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- W4282821708 endingPage "104138" @default.
- W4282821708 startingPage "104138" @default.
- W4282821708 abstract "Glycerol dibiphytanyl glycerol tetraethers (GDGTs) are important archaeal membrane lipids that widely occur in marine water columns and sediments. Based on its sensitivity to temperature, the paleotemperature index TEX86 was developed and extensively studied. However, GDGTs in sediments are not only affected by their external sources, but also by internal biochemical processes. The effect of bottom water redox conditions on GDGT composition and TEX86 in the surface sediments remains unclear. In this study, field investigations in the eastern China marginal seas were conducted to trace the responses of sedimentary GDGTs to bottom dissolved oxygen (DO). Our results showed that the TEX86 was independent of the DO level. However, the decrease in DO was accompanied by an increase in GDGT Ring Index (RI) and relative abundance of crenarchaeol (Cren) in contrast to the decrease pattern for GDGT-0, suggesting that DO has important effects on the composition of GDGTs but shows limited impact on TEX86 in the study area. These changes were probably driven by archaeal adaptation, shift of community structure and degradation of GDGTs. In addition, strong relationships between DO and RI and between DO and GDGT abundances (i.e., %GDGT-0, GDGT-0/Cren) indicate that these parameters can be used as potential redox proxies for bottom water, especially in relatively stable stratified waters. Further studies coupled with archaeal community are needed to cover more areas to constrain their applicability and driving mechanisms." @default.
- W4282821708 created "2022-06-15" @default.
- W4282821708 creator A5000919987 @default.
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- W4282821708 creator A5031810848 @default.
- W4282821708 creator A5078863586 @default.
- W4282821708 creator A5088656397 @default.
- W4282821708 date "2022-07-01" @default.
- W4282821708 modified "2023-10-17" @default.
- W4282821708 title "Influence of bottom seawater oxygen on archaeal tetraether lipids in sediments: Implications for archaeal lipid-based proxies" @default.
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- W4282821708 doi "https://doi.org/10.1016/j.marchem.2022.104138" @default.
- W4282821708 hasPublicationYear "2022" @default.
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