Bathymetry Beneath the Amery Ice Shelf, East Antarctica, Revealed by Airborne Gravity
Bathymetry Beneath the Amery Ice Shelf, East Antarctica, Revealed by Airborne Gravity
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DOI：
10.1029/2021gl096215
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发表时间：
2021-12
影响因子：
5.2
通讯作者：
Junjun Yang;Jingxue Guo;J. Greenbaum;X. Cui;L. Tu;Lin Li;Lenneke M. Jong;Xueyuan Tang;
中科院分区：
文献类型：
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作者：
Junjun Yang;Jingxue Guo;J. Greenbaum;X. Cui;L. Tu;Lin Li;Lenneke M. Jong;Xueyuan Tang;
Amery冰架下的水深测量控制着洋流输送海洋热量的流动，因此是精确模拟冰-海洋相互作用的先决条件。然而，由于受到厚冰的阻碍，对冰架下水深的直接观测很少，限制了我们量化该部门演变及其未来对全球平均海平面上升的贡献的能力。利用模拟退火算法对该地区的航空重力异常进行了水深估计。与目前的模型显示的冰解前缘下方的海底相对平坦不同，我们的估计结果显示西侧有一个255米深的浅滩，东侧有一个1，050米深的槽，这是控制海洋热量输送到冰下空腔的重要地形特征。新模型还揭示了以前未知的凹陷和门槛，这对于改进冰架下海洋环流和诱导基底融化的建模至关重要。
The bathymetry under the Amery Ice Shelf steers the flow of ocean currents transporting ocean heat, and thus is a prerequisite for precise modeling of ice‐ocean interactions. However, hampered by thick ice, direct observations of sub‐ice‐shelf bathymetry are rare, limiting our ability to quantify the evolution of this sector and its future contribution to global mean sea level rise. We estimated the bathymetry of this region from airborne gravity anomaly using simulated annealing. Unlike the current model which shows a comparatively flat seafloor beneath the calving front, our estimation results reveal a 255‐m‐deep shoal at the western side and a 1,050‐m‐deep trough at the eastern side, which are important topographic features controlling the ocean heat transport into the sub‐ice cavity. The new model also reveals previously unknown depressions and sills that are critical to an improved modeling of the sub‐ice‐shelf ocean circulation and induced basal melting.