globalchange  > 气候变化事实与影响
Scopus记录号: 2-s2.0-85062734526
论文题名:
Pervasive cold ice within a temperate glacier-implications for glacier thermal regimes, sediment transport and foreland geomorphology
作者: Reinardy B.T.I.; Booth A.D.; Hughes A.L.C.; Boston C.M.; Åkesson H.; Bakke J.; Nesje A.; Giesen R.H.; Pearce D.M.
刊名: Cryosphere
ISSN: 19940416
出版年: 2019
卷: 13, 期:3
起始页码: 827
结束页码: 843
语种: 英语
英文摘要: This study suggests that cold-ice processes may be more widespread than previously assumed, even within temperate glacial systems. We present the first systematic mapping of cold ice at the snout of the temperate glacier Midtdalsbreen, an outlet of the Hardangerjøkulen icefield (Norway), from 43 line kilometres of ground-penetrating radar data. Results show a 40m wide cold-ice zone within the majority of the glacier snout, where ice thickness is < 10 m. We interpret ice to be cold-based across this zone, consistent with basal freeze-on processes involved in the deposition of moraines. We also find at least two zones of cold ice up to 15m thick within the ablation area, occasionally extending to the glacier bed. There are two further zones of cold ice up to 30m thick in the accumulation area, also extending to the glacier bed. Cold-ice zones in the ablation area tend to correspond to areas of the glacier that are covered by late-lying seasonal snow patches that reoccur over multiple years. Subglacial topography and the location of the freezing isotherm within the glacier and underlying subglacial strata likely influence the transport and supply of supraglacial debris and formation of controlled moraines. The wider implication of this study is the possibility that, with continued climate warming, temperate environments with primarily temperate glaciers could become polythermal in forthcoming decades with (i) persisting thinning and (ii) retreat to higher altitudes where subglacial permafrost could be and/or become more widespread. Adversely, the number and size of late-lying snow patches in ablation areas may decrease and thereby reduce the extent of cold ice, reinforcing the postulated change in the thermal regime. © 2019 Author(s).
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122652
Appears in Collections:气候变化事实与影响

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作者单位: Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Department of Earth Sciences, University of Bergen and Bjerknes Centre for Climate Research, Bergen, 5020, Norway; Department of Geography, University of Portsmouth, Portsmouth, PO1 3HE, United Kingdom; Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, TA 3508, Netherlands; Department of Biological and Environmental Sciences, University of Hertfordshire, Hatfield, AL10 9AB, United Kingdom; School of Environment, Education and Development, University of Manchester, Manchester, United Kingdom; HydroLogic Research, Delft, Netherlands

Recommended Citation:
Reinardy B.T.I.,Booth A.D.,Hughes A.L.C.,et al. Pervasive cold ice within a temperate glacier-implications for glacier thermal regimes, sediment transport and foreland geomorphology[J]. Cryosphere,2019-01-01,13(3)
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