Stéphane Audry

PhD, Physicien-Adjoint (CNAP) à Géosciences Environnement Toulouse (GET) – Observatoire Midi-Pyrénées (OMP), Toulouse (France)


Phone : +33 (0)5 61 33 26 05
Fax : +33 (0)5 61 33 25 60
E-mail :

Main Research Interests

  • Trace element cycles in aquatic systems
  • Transport and processes at the water-sediment interface
  • Early diagenesis
  • Sedimentary recording of anthropogenic pollution
  • Chemical partitioning of trace metals in suspended particles and sediment
  • Trace metal partitioning between dissolved and particulate phases

 Field and Analytical Skills

  • Automatic samplers for water and suspended particle sampling
  • Interface sediment coring
  • In-situvoltametric microelectrodes
  • Spectrophotometry


  1. Buvaneshwari, S., Riotte, J., Ruiz, L., Sekhar, M., Mohan K., Mandalagiri S., Sharma, A. K., Duprey, J-L., Audry, S., Praveen, Y., Hemanth, M., Durand, P., Braun, J-J. (2017) High spatial variability of nitrate contamination in the hard rock aquifer of an irrigated catchment: Implications for water resource assessment. Sci. Tot. Environ., 579, 838-847
  2. Alanoca, S., Guédron, S., Amouroux, D., Audry, S.,  Monperrus, M., Tessier, E., Goix, S., Acha, D., Seyler, P., Point, D. (2016) Synergistic effects of mining and urban effluents on the level and distribution of methylmercury in a shallow aquatic ecosystem of the Bolivian Altiplano. Environ. Sci. Process. Impacts, 18, 1550-1560
  3. Alanoca, L., Amouroux, D., Montperrus, M., Tessier, E., Goni, M., Guyoneaud, R., Acha, M., Gassie, C., Audry, S., Garcia, M., Quintanilla, J., Point, D. (2016) Diurnal variability and biogeochemical reactivity of mercury species in an extreme high altitude lake ecosystem of the Bolivian Altiplano. Environ. Sci. Poll. Res., 23, 6919-6933
  4. Gurumurthy, G.P., Balakrishna, K., Tripti, M., Riotte, J., Audry, S., Braun, J.-J., Udaya Shankar, H.N. (2015) Use of Sr isotopes as a tool to decipher the soil weathering processes in a tropical river catchment, Southwestern India Appl. Geochem., 63, 498–506
  5. Gurumurthy, G.P., Balakrishna, K., Tripti, M., Riotte, J., Audry, S., Braun, J.-J., Lambs, L., Udaya Shankar, H.N. (2015) Sources of major ions and processes affecting the geochemical and isotopic signatures of subsurface waters along a tropical river, Southwestern India. Earth Sci., 73, 333-346
  6. Akerman, A., Poitrasson, F., Oliva, P., Audry, S., Prunier, J., Braun, J.-J. (2014) The isotopic fingerprint of Fe cycling in an equatorial soil–plant–water system: The Nsimi watershed, South Cameroon. Chem. Geol., 385, 104-116
  7. Gurumurthy, G.P., Balakrishna, K., Tripti, M., Riotte, J., Audry, S., Braun, J.-J., Lambs, L., Udaya Shankar, H.N. (2014) Sources of major ions and processes affecting the geochemical and isotopic signatures of subsurface waters along a tropical river, Southwestern India. Environ. Earth Sci., 1-14.
  8. Audry, S., Akerman, A., Riotte, J., Oliva, P., Maréchal, J.C., Fraysse, F., Pokrovsky, O.S., Braun, J.J. (2014) Contribution of forest fire ash and plant litter decay on stream dissolved composition in a sub-humid tropical watershed (Mule Hole, Southern India). Chem. Geol., 372, 144-161
  9. Gurumurthy, G. P., Balakrishna, K., Tripti, M., Audry, S., Riotte, J., Braun, J.J., H. N. Udaya Shankar (2013) Geochemical behaviour of dissolved trace elements in a monsoon-dominated tropical river basin, Southwestern India.Environ. Sci. Poll. Res., 21, 5098-5120
