气候变化领域集成服务门户(CCPortal): Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau

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DOI	10.1016/j.palaeo.2015.09.025
	Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau
	Xu, Xiangke; Glasser, Neil F.
通讯作者	Xu, XK (通讯作者)
发表日期	2015
ISSN	0031-0182
EISSN	1872-616X
起始页码	614
结束页码	620
卷号	440
英文摘要	Glaciers respond sensitively to climate change and paleoclimate conditions can be inferred from the geomorphic evidence by reconstructing equilibrium line altitude (ELA) and by modeling glacier mass balance and ice flow. However, such work has not been extensively carried out on the vast Tibetan Plateau, and thus the knowledge of glacier sensitivity to paleoclimate change and paleoglacier volume is still lacking on the plateau. Recent improvements in understanding glacial extent and chronology in the Payuwang Valley, southern Tibetan Plateau, present an opportunity to estimate the paleoclimate conditions during the Last Glacial cycle. Using a coupled mass-balance and ice-flow model, this study tests the glacier sensitivity to ELA change in the Payuwang Valley. By fitting modeled glaciers to the corresponding moraine positions, we reconstruct glacier extents probably occurred at oxygen isotope stage 3 (MIS 3) and Last Glacial Maximum (LGM) in the valley and infer the related climate conditions that could have supported these glacier advances. The glacier sensitivity tests indicate that in the Payuwang Valley, the glaciers responded to centennial-scale shifts in climate. With ELAs below 5600 m asl, the tributary glaciers coalesce into the main valley and expand rapidly there. The model results also show that the Payuwang Valley contained ice volumes of similar to 1.58 x 10(9) m(3) and similar to 1.23 x 10(9) m(3) with EM lowering values of 370 m and 340 m in the MIS 3 and LGM glacial advances, respectively. By examining other independent paleodimatic reconstructions, we conclude that during the MIS 3 glacier advance, the temperature was only 15 degrees C lower or even 0.2 degrees C higher than the period of 2005-2008 with precipitation 40-100% higher than the 2005-2008 amount; and during the LGM glacier advance, the temperature was 3.3-4.4 degrees C lower than the period of 2005-2008 with the precipitation 30-70% lower than the 2005-2008 amount. These estimates add to the knowledge of better understanding the relationship between glacier dynamic and climatic change on the Tibetan Plateau. (C) 2015 Elsevier B.V. All rights reserved.
关键词	LATE QUATERNARY GLACIATION MASS-BALANCE EXPOSURE AGES CLIMATE MOUNTAINS TEMPERATURE VARIABILITY NORTH PRECIPITATION DEPRESSION
英文关键词	Payuwang Valley; Last Glacial Maximum (LGM); Equilibrium line altitude (ELA); Glacier modeling; Paleoclimate
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000366539700047
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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/258450
推荐引用方式 GB/T 7714	Xu, Xiangke,Glasser, Neil F.. Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau[J]. 中国科学院青藏高原研究所,2015,440.
APA	Xu, Xiangke,&Glasser, Neil F..(2015).Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,440.
MLA	Xu, Xiangke,et al."Glacier sensitivity to equilibrium line altitude and reconstruction for the Last Glacial cycle: glacier modeling in the Payuwang Valley, western Nyaicientanggulha Shan, Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 440(2015).