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Cycles, Atmosphere, Climates

Animators : Christophe Cloquet & Guillaume Paris

Permanent investigators : Pierre-Henri Blard, Guillaume Caro, Christophe Cloquet, Christian France-Lanord, Albert Galy, Bernard Marty, Guillaume Paris, Laurie Reisberg, Emilie Thomassot

Postdoctoral fellow : Isabella Zelano (2015-2018)

PhD students : Mathis Neimard (2017-2020), Yara Rahme (2015-2018), Nina Bothamy (2015-2018), Imene Bedja (2014-2017)

Former PhD students : Leo Martin (2012-2015),


The composition of the ocean-atmosphere system has varied significantly over time, based on exchanges with the biosphere, the cryosphere, and the inner Earth. However, both the impact and the response time feedback put into play by certain processes are still poorly determined. This lack is partially due to the fact that the levels of certain elements in the oceanic and atmospheric reservoirs are still not known for long time scales. For example, there is significant progress to be made to reliably determine the evolution of the atmospheric PCO2 during the Cenozoic period. In addition, the fluxes of input and output between the solid Earth and the fluid envelopes are still poorly quantified for certain elements, in both the current and the geological time scale (up to more than 100 My).

The projects intend (i) to quantify the impact of human activities on the atmosphere, hydrosphere, and biosphere ; (ii) to better characterise the geochemical cycles that control and have controlled the evolution of the ocean and atmosphere ; and (iii) to develop new integrated approaches to document of continental palaeoclimates, mainly by reconstructing Quaternary fluctuations of mountain glaciers. The periods covered range between the Anthropocene period and the geological time scale, touching on certain key episodes from the Quaternary period.

From the study of palaeo-atmospheric samples to marine biomineralisation, our scientific approach will be built on the diversity and quality of the state-of-the-art technology centre that the CRPG possesses (ion probe 1280 HR2, TIMS Triton Plus, MC-ICP-MS Neptune Plus, Helix Noble Gas Spectrometers SFT). This geochemical approach is completed by disciplines such as modelling, microbiology, and geomorphology, in collaboration with national and international laboratories.

Impact of human activities on the atmosphere, hydrosphere and biosphere
Mountain glaciers, tracers of continental palaeoclimates
Natural geochemical cycles : fluxes and compositions of the ocean and atmosphere





Recent publications

2018

Bickle, M. J., H. J. Chapman, E. Tipper, A. Galy, C. De La Rocha, and T. Ahmad. "Chemical weathering outputs from the flood plain of the Ganga." Geochimica et Cosmochimica Acta 225 (2018): 146–175.
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Burke, A., T. M. Present, G. Paris, E. C. M. Rae, B. H. Sandilands, J. Gaillardet, B. Peucker-Ehrenbrink, W. W. Fischer, J. W. McClelland et al. "Sulfur isotopes in rivers: Insights into global weathering budgets, pyrite oxidation, and the modern sulfur cycle." Earth and Planetary Science Letters 496 (2018): 168–177.
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Mariet, A. L., F. Monna, F. Gimbert, C. Bégeot, C. Cloquet, S. Belle, L. Millet, D. Rius, and A. V. Walter-Simonnet. "Tracking past mining activity using trace metals, lead isotopes and compositional data analysis of a sediment core from Longemer Lake, Vosges Mountains, France." Journal of Paleolimnology (2018).
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Mariet, A. L., A. V. Walter-Simonnet, F. Gimbert, C. Cloquet, and C. Bégeot. "High-temporal resolution landscape changes related to anthropogenic activities over the past millennium in the Vosges Mountains (France)." Ambio (2018).
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Schulze-Makuch, D., D. Wagner, S. Kounaves, K. Mangelsdorf, K. G. Devine, J. P. de Vera, P. Schmitt-Kopplin, H. P. Grossart, V. Parro, M. Kaupenjohann et al. "Transitory microbial habitat in the hyperarid Atacama Desert." PNAS (2018).
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Zelano, I., C. Cloquet, F. Fraysse, S. Dong, N. Janot, G. Echevarria, and E. Montargès-Pelletier. "The influence of organic complexation on Ni isotopic fractionation and Ni recycling in the upper soil layers." Chemical Geology 483 (2018): 47–55.
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Zhang, Y., H. Wen, C. Zhu, H. Fan, and C. Cloquet. "Cadmium isotopic evidence for the evolution of marine primary productivity and the biological extinction event during the Permian-Triassic crisis from the Meishan section, South China." Chemical Geology 481 (2018): 110–118.
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2017

Archer, C., M. B. Andersen, C. Cloquet, T. M. Conway, S. Dong, M. Ellwood, R. Moore, J. Nelson, M. Rehkämper, O. Rouxel et al. "Inter-calibration of a proposed new primary reference standard AA-ETH Zn for zinc isotopic analysis." Journal of Analytical Atomic Spectrometry 32 (2017): 145–149.
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Bickle, M., N. Kampman, H. Chapman, C. Ballentine, B. Dubacq, A. Galy, T. Sirikitputtisak, O. Warr,, M. Wigley et al. "Rapid reactions between CO2, brine and silicate minerals during geological carbon storage: Modelling based on a field CO2 injection experiment." Chemical Geology 468 (2017): 17–31.
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Emberson, R., A. Galy, and N. Hovius. "Combined effect of carbonate and biotite dissolution in landslides biases silicate weathering proxies." Geochimica et Cosmochimica Acta 213 (2017): 418–434.
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