A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
复制标题
DOI：
10.1016/j.quascirev.2014.06.025
复制
发表时间：
2014-09-15
影响因子：
4
通讯作者：
Zwartz, Dan
中科院分区：
文献类型：
--
作者：
Bentley, Michael J.;Cofaigh, Colm O.;Zwartz, Dan
一个强大的了解南极冰盖冰川消退的历史，因为末次冰盛期是很重要的，以约束冰盖和冰川均衡调整模型，并探索强迫机制负责冰盖退缩。这种理解可以从广泛的地质和冰川学数据集中获得，近几十年来，在大陆和亚南极岛屿周围收集此类数据的工作激增。在这里，我们报告了这些数据集的新综合，基于对地质数据的一系列审查，按部门组织。我们提出了一系列的时间片地图为20万年，15万年，10万年和5万年，包括接地线的位置和冰盖厚度的变化，沿着与一个明确的评估水平的信心。重建结果表明，南极冰盖并不是在所有地方都达到大陆架边缘的最大值，最初的退缩是异步的，冰川消退的空间格局是高度可变的，特别是在大陆架内部。冰消重建是一致的，与温和的整体多余的冰量，并与一个相对较小的南极融水脉冲LA的贡献。我们讨论了非洲大陆和时间间隔的不确定性的关键领域，并强调了未来工作的潜在优先事项。该综述旨在成为建模和冰川地质界的一个资源。(C)2014作者爱思唯尔有限公司出版
A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse la. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community. (C) 2014 The Authors. Published by Elsevier Ltd.