气候变化领域集成服务门户(CCPortal): Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry

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DOI	10.5194/tc-9-2219-2015
	Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry
	Allstadt K.E.; Shean D.E.; Campbell A.; Fahnestock M.; Malone S.D.
发表日期	2015
ISSN	19940416
卷号	9 期号:6
英文摘要	We present surface velocity maps derived from repeat terrestrial radar interferometry (TRI) measurements and use these time series to examine seasonal and diurnal dynamics of alpine glaciers at Mount Rainier, Washington. We show that the Nisqually and Emmons glaciers have small slope-parallel velocities near the summit (< 0.2 m day-1), high velocities over their upper and central regions (1.0-1.5 m day-1), and stagnant debris-covered regions near the terminus (< 0.05 m day-1). Velocity uncertainties are as low as ±0.02-0.08 m day-1. We document a large seasonal velocity decrease of 0.2-0.7 m day-1 (−25 to −50 %) from July to November for most of the Nisqually Glacier, excluding the icefall, suggesting significant seasonal subglacial water storage under most of the glacier. We did not detect diurnal variability above the noise level. Simple 2-D ice flow modeling using TRI velocities suggests that sliding accounts for 91 and 99 % of the July velocity field for the Emmons and Nisqually glaciers with possible ranges of 60-97 and 93-99.5 %, respectively, when considering model uncertainty. We validate our observations against recent in situ velocity measurements and examine the long-term evolution of Nisqually Glacier dynamics through comparisons with historical velocity data. This study shows that repeat TRI measurements with > 10 km range can be used to investigate spatial and temporal variability of alpine glacier dynamics over large areas, including hazardous and inaccessible areas. © 2015 Author(s).
学科领域	alpine environment; glacier dynamics; radar interferometry; seasonality; slope dynamics; spatiotemporal analysis; subglacial environment; terrestrial environment; two-dimensional flow; uncertainty analysis; water storage; Cascade Range; Mount Rainier; United States; Washington [United States]
语种	英语
scopus关键词	alpine environment; glacier dynamics; radar interferometry; seasonality; slope dynamics; spatiotemporal analysis; subglacial environment; terrestrial environment; two-dimensional flow; uncertainty analysis; water storage; Cascade Range; Mount Rainier; United States; Washington [United States]
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/119777
作者单位	University of Washington, Department of Earth and Space Sciences, Washington, United States; University of Washington, Applied Physics Lab Polar Science Center, Washington, United States; University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AL, United States; USGS Geologic Hazards Science Center, Golden, CO, United States
推荐引用方式 GB/T 7714	Allstadt K.E.,Shean D.E.,Campbell A.,et al. Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry[J],2015,9(6).
APA	Allstadt K.E.,Shean D.E.,Campbell A.,Fahnestock M.,&Malone S.D..(2015).Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry.Cryosphere,9(6).
MLA	Allstadt K.E.,et al."Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry".Cryosphere 9.6(2015).