气候变化领域集成服务门户(CCPortal): Hydraulic transmissivity inferred from ice-sheet relaxation following Greenland supraglacial lake drainages

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DOI	10.1038/s41467-021-24186-6
	Hydraulic transmissivity inferred from ice-sheet relaxation following Greenland supraglacial lake drainages
	Lai C.-Y.; Stevens L.A.; Chase D.L.; Creyts T.T.; Behn M.D.; Das S.B.; Stone H.A.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Surface meltwater reaching the base of the Greenland Ice Sheet transits through drainage networks, modulating the flow of the ice sheet. Dye and gas-tracing studies conducted in the western margin sector of the ice sheet have directly observed drainage efficiency to evolve seasonally along the drainage pathway. However, the local evolution of drainage systems further inland, where ice thicknesses exceed 1000 m, remains largely unknown. Here, we infer drainage system transmissivity based on surface uplift relaxation following rapid lake drainage events. Combining field observations of five lake drainage events with a mathematical model and laboratory experiments, we show that the surface uplift decreases exponentially with time, as the water in the blister formed beneath the drained lake permeates through the subglacial drainage system. This deflation obeys a universal relaxation law with a timescale that reveals hydraulic transmissivity and indicates a two-order-of-magnitude increase in subglacial transmissivity (from 0.8 ± 0.3 m m 3 to 215 ± 90.2 m m 3) as the melt season progresses, suggesting significant changes in basal hydrology beneath the lakes driven by seasonal meltwater input. © 2021, The Author(s).
语种	英语
scopus关键词	glacial hydrology; hydrology; ice sheet; ice thickness; meltwater; monsoon; subglacial environment; transmissivity; Article; controlled study; Greenland; hydraulic conductivity; hydrology; ice sheet; laboratory; lake; mathematical model; seasonal variation; surface property; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251403
作者单位	Department of Geosciences, Princeton University, Princeton, NJ, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, United States; Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Lai C.-Y.,Stevens L.A.,Chase D.L.,et al. Hydraulic transmissivity inferred from ice-sheet relaxation following Greenland supraglacial lake drainages[J],2021,12(1).
APA	Lai C.-Y..,Stevens L.A..,Chase D.L..,Creyts T.T..,Behn M.D..,...&Stone H.A..(2021).Hydraulic transmissivity inferred from ice-sheet relaxation following Greenland supraglacial lake drainages.Nature Communications,12(1).
MLA	Lai C.-Y.,et al."Hydraulic transmissivity inferred from ice-sheet relaxation following Greenland supraglacial lake drainages".Nature Communications 12.1(2021).