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ISTeP - UMR 7193
Institut des Sciences de la Terre de Paris

Hermoso Michaël



UPMC - Campus Jussieu - Tour 56-55, 5e étage - Case courrier 116

Tél : 01 44 27 49 95 -

Thèmes de recherche

My research intererests center around palaeoceanography and biogeochemistry of the marine calcifiers. I am currently interested in developping a mechanistic understanding of stable isotopes in coccolithophores in order to unlock a part of the information contained in the geological record and derive actual (i.e., “vital effect-free”) variations of the chemistry of seawater in the past. The coccolithophores are unicellular marine algae living in the surface of the oceans. These calcifying and photosynthetic organisms have an influential role on the exchange of carbon dioxide between the atmosphere and the ocean and are responsible for a large part of the carbon drawdown to the seafloor. In the laboratory, it is possible to reproduce a range of environmental conditions and investigate the effect of the changes in the chemical composition of the biominerals and measure the intensity of the biological-induced fractionation of stable isotopes in coccoliths. Identifying what causes this vital effect will help developing a quantitative approach. Once such a calibration between extracellular parameters and the geochemistry of the mineralisation is obtained, I will test the outcomes pertaining the biogeochemistry of these organisms against the climatic variability of natural environment both geographically and temporally. These new constrains will also be relevant for predicting the response of the oceanic carbonate system to future climate changes because the behaviour of the surface ocean is a key parameter used for most climatic models.

Bibliographie récente

- Hermoso M., Lefeuvre B., Minoletti F. and de Rafélis M., 2017. Extreme strontium concentrations reveal specific biomineralization pathways in certain coccolithophores with implications for the Sr/Ca paleoproductivity proxy. PloS ONE, 12, e0185655, doi:10.1371/journal.pone.0185655.

- Katz A., Bonifacie M., Hermoso M., Cartigny P.  and Calmels D., 2017. Laboratory-grown coccoliths exhibit no vital effect in clumped isotope (Δ47) composition on a range of geologically relevant temperatures. Geochim. Cosmochim. Acta, 208, 335-353, doi:10.1016/j.gca.2017.02.025.

-  McClelland, H.L.O, Bruggeman, J., Hermoso, M. and Rickaby, R.E.M., 2017. The origin of carbon isotope vital effects in coccolith calcite. Nature Communications, 8, 14511, doi:10.1038/ncomms14511.

-  Tremblin M., Hermoso M. and Minoletti F., 2016. Equatorial heat accumulation as a long-term trigger to permanent Antarctic ice-sheets during the Cenozoic. Proc. Nat. Acad. Sciences, 113, 11782-1787, doi:10.1073/pnas.1608100113.

-  McClelland, H.L.O, Barbarin, N., Beaufort, L., Hermoso, M., Ferretti, P., Greaves, M. and Rickaby, R.E.M., 2016. Calcification response of a key phytoplankton family to millennial-scale environmental change. Nature Scientific Reports, 6, 34263, doi:10.1038/srep34263.

Hermoso, M. (2016). Isotopic record of Pleistocene glacial / interglacial cycles in pelagic carbonates: Revisiting historical data from the Caribbean Sea. Quaternary Science Reviews, 137, 69-78, doi:10.1016/j.quascirev.2016.02.003.

-  Rickaby R. E. M., Hermoso M., Lee R. B. Y., Rae B. D., Heureux A. M. C., Balestreri C., Chakravarti L., Schroeder D. and Brownlee C., 2016. Environmental carbonate chemistry selects for phenotype of recently isolated strains of Emiliania huxleyiDeep. Res. Part II 127, 28–40, doi:10.1016/j.dsr2.2016.02.010.

Hermoso M., Minoletti F., Aloisi G., Bonifacie M., McClelland H. L. O., Labourdette N., Renforth P., Chaduteau C. and Rickaby R. E. M., 2016. An explanation for the 18O excess in Noelaerhabdaceae coccolith calcite. Geochim. Cosmochim. Acta 189, 132–142, doi:10.1016/j.gca.2016.06.016.

Hermoso, M., Chan, I.Z.X., McClelland, H.L.O., Heureux, A.M.C. and Rickaby, R.E.M. (2016). Vanishing coccolith vital effects with alleviated carbon limitation. Biogeosciences, 13, 301-312, doi:10.5194/bg-13-301-2016.

