气候变化领域集成服务门户(CCPortal): Terrestrial mollusk records in the loess sequences from eastern Central Asia since the last deglaciation and their paleoenvironmental significance

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DOI	10.1016/j.palaeo.2020.109890
	Terrestrial mollusk records in the loess sequences from eastern Central Asia since the last deglaciation and their paleoenvironmental significance
	Zong X.; Dong J.; Cheng P.; Song Y.; Liu W.; Li Y.; Lan J.
发表日期	2020
ISSN	0031-0182
卷号	556
英文摘要	A variety of proxies has been studied to document paleoclimatic changes in arid Central Asia (ACA). However, biological archives, which can be directly related to climatic conditions, are still scarce in this region. Here we report records of the total count fossils (TCF) of terrestrial mollusks, organic carbon isotopes (δ13Corg) and loss on ignition (LOI), since the last deglaciation in the Talede and XRBLK loess sections in Xinjiang, eastern Central Asia. Prior to the Holocene, the records show rare fossils with relatively low LOI and more positive δ13Corg, indicating low biomass/organic carbon content under dry conditions which were unfavorable for the survival of snails. In contrast, TCF increased abruptly at the beginning of Holocene, coincident with a prominent increase in LOI and a marked negative shift in δ13Corg. Furthermore, TCF increased gradually to its maximum and δ13Corg became progressively negative with constant high LOI from the early to late Holocene. The variations imply a trend towards wetter environment, with optimal moisture (precipitation/relative humidity) conditions occurring in the late Holocene. Overall, this Holocene moisture evolution history could be attributed to the variations of Westerlies strength modulated by the latitudinal temperature gradient and the insolation-related evaporation should also be concerned. © 2020 Elsevier B.V.
英文关键词	Carbon isotopes; Holocene; Moisture; The Ili Basin; Westerlies Asia
语种	英语
scopus关键词	evaporation; Holocene; last deglaciation; loess; mollusc; organic carbon; snail; survival; temperature gradient; westerly; Central Asia; Gastropoda; Mollusca
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150374
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Zong X.,Dong J.,Cheng P.,et al. Terrestrial mollusk records in the loess sequences from eastern Central Asia since the last deglaciation and their paleoenvironmental significance[J],2020,556.
APA	Zong X..,Dong J..,Cheng P..,Song Y..,Liu W..,...&Lan J..(2020).Terrestrial mollusk records in the loess sequences from eastern Central Asia since the last deglaciation and their paleoenvironmental significance.Palaeogeography, Palaeoclimatology, Palaeoecology,556.
MLA	Zong X.,et al."Terrestrial mollusk records in the loess sequences from eastern Central Asia since the last deglaciation and their paleoenvironmental significance".Palaeogeography, Palaeoclimatology, Palaeoecology 556(2020).