Articles | Volume 12, issue 1
https://doi.org/10.5194/esurf-12-271-2024
https://doi.org/10.5194/esurf-12-271-2024
Research article
 | 
31 Jan 2024
Research article |  | 31 Jan 2024

Probing the exchange of CO2 and O2 in the shallow critical zone during weathering of marl and black shale

Tobias Roylands, Robert G. Hilton, Erin L. McClymont, Mark H. Garnett, Guillaume Soulet, Sébastien Klotz, Mathis Degler, Felipe Napoleoni, and Caroline Le Bouteiller

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Cited articles

Angert, A., Yakir, D., Rodeghiero, M., Preisler, Y., Davidson, E. A., and Weiner, T.: Using O2 to study the relationships between soil CO2 efflux and soil respiration, Biogeosciences, 12, 2089–2099, https://doi.org/10.5194/bg-12-2089-2015, 2015. 
Antoine, P., Giraud, A., Meunier, M., and Van Asch, T.: Geological and geotechnical properties of the “Terres Noires” in southeastern France: Weathering, erosion, solid transport and instability, Eng. Geol., 40, 223–234, https://doi.org/10.1016/0013-7952(95)00053-4, 1995. 
Ariagno, C., Le Bouteiller, C., van der Beek, P., and Klotz, S.: Sediment export in marly badland catchments modulated by frost-cracking intensity, Draix–Bléone Critical Zone Observatory, SE France, Earth Surf. Dynam., 10, 81–96, https://doi.org/10.5194/esurf-10-81-2022, 2022. 
Ariagno, C., Pasquet, S., Le Bouteiller, C., van der Beek, P., and Klotz, S.: Seasonal dynamics of marly badlands illustrated by field records of hillslope regolith properties, Draix–Bléone Critical Zone Observatory, South-East France, Earth Surf. Proc. Land., 1–14, https://doi.org/10.1002/esp.5564, 2023. 
Bao, Z., Haberer, C. M., Maier, U., Amos, R. T., Blowes, D. W., and Grathwohl, P.: Modeling controls on the chemical weathering of marine mudrocks from the Middle Jurassic in Southern Germany, Chem. Geol., 459, 1–12, https://doi.org/10.1016/j.chemgeo.2017.03.021, 2017. 
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Short summary
Chemical weathering of sedimentary rocks can release carbon dioxide and consume oxygen. We present a new field-based method to measure the exchange of these gases in real time, which allows us to directly compare the amount of reactants and products. By studying two sites with different rock types, we show that the chemical composition is an important factor in driving the weathering reactions. Locally, the carbon dioxide release changes alongside temperature and precipitation.