气候变化领域集成服务门户(CCPortal): Holocene hydroclimate in the source region of the Yellow River: A new sediment record from Lake Gyaring; NE Tibetan Plateau

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DOI	10.1016/j.jseaes.2020.104601
	Holocene hydroclimate in the source region of the Yellow River: A new sediment record from Lake Gyaring; NE Tibetan Plateau
	Zhao W.; Chen C.; Jiang Q.; Ji M.; Zhen J.; Yang Y.; Ning D.; Li X.; Shen J.
发表日期	2021
ISSN	13679120
卷号	205
英文摘要	The environmental history of the source region of the Yellow River (SRYR) is vital for understanding its hydrological response to climate processes in the alpine northeastern Tibetan Plateau (TP). In this study, we present the first sediment core record from Lake Gyaring, one of the largest fresh lakes in SRYR, using proxies of total organic carbon, total nitrogen, C/N ratio, δ13Corg, chlorophyll a, and grain size, to discuss the environmental variations over past 10 kyr. The results show that sedimentary organic matter mainly originated from the aquatic macrophytes and phytoplankton, the relative abundance of which can serve as a qualitative indicator of lake level changes of Lake Gyaring. From 10 to 6.2 cal kyr B.P., the notable expansion of macrophytes was favored by the warm conditions and an enlarged littoral zone due to lake-level decline. The abrupt cooling between 8.9 and 8 cal kyr B.P. led to temporal lake-level rises that significantly reduced macrophyte primary production. After 6.2 cal kyr B.P., the lake turned to be phytoplankton-dominated following the cooling trend and stepwise increase in lake level. The inferred climate pattern in the lake catchment with an overall dry early to mid Holocene and moister mid to late Holocene disagrees with the Asian monsoon variations. This phenomenon is well recognized by the lake-level records from most of the northeastern TP lakes, implying that strong evaporation in semi-arid lake catchments could have outweighed the increased regional precipitation during early to mid Holocene and vice versa for mid to late Holocene. © 2020 Elsevier Ltd
英文关键词	Alpine lake; Bulk organic matter; Grain size; Lake level; Monsoon; Yellow River
语种	英语
scopus关键词	Journal of Asian Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158352
作者单位	School of Geographic Science; Nantong University; Nantong; 226007; China; State Key Laboratory of Lake Sciences and Environment; Nanjing Institute of Geography and Limnology; Chinese Academy of Sciences; Nanjing; 210008; China; Yunnan Key Laboratory of Earth System Science; Yunnan University; Kunming; 650500; China; School of Geography and Marine Sciences; Nanjing University; Nanjing; 210046; China
推荐引用方式 GB/T 7714	Zhao W.,Chen C.,Jiang Q.,et al. Holocene hydroclimate in the source region of the Yellow River: A new sediment record from Lake Gyaring; NE Tibetan Plateau[J],2021,205.
APA	Zhao W..,Chen C..,Jiang Q..,Ji M..,Zhen J..,...&Shen J..(2021).Holocene hydroclimate in the source region of the Yellow River: A new sediment record from Lake Gyaring; NE Tibetan Plateau.,205.
MLA	Zhao W.,et al."Holocene hydroclimate in the source region of the Yellow River: A new sediment record from Lake Gyaring; NE Tibetan Plateau".205(2021).