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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


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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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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Gou, L. F., Z. Jin, A. Galy, H. Sun, L. Deng, and Y. Xu. "Effects of cone combinations on accurate and precise Mg‐isotopic determination using multi‐collector inductively coupled plasma mass spectrometry." Rapid Communications in Mass Spectrometry 33 (2019): 351–360.
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Gou, L. F., Z. Jin, P. A. E. Pogge von Strandmann, G. Li, Y. X. Qu, J. Xiao, L. Deng, and A. Galy. "Li isotopes in the middle Yellow River: Seasonal variability, sources and fractionation." Geochimica et Cosmochimica Acta 248 (2019): 88–108.
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Ruan, X., Y. Yang, A. Galy, X. Fang, Z. Jin, F. Zhang, R. Yang, L. Deng, Q. Meng, C. Ye et al. "Evidence for early (≥12.7 Ma) eolian dust impact on river chemistry in the northeastern Tibetan Plateau." Earth and Planetary Science Letters 515 (2019): 79–89.
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Yang, R., Y. Yang, X. Fang, X. Ruan, A. Galy, C. Ye, Q. Meng, and W. Han. "Late miocene intensified tectonic uplift and climatic aridification on the northeastern Tibetan plateau: Evidence from clay mineralogical and geochemical records in the Xining Basin." Geochemistry Geophysics Geosystems G3 20 (2019).
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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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Boucher, C., T. Lan, B. Marty, P. G. Burnard, T. P. Fischer, D. Ayalew, J. Mabry, J. M. de Moor, M. E. Zelenski, and L. Zimmermann. "Atmospheric helium isotope composition as a tracer of volcanic emissions: A case study of Erta Ale volcano, Ethiopia." Chemical Geology 480 (2018): 3–11.
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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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Dellinger, M., A. J. West, G. Paris, J. F. Adkins, P. A. E. Pogge von Strandmann, C. V. Ullmann, R. A. Eagle, P. Freitas, M. L. Bagard, J. B. Ries et al. "The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms." Geochimica et Cosmochimica Acta 236 (2018): 315–335.
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