干旱区生态环境知识资源中心(Arid): Long-chain alkenones in the lake sediments of North-Minusinsk Valley (southern Siberia): implications for paleoclimate reconstructions

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DOI	10.1016/j.orggeochem.2022.104541
	Long-chain alkenones in the lake sediments of North-Minusinsk Valley (southern Siberia): implications for paleoclimate reconstructions
	Bulkhin, Alexander O.; V. Zykov, Vladimir; Marchenko, Dmitry N.; Kabilov, Marsel R.; Baturina, Olga A.; Boyandin, Anatoly N.; Anishchenko, Olesya, V; Rogozin, Denis Y.
通讯作者	Rogozin, DY
来源期刊	ORGANIC GEOCHEMISTRY
ISSN	0146-6380
EISSN	1873-5290
出版年	2023
卷号	176
英文摘要	Long-chain alkenones (LCAs) are polyunsaturated methyl or ethyl ketones exclusively produced by Groups 1-3 Isochrysidales, an order of haptophyte algae. LCAs have great potential as temperature and salinity proxies for paleo-reconstructions. Alkenone producers occur extensively in lacustrine and in open marine systems. However, factors influencing LCAs occurrence, abundance, compositional pattern, and unsaturation indices are insufficiently understood in lakes of southern Siberia. Here we investigated alkenone distributions in freshwater to saline lakes of a semi-arid region of southern Siberia (n = 22). We find that total alkenone concentrations increase dramatically above a salinity of about 20 g L-1. Analysis of 18S rRNA and the alkenone composition suggest that all alkenone-containing lakes are inhabited by Group 2 haptophytes except one low-saline lake, where Group 1 representatives prevail. The C37/C38 ratio is negatively correlated with salinity, and, hence, this parameter can be used as a salinity indicator. At the same time, %C37:4 is not correlated with salinity, whereas the average chain length of alkenones increases with salinity. The taxonomic composition of haptophytes and the alkenone composition were comparable to those in the lakes in the Canadian Prairies, potentially because of the similarities in climatic factors and ionic composition of lake water in the two regions. This study shows for the first time that unsaturation indexes UK40 and UK ' 40 are positively correlated with salinity and, thus, can be used as a salinity proxy for regional climate reconstruction.
英文关键词	Alkenones Salinity indicator Lake sediments Southern Siberia Minusinsk Hollow
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000925543500001
WOS关键词	UNSATURATED ALKENONE ; BALTIC SEA ; TEMPERATURE ; LACUSTRINE ; PALEOTEMPERATURE ; DISTRIBUTIONS ; CALIBRATION ; INDEX ; HYPERSALINE ; VEGETATION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397939
推荐引用方式 GB/T 7714	Bulkhin, Alexander O.,V. Zykov, Vladimir,Marchenko, Dmitry N.,et al. Long-chain alkenones in the lake sediments of North-Minusinsk Valley (southern Siberia): implications for paleoclimate reconstructions[J],2023,176.
APA	Bulkhin, Alexander O..,V. Zykov, Vladimir.,Marchenko, Dmitry N..,Kabilov, Marsel R..,Baturina, Olga A..,...&Rogozin, Denis Y..(2023).Long-chain alkenones in the lake sediments of North-Minusinsk Valley (southern Siberia): implications for paleoclimate reconstructions.ORGANIC GEOCHEMISTRY,176.
MLA	Bulkhin, Alexander O.,et al."Long-chain alkenones in the lake sediments of North-Minusinsk Valley (southern Siberia): implications for paleoclimate reconstructions".ORGANIC GEOCHEMISTRY 176(2023).