Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing.
Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing.
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DOI：
10.1126/sciadv.abe7136
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发表时间：
2021-05
期刊：
影响因子：
13.6
通讯作者：
Young TJ
中科院分区：
文献类型：
--
作者：
Law R;Christoffersen P;Hubbard B;Doyle SH;Chudley TR;Schoonman CM;Bougamont M;des Tombe B;Schilperoort B;Kechavarzi C;Booth A;Young TJ
从1043米深的钻孔高分辨率观测显示高度可变的冰的属性和不均匀的变形。冰温度的测量提供了对冰粘度和冰川内发生的热力学过程的关键约束。然而，这种测量目前受到少数相对粗糙的空间分辨率钻孔记录的限制，特别是对于冰盖。在这里，我们推进我们的冰川热力学的理解与一个非常高的垂直分辨率（~0.65米），分布式光纤温度传感配置文件从1043米的钻孔钻到基地的Sermeq Kujalleq（商店冰川），格陵兰岛。我们报告了大量的，但孤立的应变加热在208至242米深的间冰期冰与强烈的非均匀冰变形在889米以下的冰期冰。我们还观察到冰川和间冰期冰和73米厚的温带基底层之间的高应变界面，解释为当地形成的冰川的快速运动和重要的。这些研究结果表明显着的空间异质性，无论是在垂直和集水区规模，在促进格陵兰海洋终止冰川的快速运动的条件。
High-resolution observations from a 1043-m-deep borehole show highly variable ice properties and heterogeneous deformation. Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we advance our understanding of glacier thermodynamics with an exceptionally high-vertical-resolution (~0.65 m), distributed-fiber-optic temperature-sensing profile from a 1043-m borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland. We report substantial but isolated strain heating within interglacial-phase ice at 208 to 242 m depth together with strongly heterogeneous ice deformation in glacial-phase ice below 889 m. We also observe a high-strain interface between glacial- and interglacial-phase ice and a 73-m-thick temperate basal layer, interpreted as locally formed and important for the glacier’s fast motion. These findings demonstrate notable spatial heterogeneity, both vertically and at the catchment scale, in the conditions facilitating the fast motion of marine-terminating glaciers in Greenland.
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DOI：
10.1029/jb094ib08p10355
发表时间：
1989-08-10
期刊：
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS
影响因子：
--
作者：
DAHLJENSEN, D
通讯作者：
DAHLJENSEN, D
影响因子：
9.5
作者：
Goelzer, Heiko;Robinson, Alexander;van de Wal, Roderik S. W.
通讯作者：
van de Wal, Roderik S. W.
影响因子：
16.6
作者：
Bons PD;Jansen D;Mundel F;Bauer CC;Binder T;Eisen O;Jessell MW;Llorens MG;Steinbach F;Steinhage D;Weikusat I
通讯作者：
Weikusat I
影响因子：
2.9
作者：
Harrington, Joel A.;Humphrey, Neil F.;Harper, Joel T.
通讯作者：
Harper, Joel T.
影响因子：
5.4
作者：
Caissie, Daniel;Luce, Charles H.
通讯作者：
Luce, Charles H.