气候变化领域集成服务门户(CCPortal): Enhanced aridity in the source region of the Yangtze River since 5.8 ka revealed by the sediments of Saiyong Co

CCPortal

DOI	10.1016/j.quaint.2021.10.018
	Enhanced aridity in the source region of the Yangtze River since 5.8 ka revealed by the sediments of Saiyong Co
	Hou, Xiaohuan; Liu, Lina; Sun, Zhe; Wang, Mingda; Cao, Xianyong; Hou, Juzhi
通讯作者	Cao, XY ; Hou, JZ (通讯作者)
发表日期	2022
ISSN	1040-6182
EISSN	1873-4553
起始页码	81
结束页码	90
卷号	613
英文摘要	The Yangtze River is a major component of the 'Asian Water Tower' and it provides freshwater resources for hundreds of millions of people in East Asia. Hence, climatic and environmental changes in the source region of the Yangtze River (SRYR) are of major significance for understanding changes in the status of its freshwater resources. However, due to the contradictory results shown by the available paleoclimatic records from the SRYR and neighboring regions, it remains unclear how the regional climate and hydrology have evolved since the middle Holocene. Here, we present records of hydrological variations based on multiple proxies (grain size, scanned micro-scale X-ray fluorescence (XRF) element composition, and loss on ignition (LOI)) of the sediments of alpine lake Saiyong Co, with the aim of reconstructing hydrological changes in the SRYR since 5.8 ka. The first principal component (PC1) of the XRF scanned element record is dominated by Ti, Fe and K, representing terrigenous inputs from the catchment. The LOI profile shows an inverse pattern of variation to that of PC1, suggesting that the sedimentary organic matter is primarily derived from aquatic plants. Since 5.8 ka the overall decrease in sample scores on PC1 and the increasing LOI, together with the grain-size based lake-level record, indicate an overall drying trend in SRYR. Furthermore, several major droughts are recorded, at similar to 4.0 ka, similar to 2.8 ka and similar to 1.8 ka. The hydrological variations at Saiyong Co are supported by multiple records from the SRYR, suggesting that millennial-scale environmental variations were regionally synchronous and were influenced by Northern Hemisphere summer insolation and movement of the intertropical convergence zone.
关键词	NORTHEASTERN TIBETAN PLATEAU INTERTROPICAL CONVERGENCE ZONE HOLOCENE MOISTURE AVAILABILITY SUMMER MONSOON VARIABILITY LAGUNA-POTROK-AIKE LAKE DONGGI CONA LAST 2 MILLENNIA CLIMATE-CHANGE INDIAN MONSOON ASIAN MONSOON
英文关键词	Tibetan plateau (TP); Yangtze river; Hydrology; Middle to late holocene; Indian summer monsoon (ISM)
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000740415800002
来源期刊	QUATERNARY INTERNATIONAL
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/260623
推荐引用方式 GB/T 7714	Hou, Xiaohuan,Liu, Lina,Sun, Zhe,et al. Enhanced aridity in the source region of the Yangtze River since 5.8 ka revealed by the sediments of Saiyong Co[J]. 中国科学院青藏高原研究所,2022,613.
APA	Hou, Xiaohuan,Liu, Lina,Sun, Zhe,Wang, Mingda,Cao, Xianyong,&Hou, Juzhi.(2022).Enhanced aridity in the source region of the Yangtze River since 5.8 ka revealed by the sediments of Saiyong Co.QUATERNARY INTERNATIONAL,613.
MLA	Hou, Xiaohuan,et al."Enhanced aridity in the source region of the Yangtze River since 5.8 ka revealed by the sediments of Saiyong Co".QUATERNARY INTERNATIONAL 613(2022).