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Variation in 6-methyl branched glycerol dialkyl glycerol tetraethers in Lantian loess-paleosol sequence and effect on paleotemperature reconstruction
Lu, Hongxuan1; Liu, Weiguo1,2; Wang, Huanye1; Wang, Zheng1
2016-10-01
Source PublicationORGANIC GEOCHEMISTRY
Volume100Issue:2016Pages:10-17
SubtypeArticle
AbstractThe distribution of branched glycerol dialkyl glycerol tetraethers (brGDGTs) has been increasingly used as a proxy in paleoclimate studies of marine, lacustrine and loess environments. A paleothermometer was subsequently quantified using a combination of the methylation and cyclization index of branched tetraethers (MBT-CBT) on the basis that MBT was related to mean annual air temperature and to a lesser extent soil pH, whereas CBT correlated only with soil pH. As newly described 6-methyl brGDGTs seemed to introduce a dependence on soil pH of this temperature proxy, we investigated the effect of the 6-methyl brGDGTs on an existing paleotemperature reconstruction. We describe the evolution in temperature and pH recorded in the Lantian loess-paleosol sequence for the last 120 kyr, using a new analytical method. The results show that 6-methyl brGDGTs were abundant, comprising on average 26% of the total amount of brGDGTs in the sequence. The fractional abundance of 6-methyl brGDGTs generally tracked the change in soil pH at the same soil section. A considerable delay (up to ca. 7 kyr) in the variation in fractional abundance of 6-methyl brGDGTs vs. that of 5-methyl brGDGTs was observed, possibly resulting from the different environmental factors to which they respond. We also found that variation in the reconstructed MAT values using different calibrations could be up to 7 degrees C, possibly due to soil moisture variation, since soil moisture may have a significant impact on the distribution of brGDGTs. Our results further indicate that early warming occurred on the southern Chinese Loess Plateau relative to a monsoonal precipitation increase, as reported elsewhere. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordGdgts Loess Lantian Paleotemperature Reconstruction
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.orggeochem.2016.07.006
WOS KeywordCHINESE LOESS ; MEMBRANE-LIPIDS ; MONSOON PRECIPITATION ; TEMPERATURE PROXY ; LAKE-SEDIMENTS ; AFRICAN LAKE ; EAST-ASIA ; SOILS ; PLATEAU ; DISTRIBUTIONS
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000381909900002
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5696
Collection加速器质谱中心
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
2.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China
Recommended Citation
GB/T 7714
Lu, Hongxuan,Liu, Weiguo,Wang, Huanye,et al. Variation in 6-methyl branched glycerol dialkyl glycerol tetraethers in Lantian loess-paleosol sequence and effect on paleotemperature reconstruction[J]. ORGANIC GEOCHEMISTRY,2016,100(2016):10-17.
APA Lu, Hongxuan,Liu, Weiguo,Wang, Huanye,&Wang, Zheng.(2016).Variation in 6-methyl branched glycerol dialkyl glycerol tetraethers in Lantian loess-paleosol sequence and effect on paleotemperature reconstruction.ORGANIC GEOCHEMISTRY,100(2016),10-17.
MLA Lu, Hongxuan,et al."Variation in 6-methyl branched glycerol dialkyl glycerol tetraethers in Lantian loess-paleosol sequence and effect on paleotemperature reconstruction".ORGANIC GEOCHEMISTRY 100.2016(2016):10-17.
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