials in association with glacial deposits to document the behavior of Ventisqueros Marinelli and Brooks in Cordillera Darwin over the past ∼17,000 years. Recession from the last glacial maximum was early, with most occurring prior to 17,000 yr BP. Any glacial resurgence during the Antarctic Cold Reversal must have terminated within the bounds of Holocene ice fluctuations. By early Holocene time, Ventisquero Marinelli had retreated such that it was no more extensive than it was in AD 1992. We identify several subsequent glacier readvances, but also note long periods of restricted ice extent, particularly in the mid-Holocene. There were times when Holocene glaciers must have been smaller than at present. Our new record from Marinelli shows similarities to other reconstructions of Holocene glacier variation from southern South America, such as at Mt. Sarmiento and the South Patagonian Icefield, suggesting an underlying climate signal. The overall implication is of substantial early Holocene deglaciation followed by repeated advances interspersed with periods of recession when ice extent was smaller than at present. This general pattern of glacier behavior appears to differ from that of New Zealand's Southern Alps and points to the value of a geographic spread of datasets to elucidate the pattern of Southern Hemisphere climate during the Holocene.
影响因子：
5.3
作者：
Kaplan, Michael R.;Strelin, Jorge A.;Travis, Scott G.
通讯作者：
Travis, Scott G.
南巴塔哥尼亚冰原拉戈阿根廷盆地的全新世冰川历史
影响因子：
4
作者：
Strelin, Jorge A.;Kaplan, Michael R.;Vandergoes, Marcus J.;Denton, George H.;Schaefer, Joerg M.
通讯作者：
Schaefer, Joerg M.