Paleoenvironmental changes of Cuona Lake on the central Tibetan Plateau over the last 13 kyrs based on organic geochemical proxies

doi:10.1016/j.palaeo.2024.112061

	Paleoenvironmental changes of Cuona Lake on the central Tibetan Plateau over the last 13 kyrs based on organic geochemical proxies
	Ma, Ruifang 5; Jin, Chuanfang 2,3,4; Kang, Shichang 5; Li, Shijie 1; Chen, Wei 3,4
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2024-03-15
卷号	638 页码:12
关键词	N-Alkanes Hydrogen isotopes delta C-13(org) TOC/TN ratio Westerlies Central Tibetan Plateau
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2024.112061
通讯作者	Chen, Wei(weichen@nigpas.ac.cn)
英文摘要	The influence of the Indian summer monsoon (ISM) and mid-latitude westerlies on the central Tibetan Plateau (TP) during the Holocene, particularly during the mid-Holocene, is still unclear, limiting our understanding of past climate change in this region. Cuona Lake, located on the central TP, is a transitional zone of atmospheric circulation that is well situated for investigations on the interplay between the ISM and mid-latitude westerlies. In this study, multiple proxies of lacustrine sediments from Cuona Lake were measured, including total organic carbon (TOC), total nitrogen (TN), delta C-13(org), n-alkanes, and their hydrogen isotopes, to reconstruct the evolution of climate on the central TP over the past 13 cal kyr BP. Decreased TOC/TN ratios, dominant short-chain n-alkanes/alkanoic acid C-15/16/17, and lower values of n-alkane indicator ratios (carbon preference index and average chain length) throughout the investigated period suggest that the organic matter of the lake essentially originated from aquatic algae, and was weakly affected by terrestrial input. The historic variations in the delta D, TOC, and delta C-13(org) values revealed cold-wet conditions during 12.4-11.4 cal kyr BP, warm-wettest environments during the early Holocene (from 11.4 to 8.2 cal kyr BP), cool-wet conditions in the mid-late Holocene (from 5 to 3 cal kyr BP), and warm-dry conditions since 3 cal kyr BP. The reconstructed climatic variability in the Cuona area agrees well with previous indexes in south-central TP, indicating that the climatic pattern of the studied area is basically controlled by the monsoonal circulation from the late part of the last deglaciation to the early Holocene, with the ISM reaching the north-central TP at similar to 11 cal kyr BP. During the mid-late Holocene, the humid conditions coincided with an enhanced influence of westerlies, providing strong evidence for the contribution of westerlies-delivered moisture to the central TP. Based on a comparison of paleoclimate records, the Cuona region displays a transitional phase between monsoon circulation and westerly jets during the Holocene.
资助项目	National Natural Science Foundation of China[41877432] ; National Natural Science Foundation of China[42206079] ; National Natural Science Foundation of China[41701221] ; CAS Strategic Priority Research Program[XDB2600000]
WOS关键词	CARBON-ISOTOPIC COMPOSITION ; SEDIMENTARY N-ALKANES ; MID-LATE HOLOCENE ; DELTA-D VALUES ; CLIMATE-CHANGE ; INDIAN MONSOON ; NAM CO ; HYDROLOGICAL CHANGES ; LACUSTRINE SEDIMENT ; MOISTURE EVOLUTION
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001176868700001
资助机构	National Natural Science Foundation of China ; CAS Strategic Priority Research Program
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/43520]
专题	中国科学院南京地质古生物研究所
通讯作者	Chen, Wei
作者单位	1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China 2.Sanjiang Univ, Sch Culture Ind & Tourism Management, Nanjing 210012, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironment, Nanjing 210008, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 5.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Ma, Ruifang,Jin, Chuanfang,Kang, Shichang,et al. Paleoenvironmental changes of Cuona Lake on the central Tibetan Plateau over the last 13 kyrs based on organic geochemical proxies[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2024,638:12.
APA	Ma, Ruifang,Jin, Chuanfang,Kang, Shichang,Li, Shijie,&Chen, Wei.(2024).Paleoenvironmental changes of Cuona Lake on the central Tibetan Plateau over the last 13 kyrs based on organic geochemical proxies.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,638,12.
MLA	Ma, Ruifang,et al."Paleoenvironmental changes of Cuona Lake on the central Tibetan Plateau over the last 13 kyrs based on organic geochemical proxies".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 638(2024):12.