Articles | Volume 19, issue 18
Biogeosciences, 19, 4459–4477, 2022
https://doi.org/10.5194/bg-19-4459-2022
Biogeosciences, 19, 4459–4477, 2022
https://doi.org/10.5194/bg-19-4459-2022
Research article
15 Sep 2022
Research article | 15 Sep 2022

The influence of near-surface sediment hydrothermalism on the TEX86 tetraether-lipid-based proxy and a new correction for ocean bottom lipid overprinting

Jeremy N. Bentley et al.

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Cited articles

Bentley, J. N., Ventura, G. T., Dalzell, C. J., Walters, C. C., Peters, C. A., Mennito, A. S., Nelson, R. K., Reddy, C. M., Walters, C. J., Seewald, J., and Sievert, S. M.: Archaeal lipid diversity, alteration, preservation at Cathedral Hill, Guaymas Basin, and its link to the deep time preservation paradox, Org. Geochem., 163, 104302, https://doi.org/10.1016/j.orggeochem.2021.104302, 2022. 
Besseling, M. A., Hopmans, E. C., Bale, N. J., Schouten, S., Sinninghe Damsté, J. S., and Villanueva, L.: The absence of intact polar lipid-derived GDGTs in marine waters dominated by Marine Group II: Implications for lipid biosynthesis in Archaea, Sci. Rep., 10, 294, https://doi.org/10.1038/s41598-019-57035-0, 2020. 
Besseling, M., Hopmans, E. C., Koenen, M., van der Meer, M. T. J., Vreugdenhil, S., Schouten, S., Sinninghe Damsté, J. S., and Villanueva, L.: Depth-related differences in archaeal populations impact the isoprenoid tetraether lipid composition of the Mediterranean Sea water column, Org. Geochem., 135, 16–31, https://doi.org/10.1016/j.orggeochem.2019.06.008, 2019. 
Biddle, J. F., Cardman, Z., Mendlovitz, H., Albert, D. B., Lloyd, K. G., Boetius, A., and Teske, A.: Anaerobic oxidation of methane at different temperature regimes in Guaymas Basin hydrothermal sediments, ISME J., 6, 1018–1031, https://doi.org/10.1038/ismej.2011.164, 2012. 
Boetius, A., Ravenschlag, K., Schubert, C., Rickert, D, Widdel, F., Gieseke, A., Amann, R., Jørgensen, B. B., Witte, U., and Pfannkuche, O.: A marine microbial consortium apparently mediating anaerobic oxidation of methane, Nature, 407, 623–626, https://doi.org/10.1038/35036572, 2000. 
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Short summary
We demonstrate the TEX86 (TetraEther indeX of 86 carbon atoms) paleoclimate proxy can become heavily impacted by the ocean floor archaeal community. The impact results from source inputs, their diagenetic and catagenetic alteration, and further overprint by the additions of lipids from the ocean floor sedimentary archaeal community. We then present a method to correct the overprints by using IPLs (intact polar lipids) extracted from both water column and subsurface archaeal communities.
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