DOI: 10.5194/tc-7-1869-2013
Scopus记录号: 2-s2.0-84890476991
论文题名: A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery
作者: Morriss B ; F ; , Hawley R ; L ; , Chipman J ; W ; , Andrews L ; C ; , Catania G ; A ; , Hoffman M ; J ; , Lüthi M ; P ; , Neumann T ; A
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 6 起始页码: 1869
结束页码: 1877
语种: 英语
英文关键词: algorithm
; glacier flow
; GPS
; ice flow
; lake evolution
; Landsat thematic mapper
; meltwater
; MODIS
; multispectral image
; subglacial environment
; Arctic
; Greenland
; West Greenland
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74919
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Morriss B,F,, Hawley R,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]. Cryosphere,2013-01-01,7(6)