Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes
Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes
复制标题
使用河床回波自适应约束思韦茨冰川流域的雷达衰减和温度
DOI：
10.1017/jog.2016.100
复制
发表时间：
2016
影响因子：
3.4
通讯作者：
D. Young
中科院分区：
文献类型：
--
作者：
D. Schroeder;H. Seroussi;W. Chu;D. Young
摘要冰温是影响冰流变和流动的主要因素。然而，很难在冰川到冰盖的尺度上进行测量。因此，冰盖模型必须对影响海平面预测的冰温和流变学做出假设。如果由于缺乏受观测约束的冰温值，模型不能捕捉到基本过程，这是有问题的。虽然已经利用雷达探测数据利用冰层来限制格陵兰冰盖的温度结构，但这种方法仅限于这些冰层完好无损的地区和深度。为了扩展基于经验雷达的温度估计，我们提出了一种新的技术来估计整个冰柱的冰层衰减率，该方法基于冰层厚度和修正的床层回波功率的相关性对非聚焦雷达床回波进行自适应拟合。我们将这项技术应用于对西南极Thwaites冰川的航空调查，并将结果与数值冰盖模型的温度和衰减率进行比较。我们发现，估计的衰减率重现了整个集水区的模型模式和值，在陡峭的河床地形附近差异最大。
ABSTRACT Englacial temperature is a major control on ice rheology and flow. However, it is difficult to measure at the glacier to ice-sheet scale. As a result, ice-sheet models must make assumptions about englacial temperature and rheology, which affect sea level projections. This is problematic if fundamental processes are not captured by models due to a lack of observationally constrained ice temperature values. Although radar sounding data have been exploited to constrain the temperature structure of the Greenland ice sheet using englacial layers, this approach is limited to areas and depths where these layers exist intact. In order to extend empirical radar-based temperature estimation beyond this limitation, we present a new technique for estimating englacial attenuation rates for the entire ice column using adaptive fitting of unfocused radar bed echoes based on the correlation of ice thickness and corrected bed echo power. We apply this technique to an airborne survey of Thwaites Glacier in West Antarctica and compare the results with temperatures and attenuation rates from a numerical ice-sheet model. We find that the estimated attenuation rates reproduce modelled patterns and values across the catchment with the greatest differences near steeply sloping bed topography.
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DOI：
10.5194/tc-4-447-2010
发表时间：
2010
期刊：
The Cryosphere
影响因子：
--
作者：
Jacobel R
通讯作者：
Jacobel R
影响因子：
--
作者：
A. Wright;D. Young;J. Roberts;D. Schroeder;J. Bamber;J. Dowdeswell;N. Young;A. L. Brocq;R. Wa
通讯作者：
A. Wright;D. Young;J. Roberts;D. Schroeder;J. Bamber;J. Dowdeswell;N. Young;A. L. Brocq;R. Wa
穿冰雷达数据的冰盖范围内冰川衰减框架
DOI：
10.5194/tc-10-1547-2016
发表时间：
2016
期刊：
The Cryosphere
影响因子：
--
作者：
Jordan T
通讯作者：
Jordan T
用于冰川衰减和冰穿透雷达数据的基底反射的冰盖宽框架
DOI：
10.5194/tc-2016-8
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Jordan T
通讯作者：
Jordan T