气候变化领域集成服务门户(CCPortal): Climate changes in the Qaidam Basin in NW China over the past 40 kyr

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DOI	10.1016/j.palaeo.2020.109679
	Climate changes in the Qaidam Basin in NW China over the past 40 kyr
	Zhang M.; Liu X.
发表日期	2020
ISSN	0031-0182
卷号	551
英文摘要	Little is known about the climate and environmental changes that have occurred in the extremely arid regions of China since MIS (Marine Isotope Stage) 3 (59–29 cal kyr BP), when most regions in northwestern China and the Tibetan Plateau featured warm and humid conditions. In this paper, we present a record of the climate changes in the Qaidam Basin in arid northwestern China over the past 40 kyr based on the mineralogy of a 35-m-long sediment core recovered from Qarhan Salt Lake. Our results show that the lake was a saline or hyper-saline lake saturated with respect to gypsum between 40 and 33 cal kyr BP. Beginning at 33 cal kyr BP, evaporite formation was dominated by halite precipitation, indicating that the lake salinity had increased extensively and that the climate became drier during 33–24.5 cal kyr BP. The lake salinity then increased continuously, resulting in the appearance of bischofite between 24.5 and 14.6 cal kyr BP. The disappearance of bischofite and the increase in gypsum indicate that the salinity of the water decreased slightly between 14.6 and 8.3cal kyr BP. However, during the last 8300 years, the lake has dried up and is now a playa. Generally, the climate was wet in late MIS 3, arid in MIS 2 (29–11.7 cal kyr BP), and hyperarid in the Holocene. The relatively humid conditions may have resulted from weak evaporation caused by the relatively low insolation and intense ice-albedo feedback in late MIS 3. The decreased insolation and dramatically increased Eurasian ice volume in MIS 2 may have led to limited precipitation, which resulted in persistent dry climate conditions in the Qaidam Basin. In the Holocene, the reduction in ice volume reduced the albedo, and this change, in conjunction with increased insolation, may have led to evaporation exceeding local precipitation, resulting in hyperarid climate conditions in the Qaidam Basin. © 2020 Elsevier B.V.
英文关键词	Eurasian ice volume; Ice-albedo feedback; Insolation; Mineral assemblage; MIS 3
语种	英语
scopus关键词	arid region; climate change; Holocene; marine isotope stage; paleoclimate; paleoenvironment; sediment core; China; Qaidam Basin; Qarhan Salt Lake; Qinghai; Qinghai-Xizang Plateau
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150476
作者单位	College of Resource Environment & Tourism, Capital Normal University, Beijing, 100048, China
推荐引用方式 GB/T 7714	Zhang M.,Liu X.. Climate changes in the Qaidam Basin in NW China over the past 40 kyr[J],2020,551.
APA	Zhang M.,&Liu X..(2020).Climate changes in the Qaidam Basin in NW China over the past 40 kyr.Palaeogeography, Palaeoclimatology, Palaeoecology,551.
MLA	Zhang M.,et al."Climate changes in the Qaidam Basin in NW China over the past 40 kyr".Palaeogeography, Palaeoclimatology, Palaeoecology 551(2020).