气候变化领域集成服务门户(CCPortal): Investigation of Modern n-Alkanes in Daihai Lake Basin, Northern China: Implications for the Interpretation of Paleoclimate Research

CCPortal

DOI	10.3389/feart.2022.915500
	Investigation of Modern n-Alkanes in Daihai Lake Basin, Northern China: Implications for the Interpretation of Paleoclimate Research
	Shen, Zhongwei; Zhang, Zhiping; Chen, Jie; Chen, Lin; Pang, Xin; Chen, Ruijin; Liu, Jianbao; Chen, Shengqian
通讯作者	Zhang, ZP (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	n-Alkanes are one of the most used proxies in lake sediments to reconstruct past climate change. However, the distribution and concentration of n-alkanes are controlled by multiple factors, and their interpretation across northern China has revealed obvious discrepancies. It is therefore important to investigate the controlling factors of n-alkane proxies before using them for paleoclimate reconstruction. In this study, we collected fresh plant leaves, basin surface soils, lake surface sediments, and a short sediment core (DH20B) in the Daihai Lake basin to analyze the paleoclimate implications of n-alkanes. Our results show that long-chain (C-27-C-35) n-alkanes in Daihai Lake are dominated by allochthonous sources. The average chain length of long-chain n-alkanes (ACL(27-35)) and total long-chain n-alkane concentration ( n-ary sumation alk(long-chain)) of DH20B are significantly correlated with regional summer temperature (r = 0.54, p < 0.01) and summer precipitation (r = 0.41, p < 0.05) over the past 60 years. These results indicate that ACL(27-35) and n-ary sumation alk(long-chain) from Daihai Lake sediments have the potential to reconstruct past summer temperature and summer precipitation, respectively, because higher summer temperature promotes the synthesis of longer-chain n-alkanes to reduce water loss (leading to higher ACL(27-35)) and increased summer precipitation promotes plant growth (leading to higher n-ary sumation alk(long-chain)). Moreover, we found that human activity significantly affected n-ary sumation alk(long-chain) through cultivation and grazing after 2005. Our findings may have broad significance for paleoclimate reconstruction of other hydrologically closed lakes, highlighting the importance of proxy validation studies.
关键词	CLIMATE-CHANGE SEDIMENTS PLANTS RECONSTRUCTION DISTRIBUTIONS RECORDS PROXY
英文关键词	n-alkane; proxy validation study; summer precipitation; summer temperature; human activity; Daihai Lake
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000806839300001
来源期刊	FRONTIERS IN EARTH SCIENCE
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/260589
推荐引用方式 GB/T 7714	Shen, Zhongwei,Zhang, Zhiping,Chen, Jie,et al. Investigation of Modern n-Alkanes in Daihai Lake Basin, Northern China: Implications for the Interpretation of Paleoclimate Research[J]. 中国科学院青藏高原研究所,2022,10.
APA	Shen, Zhongwei.,Zhang, Zhiping.,Chen, Jie.,Chen, Lin.,Pang, Xin.,...&Chen, Shengqian.(2022).Investigation of Modern n-Alkanes in Daihai Lake Basin, Northern China: Implications for the Interpretation of Paleoclimate Research.FRONTIERS IN EARTH SCIENCE,10.
MLA	Shen, Zhongwei,et al."Investigation of Modern n-Alkanes in Daihai Lake Basin, Northern China: Implications for the Interpretation of Paleoclimate Research".FRONTIERS IN EARTH SCIENCE 10(2022).