  10. Shirokova, L.S., Pokrovsky, O.S., Kirpotin, S.N., Desmukh, C., Pokrovsky, B.G., Audry, S., Viers, J. (2013). Biogeochemistry of organic carbon, CO2, CH4, and trace elements in thermokarst water bodies in discontinuous permafrost zones of Western Siberia. Biogeochemistry, 113, 573-593.
  11. Tapia J. and Audry, S. (2013) Control of early diagenesis processes on trace metals (Cu, Zn, Cd, Pb and U) and metalloids (As, Sb) behaviors in mining- and smelting-impacted lacustrine environments of the Bolivian Altiplano. Appl. Geochem. 31, 60-78
  12. Braun, J.J., Maréchal, J.C., Riotte, J., Boeglin, J.L., Bedimo Bedimo, J.P., Ndam Ngoupayou, J.R., Nyeck, B., Robain, H., Sekhar, M., Audry, S., Viers, J. (2012) Elemental weathering fluxes and saprolite production rate in a Central African lateritic terrain (Nsimi, South Cameroon). Geochim. Cosmochim. Acta, 99, 243–270.
  13. Pokrovsky, O.S., Viers, J., Dupré, B., Chabaux, F., Gaillardet, J., Audry, S., Prokushkin, A.S., Shirokova, L.S., Kirpotin, S.N., Lapitsky, S.A., Shevchenko, V.P. (2012) Biogeochemistry of carbon, major and trace elements in watersheds of northern Eurasia drained to the Arctic Ocean: The change of fluxes, sources and mechanisms under the climate warming prospective. C. R. Geosci., 344, 663–677.
  14. Gurumurthy, G.P., Balakrishna, K., Riotte, J., Braun, J-J., Audry, S., Udaya Shankara, H.N., Manjunatha, B.R. (2012) Controls on intense silicate weathering in a tropical river, southwestern India.Chem. Geol., 300-301, 61–69
  15. Pokrovsky, O.S. , Shirokova, L.S., Zabelina, S.A., Vorobieva, T. Ya., Moreva, O. Yu., Klimov, S. I., Chupakov, A.V., Shorina, N. V., Kokryatskaya, N. M., Audry, S., Viers, J., Zoutien, C., Freydier, R. (2012) Size fractionation of trace elements in a seasonally stratified boreal lake: Control of organic matter and iron colloids.Aquat. Geochem.18, 115-139.
  16. Tapia, J., Audry, S., Townley, B., Duprey, J.L. (2012) Geochemical background, baseline and origin of trace metals and metalloids from lacustrine sediments in the mining-impacted Altiplano and Eastern Cordillera of Oruro, Bolivia.Geochem. Explor. Environ. Anal., 12, 3-20.
  17. Audry., S., Pokrovsky, O. S., Shirokova, L. S., Kirpotin, S. N., Dupré, B. (2011) Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments.Biogeosciences, 8, 3341–3358.
  18. Lanceleur, L., Schäfer, J., Chiffoleau J-F., Blanc, G., Auger, D., Renault, S., Baudrimont, M., Audry, S. (2011) Long-term records of cadmium and silver contamination in sediments and oysters from the Gironde fluvial–estuarine continuum – Evidence of changing silver sources. Chemosphere, 85, 1299-1305
  19. Siva Soumya, B., Sekhar, M., Riotte, J., Audry, S., Lagane, C., Braun, J.J. (2011) Inverse models to analyze the spatiotemporal variations of chemical weathering fluxes in a granito-gneissic watershed: Mule Hole, South India. Geoderma, 165, 12-24.
  20. Maréchal, J.C., Riotte, J., Lagane, C., Subramanian, S., Kumar, C., Ruiz, L., Audry, S., M.R.R. Varma, Braun, J.J. (2011) Deep groundwater flow as the main pathway for chemical outputs in a small headwater watershed (Mule Hole, South India). Appl. Geochem., 26, S94–S96
