气候变化领域集成服务门户(CCPortal): Rapid development and persistence of efficient subglacial drainage under 900 m-thick ice in Greenland

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DOI	10.1016/j.epsl.2021.116982
	Rapid development and persistence of efficient subglacial drainage under 900 m-thick ice in Greenland
	Chandler D.M.; Wadham J.L.; Nienow P.W.; Doyle S.H.; Tedstone A.J.; Telling J.; Hawkings J.; Alcock J.D.; Linhoff B.; Hubbard A.
发表日期	2021
ISSN	0012821X
卷号	566
英文摘要	Intensive study of the Greenland Ice Sheet's (GrIS) subglacial drainage has been motivated by its importance for ice dynamics and for nutrient/sediment export to coastal ecosystems. This has revealed consistent seasonal development of efficient subglacial drainage in the lower ablation area. While some hydrological models show qualitative agreement with field data, conflicting evidence (both field- and model-based) maintains uncertainty in the extent and rate of efficient drainage development under thick (∼1 km) ice. Here, we present the first simultaneous time series of directly-observed subglacial drainage evolution, supraglacial hydrology and ice dynamics over 11 weeks in a large GrIS catchment. We demonstrate development of a fast/efficient subglacial drainage system extending from the margin to beneath ice >900 m thick, which then persisted with little response to highly variable moulin inputs including extreme melt events and extended periods (2 weeks) of low melt input. This efficient system evolved within ∼3 weeks at a moulin initiated when a fracture intersected a supraglacial river (rather than hydrofracture and lake drainage). Ice flow response to surface melt inputs at this site follows a pattern commonly observed in the lower GrIS ablation area, and by assuming a strong relationship between ice dynamics and subglacial hydrology, we infer that efficient subglacial drainage evolution is widespread under 900 m-thick ice in west Greenland. This time series of tracer transit characteristics through a developing and then persistent efficient drainage system provides a unique data set with which to validate and constrain existing numerical drainage system models, extending their capability for simulating drainage system evolution under current and future conditions. © 2021 The Authors
关键词	Greenland Ice Sheet hydrology ice fracture moulin subglacial drainage
英文关键词	Ablation; Catchments; Drainage; Dynamics; Ecosystems; Glacial geology; Glaciers; Time series; Ablation area; Drainage systems; Green land; Greenland Ice Sheet; Ice dynamics; Ice fractures; Moulin; Sediment exports; Subglacial drainage; Times series; Ice; ablation; drainage; glacial hydrology; hydrological modeling; ice core; ice flow; ice sheet; subglacial deposit; uncertainty analysis; Arctic; Greenland; Greenland Ice Sheet
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203050
作者单位	NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway; Bristol Glaciology Centre, University of Bristol, Bristol, United Kingdom; CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT the Arctic University of Norway, Tromsø, 9010, Norway; Department of Geosciences, University of Edinburgh, Edinburgh, United Kingdom; Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Department of Geosciences, University of Fribourg, Fribourg, Switzerland; School of Natural and Environmental Sciences, Newcastle University, Newcastle, United Kingdom; National High Magnetic Field Laboratory Geochemistry Group, the Department of Earth, Ocean and Atmospheric Sciences, Florida State University, United States; German Research Centre for Geosciences GFZ, Potsdam, Germany; US Geological Survey, New Mexico Water Science Center, Albuquerque, NM, United States; Kvantum Institute, University of O...
推荐引用方式 GB/T 7714	Chandler D.M.,Wadham J.L.,Nienow P.W.,et al. Rapid development and persistence of efficient subglacial drainage under 900 m-thick ice in Greenland[J],2021,566.
APA	Chandler D.M..,Wadham J.L..,Nienow P.W..,Doyle S.H..,Tedstone A.J..,...&Hubbard A..(2021).Rapid development and persistence of efficient subglacial drainage under 900 m-thick ice in Greenland.Earth and Planetary Science Letters,566.
MLA	Chandler D.M.,et al."Rapid development and persistence of efficient subglacial drainage under 900 m-thick ice in Greenland".Earth and Planetary Science Letters 566(2021).