An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model
复制标题
利用二维一阶流带冰流模型研究中国西部祁连山老虎沟12号冰川的热力特征
DOI：
10.5194/tc-12-851-2018
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发表时间：
2016-03
期刊：
影响因子：
5.2
通讯作者：
Qin Dahe
中科院分区：
文献类型：
--
作者：
Wang Yuzhe;Zhang Tong;Ren Jiawen;Qin Xiang;Liu Yushuo;Sun Weijun;Chen Jizu;Ding Minghu;Du Wentao;Qin Dahe
本文结合现场观测和二维热力耦合冰流模型，对祁连山最大的河谷冰川（老虎沟12号冰川; LHG 12）的热力学特征进行了研究。我们的模型结果表明，LHG 12，以前被认为是完全冷的，可能是多温的，与较低的温带冰层覆盖的上层冷冰在一个大区域的消融区。模拟的冰面速度与东分支（主分支）的原位观测结果吻合良好，但明显低估了冰川终点附近的速度，这可能是因为忽略了汇流，低估了汇流区下方的基底滑动。模拟的冰温与上消融区深钻孔（110深）的原位测量结果非常一致。模型结果对地表热边界条件，如地表气温和近地表冰温敏感。在这项研究中，我们使用的狄利克雷地面热条件的约束下，20钻孔温度和年表面空气温度。像许多其他高山冰川一样，应变加热在控制LHG 12的冰内热结构方面很重要。我们的瞬态模拟表明，在过去的二十年中，作为对升高的平衡线高度和夏季气温上升的响应，积聚区变得更冷。我们认为，LHG 12的积聚盆地的程度（从融水的再冻结潜热的量）的冰内热状态有相当大的影响。
By combining in situ measurements and a two-dimensional thermomechanically coupled ice flow model, we investigate the thermomechanical features of the largest valley glacier (Laohugou Glacier No. 12; LHG12) on Qilian Shan located in the arid region of western China. Our model results suggest that LHG12, previously considered as fully cold, is probably polythermal, with a lower temperate ice layer overlain by an upper layer of cold ice over a large region of the ablation area. Modelled ice surface velocities match well with the in situ observations in the east branch (main branch) but clearly underestimate those near the glacier terminus, possibly because the convergent flow is ignored and the basal sliding beneath the confluence area is underestimated. The modelled ice temperatures are in very good agreement with the in situ measurements from a deep borehole (110deep) in the upper ablation area. The model results are sensitive to surface thermal boundary conditions, for example surface air temperature and near-surface ice temperature. In this study, we use a Dirichlet surface thermal condition constrained by 20borehole temperatures and annual surface air temperatures. Like many other alpine glaciers, strain heating is important in controlling the englacial thermal structure of LHG12. Our transient simulations indicate that the accumulation zone becomes colder during the last two decades as a response to the elevated equilibrium line altitude and the rising summer air temperatures. We suggest that the extent of accumulation basin (the amount of refreezing latent heat from meltwater) of LHG12 has a considerable impact on the englacial thermal status.
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2009年夏季中国西祁连山老虎沟12号冰川积聚区地表能量收支
影响因子：
2
作者：
Sun, Weijun;Qin, Xiang;Ren, Jiawen;Yang, Xingguo;Zhang, Tong;Liu, Yushuo;Cui, Xiaoqing;Du, Wentao
通讯作者：
Du, Wentao
影响因子：
3.4
作者：
Maohuan Huang
通讯作者：
Maohuan Huang
影响因子：
3.4
作者：
Tong Zhang;L. Ju;W. Leng;S. Price;M. Gunzburger
通讯作者：
Tong Zhang;L. Ju;W. Leng;S. Price;M. Gunzburger
DOI：
10.2307/1551118
发表时间：
1981-01
期刊：
Arctic and alpine research
影响因子：
--
作者：
R. Armstrong;W. Paterson
通讯作者：
R. Armstrong;W. Paterson
影响因子：
3.4
作者：
Maohuan Huang;Zhongxiang Wang;Jiawen Ren
通讯作者：
Maohuan Huang;Zhongxiang Wang;Jiawen Ren