DOI: 10.1002/2014GL061635
论文题名: Surface slope control on firn density at Thwaites Glacier, West Antarctica: Results from airborne radar sounding
作者: Grima C. ; Blankenship D.D. ; Young D.A. ; Schroeder D.M.
刊名: Geophysical Research Letters
ISSN: 0094-9725
EISSN: 1944-9456
出版年: 2014
卷: 41, 期: 19 起始页码: 6787
结束页码: 6794
语种: 英语
英文关键词: ice sheet
; properties
; remote sensing
; snow
; surface mass balance
Scopus关键词: Climate models
; Radar
; Remote sensing
; Snow
; Surface analysis
; Antarctic climate
; Density anomalies
; Glacier dynamics
; Ice sheet
; Inversion techniques
; properties
; Snow redistributions
; Surface mass balance
; Planetary surface analysis
; airborne sensing
; climate modeling
; coastal zone
; density
; firn
; freezing
; mass balance
; snow cover
; snowmelt
; Antarctica
; Thwaites Glacier
; West Antarctica
英文摘要: We derive the surface density variations over Thwaites Glacier from a statistical analysis of airborne High-Capability Radar Sounder surface returns acquired in the 2004-2005 summer. We produce a 5 km gridded map with an estimated ±12.5 kg m-3 accuracy. The background pattern of densities decreases inland from ~ 480 kg m-3 to ~ 350 kg m-3. A remarkable ~ 30 km wide vein-shaped anomaly of up to 570 kg m-3 is located ~ 100 km from the coastline. Density anomalies correspond with surface slope breaks but are not necessarily coincident with smaller slopes. They could result from complex wind-driven snow redistribution and/or refreezing of former snowmelt. This inversion technique can significantly improve surface mass balance calculations to understanding of glacier dynamics at regional scales and is valuable to verify and improve Antarctic climate models. It is also a promising approach for future surface analysis of icy moons by planetary radars. Key Points Surface density of Thwaites Glacier is mapped using airborne radar sounding dataA vein-shaped anomaly is detected parallel to the coastline 100 km inlandSurface density pattern is heterogeneous and controlled by surface slope breaks ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911192194&doi=10.1002%2f2014GL061635&partnerID=40&md5=d2246520e99fe0fa653a1d287676b1da
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6989
Appears in Collections: 气候减缓与适应
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作者单位: Institute for Geophysics, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Grima C.,Blankenship D.D.,Young D.A.,et al. Surface slope control on firn density at Thwaites Glacier, West Antarctica: Results from airborne radar sounding[J]. Geophysical Research Letters,2014-01-01,41(19).