气候变化领域集成服务门户(CCPortal): Cosmogenic Be-10 surface exposure dating and glacier reconstruction for the Last Glacial Maximum in the Quemuqu Valley, western Nyainqentanglha Mountains, south Tibet

CCPortal

DOI	10.1002/jqs.2963
	Cosmogenic Be-10 surface exposure dating and glacier reconstruction for the Last Glacial Maximum in the Quemuqu Valley, western Nyainqentanglha Mountains, south Tibet
	Dong, Guocheng; Xu, Xiangke; Zhou, Weijian; Fu, Yunchong; Zhang, Li; Li, Ming
通讯作者	Dong, GC (通讯作者)
发表日期	2017
ISSN	0267-8179
EISSN	1099-1417
起始页码	639
结束页码	652
卷号	32 期号:5
英文摘要	The nature and timing of glaciations enable inferences to be made about glacial climates. However, the paucity of reliable glacial chronologies impedes a full understanding of the Last Glacial Maximum (LGM) climate in the western Nyainqentanglha Mountains, south Tibet. In this study, we investigated the LGM glacial history in the Quemuqu Valley, western Nyainqentanglha, using Be-10 surface exposure dating. We used a physically based glacier model to reconstruct the LGM glacial surfaces, and estimated the LGM equilibrium-line-altitude (ELA) using integrated methods. Combined with previously published Be-10 exposure ages from the western Nyainqentanglha, ten Be-10 exposure ages imply a relatively restricted glacial extent in the LGM but extensive growth in the early last glacial. The modeled LGM glaciers had ice areas of approximate to 36.3km(2), 3.21km(3) in volume and 89mm in average thickness in the Quemuqu Valley. The reconstructed LGM ELAs have values of 5463-5583masl, with a depression of approximate to 244-364m. By combining the reconstructed ELAs with an equation deduced from glacier mass balance, we concluded that the temperature dropped by approximate to 2.6-4.6 degrees C in the LGM relative to the present, with 30-70% lower precipitation than the present. Global cooling induced the LGM glacial advance in the western Nyainqentanglha despite decreased precipitation.
关键词	EQUILIBRIUM-LINE ALTITUDES LATE QUATERNARY GLACIATION NUCLIDE PRODUCTION-RATES IBERIAN CENTRAL SYSTEM ICE-AGE TASHKURGAN VALLEY MASS-BALANCE NEW-ZEALAND PLATEAU CLIMATE
英文关键词	Be-10 surface exposure dating; equilibrium line altitude; glacier reconstruction; Last Glacial Maximum; Nyainqentanglha
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000405801900008
来源期刊	JOURNAL OF QUATERNARY SCIENCE
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/258970
推荐引用方式 GB/T 7714	Dong, Guocheng,Xu, Xiangke,Zhou, Weijian,et al. Cosmogenic Be-10 surface exposure dating and glacier reconstruction for the Last Glacial Maximum in the Quemuqu Valley, western Nyainqentanglha Mountains, south Tibet[J]. 中国科学院青藏高原研究所,2017,32(5).
APA	Dong, Guocheng,Xu, Xiangke,Zhou, Weijian,Fu, Yunchong,Zhang, Li,&Li, Ming.(2017).Cosmogenic Be-10 surface exposure dating and glacier reconstruction for the Last Glacial Maximum in the Quemuqu Valley, western Nyainqentanglha Mountains, south Tibet.JOURNAL OF QUATERNARY SCIENCE,32(5).
MLA	Dong, Guocheng,et al."Cosmogenic Be-10 surface exposure dating and glacier reconstruction for the Last Glacial Maximum in the Quemuqu Valley, western Nyainqentanglha Mountains, south Tibet".JOURNAL OF QUATERNARY SCIENCE 32.5(2017).