Articles | Volume 20, issue 12
https://doi.org/10.5194/bg-20-2347-2023
https://doi.org/10.5194/bg-20-2347-2023
Research article
 | 
21 Jun 2023
Research article |  | 21 Jun 2023

Biogeochemical processes captured by carbon isotopes in redox-stratified water columns: a comparative study of four modern stratified lakes along an alkalinity gradient

Robin Havas, Christophe Thomazo, Miguel Iniesto, Didier Jézéquel, David Moreira, Rosaluz Tavera, Jeanne Caumartin, Elodie Muller, Purificación López-García, and Karim Benzerara

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Cited articles

Adame, M. F., Alcocer, J., and Escobar, E.: Size-fractionated phytoplankton biomass and its implications for the dynamics of an oligotrophic tropical lake, Freshw. Biol., 53, 22–31, https://doi.org/10.1111/j.1365-2427.2007.01864.x, 2008. 
Ader, M., Macouin, M., Trindade, R. I. F., Hadrien, M.-H., Yang, Z., Sun, Z., and Besse, J.: A multilayered water column in the Ediacaran Yangtze platform? Insights from carbonate and organic matter paired δ13C, Earth Planet. Sc. Lett., 288, 213–22, https://doi.org/10.1016/j.epsl.2009.09.024, 2009. 
Aharon, P.: Redox stratification and anoxia of the early Precambrian oceans: Implications for carbon isotope excursions and oxidation events, Precambrian Res., 173, 207–222, https://doi.org/10.1016/j.precamres.2005.03.008, 2005. 
Alcocer, J.: Lake Alchichica Limnology, Springer Nature, https://doi.org/10.1007/978-3-030-79096-7, 2021. 
Alcocer, J., Ruiz-Fernández, A. C., Escobar, E., Pérez-Bernal, L. H., Oseguera, L. A., and Ardiles-Gloria, V.: Deposition, burial and sequestration of carbon in an oligotrophic, tropical lake, J. Limnol., 73, 223–235, https://doi.org/10.4081/jlimnol.2014.783, 2014. 
Short summary
We describe the C cycle of four modern stratified water bodies from Mexico, a necessary step to better understand the C cycle of primitive-Earth-like environments, which were dominated by these kinds of conditions. We highlight the importance of local external factors on the C cycle of these systems. Notably, they influence the sensitivity of the carbonate record to environmental changes. We also show the strong C-cycle variability among these lakes and their organic C sediment record.
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