DOI: 10.5194/tc-9-2219-2015
Scopus记录号: 2-s2.0-84948983408
论文题名: Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry
作者: Allstadt K ; E ; , Shean D ; E ; , Campbell A ; , Fahnestock M ; , Malone S ; D
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 6 起始页码: 2219
结束页码: 2235
语种: 英语
英文关键词: 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]
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75220
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: 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
Recommended Citation:
Allstadt K,E,, Shean D,et al. Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry[J]. Cryosphere,2015-01-01,9(6)