气候变化领域集成服务门户(CCPortal): A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery

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DOI	10.5194/tc-7-1869-2013
	A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery
	Morriss B.F.; Hawley R.L.; Chipman J.W.; Andrews L.C.; Catania G.A.; Hoffman M.J.; Lüthi M.P.; Neumann T.A.
发表日期	2013
ISSN	19940416
卷号	7 期号:6
英文摘要	The rapid drainage of supraglacial lakes introduces large pulses of meltwater to the subglacial environment and creates moulins, surface-to-bed conduits for future melt. Introduction of water to the subglacial system has been shown to affect ice flow, and modeling suggests that variability in water supply and delivery to the subsurface play an important role in the development of the subglacial hydrologic system and its ability to enhance or mitigate ice flow. We developed a fully automated method for tracking meltwater and rapid drainages in large (> 0.125 km2) perennial lakes and applied it to a 10 yr time series of ETM+ and MODIS imagery of an outlet glacier flow band in West Greenland. Results indicate interannual variability in maximum coverage and spatial evolution of total lake area. We identify 238 rapid drainage events, occurring most often at low (< 900 m) and middle (900-1200 m) elevations during periods of net filling or peak lake coverage. We observe a general progression of both lake filling and draining from lower to higher elevations but note that the timing of filling onset, peak coverage, and dissipation are also variable. Lake coverage is sensitive to air temperature, and warm years exhibit greater variability in both coverage evolution and rapid drainage. Mid-elevation drainages in 2011 coincide with large surface velocity increases at nearby GPS sites, though the relationships between ice-shed-scale dynamics and meltwater input are still unclear. © Author(s) 2013. CC Attribution 3.0 License.
学科领域	algorithm; glacier flow; GPS; ice flow; lake evolution; Landsat thematic mapper; meltwater; MODIS; multispectral image; subglacial environment; Arctic; Greenland; West Greenland
语种	英语
scopus关键词	algorithm; glacier flow; GPS; ice flow; lake evolution; Landsat thematic mapper; meltwater; MODIS; multispectral image; subglacial environment; Arctic; Greenland; West Greenland
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/120229
作者单位	Dartmouth College, Hanover, NH, United States; University of Texas, Austin, TX, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; Swiss Federal Institute, Zürich, Switzerland; NASA Goddard Space Flight Center, Green Belt, MD, United States
推荐引用方式 GB/T 7714	Morriss B.F.,Hawley R.L.,Chipman J.W.,et al. A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery[J],2013,7(6).
APA	Morriss B.F..,Hawley R.L..,Chipman J.W..,Andrews L.C..,Catania G.A..,...&Neumann T.A..(2013).A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery.Cryosphere,7(6).
MLA	Morriss B.F.,et al."A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery".Cryosphere 7.6(2013).