Long-chain alkenone distributions and temperature dependence in lacustrine surface sediments from China

doi:10.1016/j.gca.2005.04.008

	Long-chain alkenone distributions and temperature dependence in lacustrine surface sediments from China
	Chu, GQ ; Sun, Q ; Li, SQ ; Zheng, MP ; Jia, XX ; Lu, CF ; Liu, JQ ; Liu, TS
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2005-11-01
卷号	69 期号:21 页码:4985-5003
ISSN号	0016-7037
DOI	10.1016/j.gca.2005.04.008
文献子类	Review
英文摘要	Long-chain alkenones (LCK) of lacustrine surface sediments were analyzed in 37 lakes from China. The results obtained were complemented by published data from 13 other Chinese lakes. These lakes are located across large temperature and precipitation gradients, therefore allowing for an assessment of the distribution pattern of LCK and their temperature dependency. Different distribution patterns of LCK (C-37 predominant pattern and C-38 predominant pattern) were detected in the surface sediment samples. The ratio of C-37:4 methyl ketone to the sum of C-37 alkenones observed in the different lakes is highly variable (5%-96%, with mean value of 55%), and more than that seen in marine systems. The finding that some of the ocean LCK precursor algae (Gephyrocapsa oceanica, Coccolithus pelagicus) were also present in the limnic systems suggested that both systems might have similar biosynthetic sources. Empirical relationships between the alkenone unsaturation index U-37(k') and different temperature sets (mean annual air temperature, mean annual air temperature in different seasons, and lake surface water temperature of July) were tested. The best correlation between U-37(k') and temperature was obtained using mean annual air temperature. A general linear regression of U-37(k') and MAAT can be expressed as U-37(k') = 0.0328 x T + 0.126 (n = 38, r(2) = 0.83). Although questions such as species-uncertainty and other unknown factors for U-37(k') temperature dependence still remain, the equation might be representative of the average contribution of LCK to sediments for these data over a wide range of surface temperatures, water chemistry and different alkenones-producer algal populations. The general relationship of U-37(k'), and mean annual air temperature is consistent with that in marine systems. It supports the suggestion that the biosynthetic pathway of alkenones and the mechanism of their temperature signal may be similar in both marine and limnic systems. LCK might be used as an important paleotemperalure proxy in limnic environment. Copyright (c) 2005 Elsevier Ltd
WOS关键词	EASTERN NORTH-ATLANTIC ; MADEIRA ABYSSAL-PLAIN ; CORE-TOP CALIBRATION ; TROPICAL SOUTH CHINA ; EMILIANIA-HUXLEYI ; ALKYL ALKENOATES ; GEPHYROCAPSA-OCEANICA ; PALEOTEMPERATURE ESTIMATION ; NUTRIENT CONCENTRATIONS ; MICROBIAL-DEGRADATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000233846300006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/65162]
专题	中国科学院地质与地球物理研究所
通讯作者	Chu, GQ
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Natl Res Ctr Geoanal, Beijing 100037, Peoples R China 3.CEA, Inst Earthquake Sci, Beijing 100036, Peoples R China 4.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China 5.Chinese Acad Geol Sci, Open Lab Saline Lake Resources & Environm, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Chu, GQ,Sun, Q,Li, SQ,et al. Long-chain alkenone distributions and temperature dependence in lacustrine surface sediments from China[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2005,69(21):4985-5003.
APA	Chu, GQ.,Sun, Q.,Li, SQ.,Zheng, MP.,Jia, XX.,...&Liu, TS.(2005).Long-chain alkenone distributions and temperature dependence in lacustrine surface sediments from China.GEOCHIMICA ET COSMOCHIMICA ACTA,69(21),4985-5003.
MLA	Chu, GQ,et al."Long-chain alkenone distributions and temperature dependence in lacustrine surface sediments from China".GEOCHIMICA ET COSMOCHIMICA ACTA 69.21(2005):4985-5003.