Deriving Melt Rates at a Complex Ice Shelf Base Using In Situ Radar: Application to Totten Ice Shelf

Deriving Melt Rates at a Complex Ice Shelf Base Using In Situ Radar: Application to Totten Ice Shelf
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使用原位雷达推导复杂冰架底部的融化速率:在托滕冰架上的应用

DOI:
10.1029/2021gl092692
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发表时间:
2021
影响因子:
5.2
通讯作者:
B. Galton
B. Galton
中科院分区:
地球科学1区
文献类型:
--
作者:
Irena Vaňková;Sue Cook;J. P. Winberry;K. Nicholls;B. Galton

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在Totten冰架上部署了一台相敏雷达(APRES),以提供这一动态东南极冰架的第一次现场基融估计。在潮汐时间尺度上对内部冰动力学的观察表明,从最低端反射器早期到达的冰盖掩盖了冰架底部的真实深度。利用观测到的潮汐形变,发现真正的基座位于1910-1950米深,比冰-海洋界面的第一次反射距离大350-400米。通过在雷达足迹上使用多次基本反射,增强了基本融化速率估计的稳健性,得到22±2.1m a−1的融化速率。APRES估计比覆盖托顿冰架的三个现有卫星估计低40%以上。基础熔体的这种差异在动态上是显着的,并突显了使用基于不同假设集的补充仪器和技术来独立估计熔体速率的必要性。
A phase‐sensitive radar (ApRES) was deployed on Totten Ice Shelf to provide the first in situ basal melt estimate at this dynamic East Antarctic ice shelf. Observations of internal ice dynamics at tidal time scales showed that early arrivals from off‐nadir reflectors obscure the true depth of the ice shelf base. Using the observed tidal deformation, the true base was found to lie at 1,910–1,950‐m depth, at 350–400 m greater range than the first reflection from an ice‐ocean interface. The robustness of the basal melt rate estimate was increased by using multiple basal reflections over the radar footprint, yielding a melt rate of 22 ± 2.1 m a−1. The ApRES estimate is over 40% lower than the three existing satellite estimates covering Totten Ice Shelf. This difference in basal melt is dynamically significant and highlights the need for independent melt rate estimates using complementary instrumentation and techniques that rely on different sets of assumptions.
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