Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet
Subglacial topography and geothermal heat flux: Potential interactions with drainage of the Greenland ice sheet
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冰下地形和地热热通量：与格陵兰冰盖排水的潜在相互作用
DOI：
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发表时间：
2007
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影响因子：
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通讯作者：
J. Li
中科院分区：
文献类型：
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作者：
C. J. van der Veen;T. Leftwich;R. von Frese;B. Csathó;J. Li
格陵兰岛的许多出口冰川覆盖着深深的狭窄沟槽，这些沟槽切入基岩。众所周知，明显的地形会加强深谷中的地热通量，并减弱山区的地热通量。在这里，我们调查了格陵兰岛两个冰下海沟的这种影响的大小。利用Lachenbruch（1968）导出的平面斜率解，对理想几何形状的热通量变化进行了估算。研究发现，对于像雅各布港-伊斯布雷加斯这样的通道，地形效应可能会使当地的地热通量增加100%。
Many of the outlet glaciers in Greenland overlie deep and narrow trenches cut into the bedrock. It is well known that pronounced topography intensifies the geothermal heat flux in deep valleys and attenuates this flux on mountains. Here we investigate the magnitude of this effect for two subglacial trenches in Greenland. Heat flux variations are estimated for idealized geometries using solutions for plane slopes derived by Lachenbruch (1968). It is found that for channels such as the one under Jakobshavn Isbræ, topographic effects may increase the local geothermal heat flux by as much as 100%.