Elevated geothermal surface heat flow in the Amundsen Sea Embayment, West Antarctica
Elevated geothermal surface heat flow in the Amundsen Sea Embayment, West Antarctica
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DOI：
10.1016/j.epsl.2018.11.003
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发表时间：
2019-01
影响因子：
5.3
通讯作者：
R. Dziadek;K. Gohl;N. Kaul
中科院分区：
文献类型：
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作者：
R. Dziadek;K. Gohl;N. Kaul
极地大陆地壳的热状态对于了解大冰盖的稳定性和厚度、大冰盖融化时卸载引起的固体地球粘弹性响应以及未来海平面上升预测的准确性起着至关重要的作用。各种研究表明，需要精确测量和估计南极洲的地热热流（GHF），以获得更好的约束边界条件，以提高冰盖模型的性能。本研究通过大陆架沉积物的原位温度测量，为阿蒙森海海湾（西南极裂谷系统的一部分）的区域间接 GHF 估计提供了基础事实。我们的结果显示阿蒙森海海湾区域性升高且不均匀的 GHF（平均值为 65 mW m−2）。考虑到由温暖的水流入和沉积过程引起的热覆盖效应，估计的 GHF 范围在 65 mW m−2 和 95 mW m−2 之间。
The thermal state of polar continental crust plays a crucial role for understanding the stability and thickness of large ice sheets, the visco-elastic response of the solid Earth due to unloading when large ice caps melt and, in turn, the accuracy of future sea-level rise prediction. Various studies demonstrate the need for precise measurements and estimation of geothermal heat flow (GHF) in Antarctica for better constrained boundary conditions to enhance the ice sheet model performance. This study provides ground-truth for regional indirect GHF estimates in the Amundsen Sea Embayment, which is part of the West Antarctic Rift System, by presenting in situ temperature measurements in continental shelf sediments. Our results show regionally elevated and heterogeneous GHF (mean of 65 mW m−2) in the Amundsen Sea Embayment. Considering thermal blanketing effects, induced by inflow of warmer water and sedimentary processes, the estimated GHF ranges between 65 mW m−2and 95 mW m−2.