Multisystem Synthesis of Radar Sounding Observations of the Amundsen Sea Sector From the 2004-2005 Field Season.
Multisystem Synthesis of Radar Sounding Observations of the Amundsen Sea Sector From the 2004-2005 Field Season.
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DOI：
10.1029/2021jf006296
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发表时间：
2021-10
影响因子：
3.9
通讯作者：
Vaughan, David G.
中科院分区：
文献类型：
--
作者：
Chu, Winnie;Hilger, Andrew M.;Culberg, Riley;Schroeder, Dustin M.;Jordan, Thomas M.;Seroussi, Helene;Young, Duncan A.;Blankenship, Donald D.;Vaughan, David G.
南极洲西部冰盖的阿蒙森海湾包含思韦茨冰川和松岛冰川，这是南极洲变化最快的两个冰川。迄今为止，松岛和思韦茨冰川只通过独立的机载雷达探测测量进行了观测，但尚未进行联合跨流域分析，调查松岛-思韦茨冰川边界的基础条件。在这里，我们联合收割机两个雷达调查和纠正他们的系统参数的差异，以产生统一的冰川衰减和基础相对反射率图跨越松岛和思韦茨冰川。相对反射率的范围从−24.8到+37.4 dB，最高值出现在冰盖边缘的快速流动的冰层下方。通过将我们的反射率结果与先前推导出的雷达镜面反射率和Thwaites冰川的拖尾床回波进行比较，我们发现了高度多样化的冰下景观和水文条件，这些景观和水文条件沿着沿着流演化。总之，这些发现突出了联合机载雷达分析与地面地震和地貌观测的潜力，以了解冰流和出口冰川的河床特性和跨流域相互作用的变化。我们分析了2004/2005年使用不同的探测器对松岛和思韦茨冰川进行的两次同时进行的机载雷达调查。我们制作了松岛和思韦茨冰川的全流域内冰川衰减和基底反射率图。
The Amundsen Sea Embayment of the West Antarctic Ice Sheet contains Thwaites and Pine Island Glaciers, two of the most rapidly changing glaciers in Antarctica. To date, Pine Island and Thwaites Glaciers have only been observed by independent airborne radar sounding surveys, but a combined cross‐basin analysis that investigates the basal conditions across the Pine Island‐Thwaites Glaciers boundary has not been performed. Here, we combine two radar surveys and correct for their differences in system parameters to produce unified englacial attenuation and basal relative reflectivity maps spanning both Pine Island and Thwaites Glaciers. Relative reflectivities range from −24.8 to +37.4 dB with the highest values beneath fast‐flowing ice at the ice sheet margin. By comparing our reflectivity results with previously derived radar specularity and trailing bed echoes at Thwaites Glacier, we find a highly diverse subglacial landscape and hydrologic conditions that evolve along‐flow. Together, these findings highlight the potential for joint airborne radar analysis with ground‐based seismic and geomorphological observations to understand variations in the bed properties and cross‐catchment interactions of ice streams and outlet glaciers. We analyze two simultaneous 2004/2005 airborne radar surveys of Pine Island and Thwaites Glaciers conducted using different sounders We produce catchment‐wide englacial attenuation and basal reflectivity maps for Pine Island and Thwaites Glaciers Radar analysis reveals a critical frozen basal patch that currently separates the two neighboring glaciers