Hermoso, M. and Hesselbo, S.P. (2016). Comment on ‘New insights in the pattern and timing of the Early Jurassic calcareous nannofossil crisis’ by M. E. Clemence et al. [Palaeogeography Palaeoclimatology Palaeoecology 427 (2015) 100-108]. Palaeogeography, Palaeoclimatology, Palaeoecology, 457, 422-423, doi: 10.1016/j.palaeo.2015.12.005.

Hermoso, M. (2015). Control of ambient pH on growth and stable isotopes in phytoplanktonic calcifying algae. Paleoceanography, 30, 1100-1112, doi:10.1002/2015PA002844.

-  Percival, L.M.E., Witt, M.L., Mather, T.A., Hermoso, M. et al. (2015). Globally enhanced mercury deposition during the end-Pliensbachian extinction and Toarcian OAE: A link to the Karoo-Ferrar Large Igneous Province. Earth and Planetary Science Letters, 428, 267-280, doi:10.1016/j.epsl.2015.06.064.

Hermoso, M., Candelier, Y., Browning, T.J. and Minoletti, F. (2015). Environmental control of the isotopic composition of subfossil coccolith calcite: Are laboratory culture data transferable to the natural environment? GeoResJ, 7, 35-42, doi:10.1016/j.grj.2015.05.002.

Hermoso, M. (2014). Coccolith-derived isotopic proxies in palaeoceanography: where geologists need biologists [Review article]. Cryptogamie, Algologie, 35, 323-352, doi:10.7872/crya.v35.iss4.2014.323.

-  Minoletti, F., Hermoso, M., Candelier, Y. and Probert I. (2014). Calibration of stable isotope composition of Thoracosphaera heimii (dinoflagellate) calcite for reconstructing paleotemperatures in the intermediate photic zone. Paleoceanography, 29, 1111-1126, doi:10.1002/2014PA002694.

Hermoso, M., Horner, T.J., Minoletti, F. and Rickaby, R.E.M. (2014). Constraints on the vital effect in coccolithophore and dinoflagellate calcite by oxygen isotopic modification of seawater. Geochimica et Cosmochimica Acta, 141, 612-627, doi.10.1016/gca.2014.05.002.

Hermoso, M., Delsate, D., Baudin, F., Le Callonnec, L., Minoletti, F., Renard, M. and Faber, A. (2014). Record of Early Toarcian carbon cycle perturbations in a nearshore environment: the Bascharage section (eastermost Paris Basin). Solid Earth, 5, 793-804, doi.10.5194/se-5-793-2014.

Hermoso, M. and Pellenard, P. (2014). Continental weathering and climatic changes inferred from clay mineralogy and paired carbon isotopes across the early to middle Toarcian in the Paris Basin. Palaeogeography, Palaeoclimatology, Palaeoecology, 399, 385-393, doi.10.1016/j.palaeo.2014.02.007.

-  Stevenson, E.I., Hermoso, M., Rickaby, R.E.M., Tyler, J.J., Minoletti, F., Parkinson, I.J., Mokadem, F. and Burton, K.W. (2014). Controls on Stable strontium isotope fractionation in coccolithophores with implications for the marine Sr cycle. Geochimica et Cosmochimica Acta, 128, 225-235, doi.10.1016/gca.2013.11.043.

Hermoso, M., Minoletti, F. and Pellenard, P. (2013). Black shale deposition during Toarcian super-greenhouse driven by sea level. Climate of the Past, 9, pp. 2703-2712,  doi.10.5194/cp-9-2703-2013.

-  Candelier, Y., Minoletti, F., Probert, I. and Hermoso, M. (2013). Temperature dependence of oxygen isotope fractionation in coccolith calcite: A culture and core top calibration of the genus Calcidiscus. Geochimica et Cosmochimica Acta, 100, pp. 264-281,


Géosciences 1 (1T001).

Bases de sédimentologie (2T403).

Environnements sédimentaires (3T305).


Member of the UMR 7193 management council.


Principal Investigator for the ANR-funded project ‘CARCLIM’ (2018-2020) – More info to follow in the near future.



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    L'ISTeP comprend 141 membres dont :

    • 15 professeurs
    • 25 maîtres de conférences
    • 2 directeurs de recherche
    • 4 chargés de recherche
    • 10 ATER et post-docs
    • 42 doctorants
    • 24 ITA-IATOS
    • 19 collaborateurs bénévoles (dont 10 émérites)