期刊
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
卷 127, 期 1, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021JF006256
关键词
rock glacier; glacier-rock glacier transition; Tibetan Plateau; semiarid climate; geophysics; remote sensing
资金
- Deutsche Forschungsgemeinschaft (DFG) [317513741/GRK 2309, GRK 2309/1]
- Projekt DEAL
Rock glaciers are being studied as a potential water source and indicator of climate change. This research focused on a rock glacier in the Tibetan Plateau and used various methods to investigate its characteristics including kinematics, ice content, and activity layer. The study also revealed the sorting of debris in the rock glacier and highlighted the influence of the glacier's location on its characteristics and development.
Rock glaciers are receiving increased attention as a potential source of water and indicator of climate change in periglacial landscapes. They consist of an ice-debris mixture, which creeps downslope. Although rock glaciers are a wide-spread feature on the Tibetan Plateau, characteristics such as its ice fraction are unknown as a superficial debris layer inhibits remote assessments. We investigate one rock glacier in the semiarid western Nyainqentanglha range (WNR) with a multi-method approach, which combines geophysical, geological and geomorphological field investigations with remote sensing techniques. Long-term kinematics of the rock glacier are detected by 4-year InSAR time series analysis. The ice content and the active layer are examined by electrical resistivity tomography, ground penetrating radar, and environmental seismology. Short-term activity (11-days) is captured by a seismic network. Clast analysis shows a sorting of the rock glacier's debris. The rock glacier has three zones, which are defined by the following characteristics: (a) Two predominant lithology types are preserved separately in the superficial debris patterns, (b) heterogeneous kinematics and seismic activity, and (c) distinct ice fractions. Conceptually, the studied rock glacier is discussed as an endmember of the glacier-debris-covered glacier-rock glacier continuum. This, in turn, can be linked to its location on the semiarid lee-side of the mountain range against the Indian summer monsoon. Geologically preconditioned and glacially overprinted, the studied rock glacier is suggested to be a recurring example for similar rock glaciers in the WNR. This study highlights how geology, topography and climate influence rock glacier characteristics and development.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据