干旱区生态环境知识资源中心(Arid): The coupled evolution of mid- to late Holocene temperature and moisture in the southeast Qaidam Basin

Arid

DOI	10.1016/j.chemgeo.2019.119282
	The coupled evolution of mid- to late Holocene temperature and moisture in the southeast Qaidam Basin
	Sun, Wei 1,2,3,4; Zhao, Shijin 1; Pei, Hongye 1; Yang, Huan 5
通讯作者	Yang, Huan
来源期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
EISSN	1872-6836
出版年	2019
卷号	528
英文摘要	The southeast Qaidam Basin (SQB) lies near the boundary between the modern-day Asian summer monsoon (ASM) and mid-latitude westerly jet, and the paleoclimate variation in this region can be affected by these two atmospheric circulation systems. Reconstructions of paleotemperature and palaeohydrology are therefore critical to constraining the driving forces of climate in this region, where the ecological environment is fragile. Here, we analyzed glycerol dialkyl glycerol tetraethers (GDGTs), microbial membrane lipids occurring ubiquitously in aquatic and terrestrial environments across the globe, in an aeolian sediment profile over the last 7000 years from Xiangride Town (XRD) of southeast Qaidam Basin (SQB), China. The temperature record was generated using the global calibration of MAT(mr) based on branched GDGTs (brGDGTs), whereas the palaeohydrological condition was reconstructed from the relative abundance of isoprenoid GDGTs vs. brGDGTs (R-i/b), the cyclisation index of brGDGTs (CBT), and the brGDGT-based pH indices. The results show that the paleoclimate during the mid-Holocene was relatively warmer and wetter in the SQB. Afterwards it was a trend to a cold and dry climate. Temperature variation was highly coupled with the moisture change during the mid- to late Holocene, as opposed to some previous studies showing a warm-dry and cold-wet climate pattern in the northern Qaidam basin. The palaeohydrological evolution agrees with the precipitation pattern of the Chinese loess plateau but opposes to that in Northeastern China, the middle reaches of Yangtze river and Arid Central Asia (ACA), implying that the ASM strength is the driving force of precipitation evolution during the mid- to late Holocene in the SQB and the spatial heterogeneity of the mid- to late Holocene precipitation pattern across China is remarkable. A rapid cold and drought event at around 4 ka before present (BP) was identified, which might be a key factor that caused the decline in the agricultural civilization during the late Neolithic Age in northwestern China.
英文关键词	GDGTs Qaidam Basin Loess Temperature Soil moisture Asian summer monsoon
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000505975900015
WOS关键词	DIALKYL GLYCEROL TETRAETHERS ; ARID CENTRAL-ASIA ; QINGHAI-TIBETAN PLATEAU ; CLIMATE-CHANGE ; LAKE QINGHAI ; MONSOON PRECIPITATION ; BRANCHED TETRAETHERS ; EAST-ASIA ; NE CHINA ; SEDIMENTS
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
EI主题词	2019-12-05
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311586
作者单位	1.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China; 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China; 3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Resources Utilizat & P, Guangzhou 510640, Guangdong, Peoples R China; 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 5.China Univ Geosci, Sch Geog & Informat Engn, Hubei Key Lab Crit Zone Evolut, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Sun, Wei,Zhao, Shijin,Pei, Hongye,et al. The coupled evolution of mid- to late Holocene temperature and moisture in the southeast Qaidam Basin[J],2019,528.
APA	Sun, Wei,Zhao, Shijin,Pei, Hongye,&Yang, Huan.(2019).The coupled evolution of mid- to late Holocene temperature and moisture in the southeast Qaidam Basin.CHEMICAL GEOLOGY,528.
MLA	Sun, Wei,et al."The coupled evolution of mid- to late Holocene temperature and moisture in the southeast Qaidam Basin".CHEMICAL GEOLOGY 528(2019).