气候变化领域集成服务门户(CCPortal): Glacier change in the Gangdise Mountains, southern Tibet, since the Little Ice Age

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DOI	10.1016/j.geomorph.2018.01.002
	Glacier change in the Gangdise Mountains, southern Tibet, since the Little Ice Age
	Zhang, Qian; Yi, Chaolu; Fu, Ping; Wu, Yubin; Liu, Jinhua; Wang, Ninglian
通讯作者	Yi, CL (通讯作者)
发表日期	2018
ISSN	0169-555X
EISSN	1872-695X
起始页码	51
结束页码	63
卷号	306
英文摘要	Delineating glacier change during the Little Ice Age (LIA) is of great importance when attempting to understand regional climatic changes and can also help to improve the understanding of any predictions of future glacial changes. However, such knowledge is still lacking for some critical regions of the Tibetan Plateau (TP). In this study, we mapped 4188 contemporary glaciers and reconstructed 1216 LIA areas of glacial coverage in the Gangdise Mountains to the north of the Himalaya using Google Earth satellite imagery. We estimated their paleoglacial areas and equilibrium line altitudes (ELAs) based on the toe-to-headwall altitude ratio (THAR) method. Results show that most glaciers are small (<1 km(2)), with slope/hanging glaciers the most common (2844 out of 4188 glaciers), while valley glaciers have the greatest coverage (1009.0 km(2) out of a total area of 1723.7 km(2)). Contemporary glaciers have retreated significantly since the LIA, with reductions in length of between 5.5% and 94.7% (mean glacier length 696 m; mean reduction in length 41.7%) and reductions in glacier area of between 4.1% and 94.9% (mean glacier area 0.42 km(2); mean reduction in area 44.8%). These reductions have occurred under different local climatic and topographic conditions. The contemporary ELA ranges from 5516 to 6337 m asl; the LIA ELA ranged from 5476 to 6329 m asl. Contemporary and LIA ELA values rise from southeast to northwest. As a general rule, the rise in the ELA value decreases from the eastern to the central Gangdise Mountains and then increases westward, with a mean ELA rise of 45 m. Multiple regression models suggest that 46.8% of the glacier area loss can be explained by glacier elevation, area, and slope. However, only 15.5% of the rise in ELA values can be explained by glacial geometric, topographic, or locational parameters. The spatial pattern of modern ELA values in this region appears inversely related to precipitation, which decreases from southeast to northwest, implying that precipitation is one of the key controls of ELAs. This is also consistent with results from elsewhere in High Asia. In contrast to the Gangdise Mountains' eastern and western sectors, glaciers in the central sector have undergone less change, i.e., in terms of reductions in length, area loss, and rises in ELA. Topography can of course also influence glacial change by creating shielding and/or rainshadow effects and by affecting local temperatures. (C) 2018 Elsevier B.V. All rights reserved.
关键词	BE-10 SURFACE EXPOSURE CLIMATE-CHANGE TIAN-SHAN PLATEAU UPLIFT AREA TEMPERATURE MILLENNIUM ASYMMETRY INVENTORY
英文关键词	Glacier change; Little Ice Age; Indian Monsoon; Gangdise Mountains
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000427344100005
来源期刊	GEOMORPHOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259284
推荐引用方式 GB/T 7714	Zhang, Qian,Yi, Chaolu,Fu, Ping,et al. Glacier change in the Gangdise Mountains, southern Tibet, since the Little Ice Age[J]. 中国科学院青藏高原研究所,2018,306.
APA	Zhang, Qian,Yi, Chaolu,Fu, Ping,Wu, Yubin,Liu, Jinhua,&Wang, Ninglian.(2018).Glacier change in the Gangdise Mountains, southern Tibet, since the Little Ice Age.GEOMORPHOLOGY,306.
MLA	Zhang, Qian,et al."Glacier change in the Gangdise Mountains, southern Tibet, since the Little Ice Age".GEOMORPHOLOGY 306(2018).