Seafloor geomorphology of western Antarctic Peninsula bays : a signature of ice flow behaviour
Seafloor geomorphology of western Antarctic Peninsula bays : a signature of ice flow behaviour
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南极半岛西部海湾的海底地貌：冰流行为的特征
DOI：
10.5194/tc-2017-108
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发表时间：
2017
影响因子：
5.3
通讯作者：
J. Wellner
中科院分区：
文献类型：
--
作者：
Yuribia P. Munoz;J. Wellner
冰川地貌学在南极洲被用来重建末次盛冰期的冰川推进和随后跨越大陆架的退缩。在冰川峡湾中发现了类似的地貌组合，并用于解释这些地区的冰川历史和冰川动力学。此外，了解海湾中海底地貌的分布以及对冰流的局部控制可以通过提供这些流域的约束来帮助改进数值模型。本文介绍了南设得兰群岛和南极半岛西部几个海湾的多波束带测深方法。对海底地貌进行了详细的描述和解释。建立了一个示意图模型，显示了海湾的特征：从内湾的冰川线纹和冰碛，到中湾的磨地带楔形和鼓状特征，以及外湾地区的流线型特征和融水通道。此外，我们分析了海湾的局部变量，并观察到以下几点：(1)海湾中发现的地貌数量与海湾的大小有关，但海湾的几何形状决定了形成的特征类型；具体来说，我们观察到海湾宽度与海湾中存在的横向特征数量之间存在相关性。(2)较小的海底特征只出现在较小的冰川系统中，这表明造成这些地貌形成的短暂的大气和海洋波动只记录在这些较小的冰川系统中。(3)海底融水通道丰富，但有些是冰下的，雕刻在基岩上，有些是现代侵蚀特征，雕刻在软沉积物上。最后，根据地貌学证据，我们提出在一些近海湾地区发现的特征是在最近的冰川推进期间形成的，可能是小冰期。
Glacial geomorphology is used in Antarctica to reconstruct ice advance during the Last Glacial Maximum and subsequent retreat across the continental shelf. Analogous geomorphic assemblages are found in glaciated fjords and are used to interpret the glacial history and glacial dynamics in those areas. In addition, understanding the distribution of submarine landforms in bays and the local controls exerted on ice flow can help improve numerical models by providing constraints through these drainage areas. We present multibeam swath bathymetry from several bays in the South Shetland Islands and the western Antarctic Peninsula. The submarine landforms are described and interpreted in detail. A schematic model was developed showing the features found in the bays: from glacial lineations and moraines in the inner bay to grounding zone wedges and drumlinoid features in the middle bay and streamlined features and meltwater channels in the outer bay areas. In addition, we analysed local variables in the bays and observed the following: (1) the number of landforms found in the bays scales to the size of the bay, but the geometry of the bays dictates the types of features that form; specifically, we observe a correlation between the bay width and the number of transverse features present in the bays. (2) The smaller seafloor features are present only in the smaller glacial systems, indicating that short-lived atmospheric and oceanographic fluctuations, responsible for the formation of these landforms, are only recorded in these smaller systems. (3) Meltwater channels are abundant on the seafloor, but some are subglacial, carved in bedrock, and some are modern erosional features, carved on soft sediment. Lastly, based on geomorphological evidence, we propose the features found in some of the proximal bay areas were formed during a recent glacial advance, likely the Little Ice Age.
影响因子：
18.3
作者：
S. Jamieson;A. Vieli;S. Livingstone;C. Ó. Cofaigh;C. Stokes;C. Hillenbrand;J. Dowdeswell
通讯作者：
S. Jamieson;A. Vieli;S. Livingstone;C. Ó. Cofaigh;C. Stokes;C. Hillenbrand;J. Dowdeswell
南极半岛西部玛格丽特湾古冰流的冰川地貌
影响因子：
2.2
作者：
Livingstone S
通讯作者：
Livingstone S
影响因子：
16.6
作者：
Graham AG;Kuhn G;Meisel O;Hillenbrand CD;Hodgson DA;Ehrmann W;Wacker L;Wintersteller P;Dos Santos Ferreira C;Römer M;White D;Bohrmann G
通讯作者：
Bohrmann G