DOI: 10.5194/tc-12-549-2018
Scopus记录号: 2-s2.0-85042096358
论文题名: Sub-seasonal thaw slump mass wasting is not consistently energy limited at the landscape scale
作者: Zwieback S ; , Kokelj S ; , Günther F ; , Boike J ; , Grosse G ; , Hajnsek I
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 2 起始页码: 549
结束页码: 564
语种: 英语
英文摘要: Predicting future thaw slump activity requires a sound understanding of the atmospheric drivers and geomorphic controls on mass wasting across a range of timescales. On sub-seasonal timescales, sparse measurements indicate that mass wasting at active slumps is often limited by the energy available for melting ground ice, but other factors such as rainfall or the formation of an insulating veneer may also be relevant. To study the sub-seasonal drivers, we derive topographic changes from single-pass radar interferometric data acquired by the TanDEM-X satellites. The estimated elevation changes at 12ĝ€m resolution complement the commonly observed planimetric retreat rates by providing information on volume losses. Their high vertical precision (around 30ĝ€cm), frequent observations (11 days) and large coverage (5000ĝ€km2) allow us to track mass wasting as drivers such as the available energy change during the summer of 2015 in two study regions. We find that thaw slumps in the Tuktoyaktuk coastlands, Canada, are not energy limited in June, as they undergo limited mass wasting (height loss of around 0ĝ€cmĝ€dayĝ'1) despite the ample available energy, suggesting the widespread presence of early season insulating snow or debris veneer. Later in summer, height losses generally increase (around 3ĝ€cmĝ€dayĝ'1), but they do so in distinct ways. For many slumps, mass wasting tracks the available energy, a temporal pattern that is also observed at coastal yedoma cliffs on the Bykovsky Peninsula, Russia. However, the other two common temporal trajectories are asynchronous with the available energy, as they track strong precipitation events or show a sudden speed-up in late August respectively. The observed temporal patterns are poorly related to slump characteristics like the headwall height. The contrasting temporal behaviour of nearby thaw slumps highlights the importance of complex local and temporally varying controls on mass wasting. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75421
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geography, University of Guelph, Guelph, Canada; Department of Environmental Engineering, ETH Zurich, Zurich, Switzerland; Northwest Territories Geological Survey, Government of Northwest Territories, Yellowknife, Canada; Periglacial Research, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; Institute for Earth and Environmental Science, University of Potsdam, Potsdam, Germany; Microwaves and Radar Institute, German Aerospace Center (DLR), Wessling, Germany
Recommended Citation:
Zwieback S,, Kokelj S,, Günther F,et al. Sub-seasonal thaw slump mass wasting is not consistently energy limited at the landscape scale[J]. Cryosphere,2018-01-01,12(2)