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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 : Arbia Jouini (2018-2021) Xiaobai Ruan (2018-2021) 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


Barkan, Y., G. Paris, S. M. Webb, J. F. Adkins, and I. Halevy. "Sulfur isotope fractionation between aqueous andcarbonate-associated sulfate in abiotic calcite and aragonite." Geochimica et Cosmochimica Acta 280 (2020): 317–339.
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Labidi, J., P. H. Barry, D. V. Bekaert, M. W. Broadley, B. Marty, T. Giunta, O. Warr, B. S. Sherwood, T. P. Fischer, G. Avice et al. "Hydrothermal 15N15N abundances constrain the origins of mantle nitrogen." Nature 580 (2020): 367–371.
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Lénard, S., J. Cruz, C. France-Lanord, J. Lavé, and B. T. Reilly. "Data report : calcareous nannofossils and lithologic constraints on the age model of IODP Site U1450, Expedition 354, Bengal Fan." Proceedings of the International Ocean Discovery Program 354 (2020): 1–5.
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Palacios, D., C. R. Stokes, F. M. Philipps, J. J. Clague, J. Alcala-Reygosa, N. Andres, I. Angel, and P. H. et al. Blard. "The deglaciation of the Americas during the Last Glacial Termination." Earth-Science Reviews 203 (2020).
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Paris, G., W. W. Fischer, J. E. Johnson, S. M. Webb, T. M. Present, A. L. Sessions, and J. F. Adkins. "Deposition of sulfate aerosols with positive D33S in the Neoarchean." Geochimica et Cosmochimica Acta 285 (2020): 1–20.
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Balco, G., P. H. Blard, D. L. Shuster, J. O. H. Stone, and L. Zimmermann. "Cosmogenic and nucleogenic 21Ne in quartz in a 28-meter sandstone core from the McMurdo Dry Valleys, Antarctica." Quaternary Geochronology 52 (2019): 63–76.
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Bastian, L., N. Vigier, M. Revel, G. Yirgu, D. Ayalew, and R. Pik. "Chemical erosion rates in the upper Blue Nile Basin and related atmospheric CO2 consumption." Chemical Geology 518 (2019): 19–31.
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Blard, P. H., M. Lupker, M. Rousseau, and J. Tesson. "Two MATLAB programs for computing paleo-elevations and burial ages from paired-cosmogenic nuclides." MethodsX 6 (2019): 1547–1556.
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Cadet, M., T. Sayavongkhamdy, V. Souksavatdy, T. Luangkhoth, P. Dillmann, C. Cloquet, J. Vernet, P. Piccardo, N. Chang, J. Edgar et al. "Lao's central role in Southeast Asian copper exchange networks: A multimethod study of bronzes from the Vilabouly Complex." Journal of Archaeological Science 109 (2019).
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Flahaut, J., J. L. Bishop, S. Silvestro, D. Tedesco, I. Daniel, and D. Loizeau. "The Italian Solfatara as an analog for Mars fumarolic alteration." American Mineralogist 104 (2019): 1565–1577.
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