Bedrock sculpting under an active alpine glacier revealed from cosmic-ray muon radiography
Bedrock sculpting under an active alpine glacier revealed from cosmic-ray muon radiography
复制标题
宇宙射线μ子射线照相术揭示了活跃的高山冰川下的基岩雕刻
DOI：
10.1038/s41598-019-43527-6
复制
发表时间：
2019
影响因子：
4.6
通讯作者：
F. Schlunegger
中科院分区：
文献类型：
--
作者：
Ryuichi Nishiyama;Ryuichi Nishiyama;A. Ariga;T. Ariga;A. Lechmann;D. Mair;C. Pistillo;P. Scampoli;P. Valla;M. Vladymyrov;A. Ereditato;F. Schlunegger
山脉冰川形成了U形山谷、罗什木通山脉和基岩侵蚀造成的过度加深的景观。然而，几乎没有提供冰川活动的证据，特别是在冰川起源的平衡线海拔(ELA)以上的地区。这主要是因为我们缺乏关于高海拔地区活跃冰川下基岩形状的信息。在过去的几年里，人们用地球物理方法研究了活动冰川下的基岩形态，以推断基岩侵蚀的冰下机制。然而，这些包括对冰川表面的调查，从那里很难以足够的分辨率调查冰和基岩之间的横向边界。在这里，我们在宇宙射线介子衰减的帮助下对艾格冰川(瑞士，欧洲阿尔卑斯山)进行了介子射线检查。我们在堆积区内发现了一段(600 × 300 m)，在那里，强烈的横向冰川侵蚀几乎垂直地侵蚀了下伏的基岩。这表明艾格冰川在其堆积区已经深刻地雕刻了它的基岩。这也揭示了宇宙射线Muon射线照相术是重建活跃冰川下基岩形状的理想技术。
Mountain glaciers form landscapes with U-shaped valleys, roche moutonées and overdeepenings through bedrock erosion. However, little evidence for active glacial carving has been provided particularly for areas above the Equilibrium Line Altitude (ELA) where glaciers originate. This is mainly due to our lack of information about the shape of the bedrock underneath active glaciers in highly elevated areas. In the past years, the bedrock morphology underneath active glaciers has been studied by geophysical methods in order to infer the subglacial mechanisms of bedrock erosion. However, these comprise surveys on the glaciers’ surface, from where it has been difficult to investigate the lateral boundary between the ice and the bedrock with sufficient resolution. Here we perform a muon-radiographic inspection of the Eiger glacier (Switzerland, European Alps) with the aid of cosmic-ray muon attenuation. We find a reach (600 × 300 m) within the accumulation area where strong lateral glacial erosion has cut nearly vertically into the underlying bedrock. This suggests that the Eiger glacier has profoundly sculpted its bedrock in its accumulation area. This also reveals that the cosmic-ray muon radiography is an ideal technology to reconstruct the shape of the bedrock underneath an active glacier.
影响因子：
5
作者：
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli
通讯作者：
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli
欧洲阿尔卑斯山的冰川等静态升高。
影响因子：
16.6
作者：
Mey, Juergen;Scherler, Dirk;Wickert, Andrew D.;Egholm, David L.;Tesauro, Magdala;Schildgen, Taylor F.;Strecker, Manfred R.
通讯作者：
Strecker, Manfred R.