Integrating satellite observations with modelling: basal shear stress of the Filcher-Ronne ice streams, Antarctica
Integrating satellite observations with modelling: basal shear stress of the Filcher-Ronne ice streams, Antarctica
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将卫星观测与建模相结合：南极洲 Filcher-Ronne 冰流的基础剪切应力
DOI：
10.1098/rsta.2006.1799
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
D. Macayeal
中科院分区：
文献类型：
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作者：
I. Joughin;J. Bamber;T. Scambos;S. Tulaczyk;M. Fahnestock;D. Macayeal
使用逆方法约束最近的卫星观测，我们已经产生了一个全面的估计的基础剪切应力下的Filchner-Ronne冰流。反演表明，弱床（约。4 - 20千帕）是这些冰流的基础。 与罗斯冰流相比，弱冰下冰碛的分布更不均匀，“粘性点”提供了很大的流动阻力。复苏冰流下面的一个脆弱的河床向内陆延伸了几百公里。沿着这条冰流，厚度测量值和流量估计值之间的差异表明存在一个深（-1400米）的槽，现有的冰下地形图没有解决这个问题。 我们假设，这个和其他深槽的存在是一个重大的影响，这一部门的冰盖，是没有完全纳入目前的模型冰盖演变。
Using inverse methods constrained by recent satellite observations, we have produced a comprehensive estimate of the basal shear stress beneath the Filchner-Ronne ice streams. The inversions indicate that a weak bed (approx. 4–20 kPa) underlies much of these ice streams. Compared to the Ross ice streams, the distribution of weak subglacial till is more heterogeneous, with ‘sticky spots’ providing much of the resistance to flow. A weak bed beneath Recovery ice stream extends several hundred kilometres inland with flow. Along this ice stream, discrepancies between thickness measurements and flux estimates suggest the existence of a deep (−1400 m) trough not resolved by existing maps of subglacial topography. We hypothesize that the presence of this and other deep troughs is a major influence on this sector of the ice sheet that is not fully incorporated in current models of ice-sheet evolution.