气候变化领域集成服务门户(CCPortal): TEX86 as a potential proxy of lake water pH in the Tibetan Plateau

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DOI	10.1016/j.palaeo.2019.109381
	TEX86 as a potential proxy of lake water pH in the Tibetan Plateau
	Wang, Mingda; Tian, Qian; Li, Xiumei; Liang, Jie; He, Yue; Hou, Juzhi
通讯作者	Wang, MD ; Hou, JZ (通讯作者)
发表日期	2020
ISSN	0031-0182
EISSN	1872-616X
卷号	538
英文摘要	Water pH represents one of the most important indicators of chemical and biological changes in lacustrine systems. However, although water pH is also a major influence on inland water bodies and related ecosystems, it is not well studied in the lakes of the Tibetan Plateau (TP). The applicability of diatom assemblages, an effective proxy of variations in water pH in freshwater lakes, is greatly limited in the TP because the alkaline environment in most of the lakes is unfavorable for the preservation of diatom frustules. Isoprenoid glycerol dialkyl glycerol tetraethers (iGDGTs) are a series of specific membrane lipids biosynthesized by archaea, which appear to be a promising method for reflecting lake water pH variations. In this study, we analyzed the distribution of iGDGTs in the surface sediments of 34 alpine TP lakes and combined the data with published iGDGTs results from across the TP, in order to examine the effect of various environmental factors on iGDGT cyclization. The results show that water pH appears to be the most important factor affecting the degree of cyclization of iGDGTs in high-elevation alkaline lakes. This also suggests that the novel temperature proxy, TEX86, is also a promising water pH proxy for alpine lakes in the region. Despite a moderate correlation is observed between TEX86 and water pH, caution is needed in the interpretation of the TEX86 records, since other factors, such as temperature and the dissolved oxygen level, may also have an influence. Nevertheless, TEX86 appears to be a promising indicator of water pH for the alkaline lakes of the TP, and it could be a potentially useful tool for reconstructing pH in alkaline lakes in other areas, after regional calibrations.
关键词	DIALKYL GLYCEROL TETRAETHERS CRENARCHAEOTAL MEMBRANE-LIPIDS HOLOCENE ENVIRONMENTAL-CHANGES LOESS-PALEOSOL SEQUENCE SURFACE SEDIMENTS PALEOTEMPERATURE PROXY ARCHAEAL LIPIDS CLIMATE-CHANGE ETHER LIPIDS ARCTIC LAKES
英文关键词	iGDGTs; Cyclization; TEX86; Water pH; Tibetan Plateau; Alkaline lake
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000508751800005
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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/259948
推荐引用方式 GB/T 7714	Wang, Mingda,Tian, Qian,Li, Xiumei,et al. TEX86 as a potential proxy of lake water pH in the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,538.
APA	Wang, Mingda,Tian, Qian,Li, Xiumei,Liang, Jie,He, Yue,&Hou, Juzhi.(2020).TEX86 as a potential proxy of lake water pH in the Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,538.
MLA	Wang, Mingda,et al."TEX86 as a potential proxy of lake water pH in the Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 538(2020).