Evidence for variable grounding-zone and shear-margin basal conditions across Thwaites Glacier, West Antarctica
Evidence for variable grounding-zone and shear-margin basal conditions across Thwaites Glacier, West Antarctica
复制标题
西南极洲思韦茨冰川可变接地区和剪切边缘基础条件的证据
DOI:
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
D. Blankenship
中科院分区:
文献类型:
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作者:
D. Schroeder;C. Grima;D. Blankenship
ABSTRACTDefinitive interpretation of ice-sheet basal conditions from radar-sounding data beneath outlet-glacier grounding zones and shear margins can be problematic due to poorly constrained and spatially variable englacial attenuation rates and losses from propagation through a rough ice surface. To correct for spatially variable attenuation rates, we developed a novel radar analysis approach that provided improved empirical attenuation correction by fitting linearly variable attenuation rates along radar-sounding profiles from the ice-sheet interior to the grounding zone. We also corrected for ice-surface propagation losses by using surface echo amplitude distributions to constrain the loss of coherent power for surface reflections and two-way propagation through a rough ice surface. By applying this approach to airborne radar-sounding observations of the Thwaites Glacier catchment in West Antarctica, we produced relative reflectivity profiles, which show grounding-zone basal conditions varying across t...
DOI:
10.5194/tc-4-447-2010
发表时间:
2010
期刊:
The Cryosphere
影响因子:
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作者:
Jacobel R
通讯作者:
Jacobel R
影响因子:
18.3
作者:
Greenbaum, J. S.;Blankenship, D. D.;Siegert, M. J.
通讯作者:
Siegert, M. J.
影响因子:
5.2
作者:
Gudmundsson, G. H.;Krug, J.;Gagliardini, O.
通讯作者:
Gagliardini, O.