气候变化领域集成服务门户(CCPortal): Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities

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DOI	10.5194/tc-11-2691-2017
	Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
	How P.; Benn D.I.; Hulton N.R.J.; Hubbard B.; Luckman A.; Sevestre H.; Pelt W.J.J.V.; Lindbäck K.; Kohler J.; Boot W.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Subglacial hydrological processes at tidewater glaciers remain poorly understood due to the difficulty in obtaining direct measurements and lack of empirical verification for modelling approaches. Here, we investigate the subglacial hydrology of Kronebreen, a fast-flowing tidewater glacier in Svalbard during the 2014 melt season. We combine observations of borehole water pressure, supraglacial lake drainage, surface velocities and plume activity with modelled run-off and water routing to develop a conceptual model that thoroughly encapsulates subglacial drainage at a tidewater glacier. Simultaneous measurements suggest that an early-season episode of subglacial flushing took place during our observation period, and a stable efficient drainage system effectively transported subglacial water through the northern region of the glacier tongue. Drainage pathways through the central and southern regions of the glacier tongue were disrupted throughout the following melt season. Periodic plume activity at the terminus appears to be a signal for modulated subglacial pulsing, i.e. an internally driven storage and release of subglacial meltwater that operates independently of marine influences. This storage is a key control on ice flow in the 2014 melt season. Evidence from this work and previous studies strongly suggests that long-term changes in ice flow at Kronebreen are controlled by the location of efficient/inefficient drainage and the position of regions where water is stored and released. © 2017 Author.
学科领域	borehole; drainage; flushing; glacier flow; hydrology; ice flow; meltwater; plume; tidewater glacier; Arctic; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	borehole; drainage; flushing; glacier flow; hydrology; ice flow; meltwater; plume; tidewater glacier; Arctic; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119304
作者单位	Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; Department of Arctic Geology, University Centre in Svalbard, Longyearbyen, Norway; School of Geography and Sustainable Development, University of St. Andrews, Fife, United Kingdom; Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Department of Geography, College of Science, Swansea University, Swansea, United Kingdom; Department of Arctic Geophysics, University Centre in Svalbard, Longyearbyen, Norway; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Norwegian Polar Institute, Tromsø, Norway; Institute of Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	How P.,Benn D.I.,Hulton N.R.J.,et al. Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities[J],2017,11(6).
APA	How P..,Benn D.I..,Hulton N.R.J..,Hubbard B..,Luckman A..,...&Boot W..(2017).Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities.Cryosphere,11(6).
MLA	How P.,et al."Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities".Cryosphere 11.6(2017).