气候变化领域集成服务门户(CCPortal): 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

CCPortal

DOI	10.5194/tc-12-851-2018
	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
	Wang Y.; Zhang T.; Ren J.; Qin X.; Liu Y.; Sun W.; Chen J.; Ding M.; Du W.; Qin D.
发表日期	2018
ISSN	19940416
卷号	12 期号:3
英文摘要	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 (110 m deep) 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 20 m borehole 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. © 2018 Author(s).
学科领域	air temperature; arid region; borehole; confluence; equilibrium line; heating; ice flow; in situ measurement; temperature effect; thermal structure; thermomechanics; two-dimensional flow; valley glacier; China; Laohugou Glacier; Qilian Mountains; Xinjiang Uygur
语种	英语
scopus关键词	air temperature; arid region; borehole; confluence; equilibrium line; heating; ice flow; in situ measurement; temperature effect; thermal structure; thermomechanics; two-dimensional flow; valley glacier; China; Laohugou Glacier; Qilian Mountains; Xinjiang Uygur
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119204
作者单位	State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese, Academy of Sciences, Beijing, 100049, China; Institute of Polar Meteorology, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; College of Geography and Environment, Shandong Normal University, Jinan, 250014, China; Fluid Dynamics and Solid Mechanics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
推荐引用方式 GB/T 7714	Wang Y.,Zhang T.,Ren J.,et al. 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[J],2018,12(3).
APA	Wang Y..,Zhang T..,Ren J..,Qin X..,Liu Y..,...&Qin D..(2018).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.Cryosphere,12(3).
MLA	Wang Y.,et al."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".Cryosphere 12.3(2018).