A Geothermal Heat Flux Map of Antarctica Empirically Constrained by Seismic Structure
A Geothermal Heat Flux Map of Antarctica Empirically Constrained by Seismic Structure
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DOI：
10.1029/2020gl086955
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
W. Shen;D. Wiens;A. Lloyd;A. Nyblade
中科院分区：
文献类型：
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作者：
W. Shen;D. Wiens;A. Lloyd;A. Nyblade
地热通量（GHF）是模拟南极冰盖运动的重要边界条件，但很难在大陆尺度上进行系统测量。早期的GHF图分辨率低，对构造作用和地壳生热的假设可能有偏差，导致很大的不确定性。我们提出了一个新的GHF地图，南极洲建造的经验有关的上地幔结构，已知的GHF在美国大陆。新地图与以前的地震学确定的地图相比，分辨率提高了，不确定性降低了。这张地图的新特征包括南跨南极山脉的高GHF，那里的岩石圈移除和思韦茨冰川地区引入了温暖的最上层地幔。此外，在西南极裂谷系统中部靠近西普尔海岸的地方，发现了一个中等的GHF，并且没有GHF大于90 mW/m2的大规模区域。
The geothermal heat flux (GHF) is an important boundary condition for modeling the movement of the Antarctic ice sheet but is difficult to measure systematically at a continental scale. Earlier GHF maps suffer from low resolution and possibly biased assumptions in tectonism and crustal heat generation, resulting in significant uncertainty. We present a new GHF map for Antarctica constructed by empirically relating the upper mantle structure to known GHF in the continental United States. The new map, compared with previously seismologically determined one, has improved resolution and lower uncertainties. New features in this map include high GHF in the southern Transantarctic Mountains where warmer uppermost mantle is introduced by lithospheric removal and in the Thwaites Glacier region. Additionally, a modest GHF in the central West Antarctic Rift system near the Siple Coast and an absence of large‐scale regions with GHF greater than 90 mW/m2 are found.