  21. Pokrovsky, O. S., Shirokova, L. S., Kirpotin, S. N., Audry, S., Viers, J., and Dupré, B. (2011) Effect of permafrost thawing on organic carbon and trace element colloidal speciation in the thermokarst lakes of western Siberia. Biogeosciences, 8, 565-583, doi:10.5194/bg-8-565-2011
  22. Sonke, J.E., Schäfer, J., Chmeleff, J., Audry, S., Blanc, G., Dupré, B. (2010) Sedimentary mercury stable isotope records of atmospheric and riverine pollution from two major European heavy metal refineries. Chem. Geol., 279, 90-100
  23. Audry, S., Grosbois, C., Bril H., Schäfer J., Kierczak J., Blanc G. (2010) Post-depositional redistribution of trace metals in reservoir sediments of a mining/smelting-impacted watershed (the Lot River, SW France).Appl. Geochem., 25, 778–794.
  24. Sivry, Y.,  Riotte, J., Sonke, J.E., Audry, S., Schäfer, J.,  Viers, J.,  Blanc, G., Freydier, R. Dupré, B. (2008) Zn isotopes as tracers of anthropogenic pollution from Zn-ore smelters. The Riou Mort-Lot River system. Chem. Geol., 255, 295-304
  25. Audry, S., Blanc, G., Schäfer, J., Guérin, F., Masson, M., Robert, S. (2007) Behavior and budget of Mn, Cd and Cu in a macrotidal estuary: The Gironde estuary (SW France). Mar. Chem., 107, 433–448
  26. Audry, S., Blanc, G., Schäfer, J., Robert, S. (2007) Effect of estuarine sediment resuspension on early diagenesis, sulfide oxidation and dissolved molybdenum and uranium distribution. Chem. Geol., 238, 149-167
  27. Castelle, S., Schäfer, J., Blanc, G., Audry, S., Etcheber, H., Lissalde, J. P. (2007) Solid speciation and sedimentary record of mercury in natural and contaminated reservoir sediment: the case of the Lot River (France). Appl. Geochem., 22, 1359-1370
  28. Schäfer, J., Blanc, G., Audry, S., Cossa D,Bossy, C. (2006) Mercury in the Lot-Garonne River system (France): Sources, fluxes and anthropogenic component. Appl. Geochem., 21, 515-527
  29. Audry, S., Blanc, G., Schäfer, J., Chaillou, G., Robert, S. (2006) Early diagenesis of trace metals (Cd, Cu, Co, Ni, U, Mo, V) in the freshwater reaches of a macrotidal estuary. Geochim. Cosmochim. Acta, 70, 2264-2282
  30. Audry, S., Blanc, G., Schäfer, J. (2006) Solid state partitioning of trace metals in suspended particulate matter from a river system affected by smelting waste drainage, Sci. Tot. Environ., 363, 216-236
  31. Audry, S., Blanc, G., Schäfer, J. (2005) The impact of sulphide oxidation in a smelting-waste area on dissolved heavy metal (Cd, Zn, Cu, Cr, Co, Ni, U) inputs into the Lot-Garonne fluvial system (France).Appl. Geochem.20, 919-931.
  32. Audry, S., Schäfer, J., Blanc, G., Jouanneau, J.M. (2004). Fifty-year sedimentary record of heavy metal pollution (Cd, Zn, Cu, Pb) in the Lot River reservoirs (France). Environ. Pollut., 132, 413-426.
  33. Audry, S., Schäfer, J., Blanc, G., Bossy, C., Lavaux, G. (2004). Anthropogenic components on heavy metal (Cd, Zn, Cu, Pb) budgets in the Lot-Garonne fluvial system (France). Appl. Geochem., 19, 269-286.
  34. Audry, S., Blanc G., Schäfer, J. (2004). Cadmium transport in the Lot-Garonne River system (France) – temporal variability and model for flux estimation. Sci. Tot. Environ., 319, 197-213.
  35. Blanc, G., Kastner, M., Lückge, A., Silver, E., Audry, S. and the scientific party (1999). Fluid flow and complete subduction of the Cocos plate sediments (Leg ODP 170). C. R. Acad. Sci.Paris, Sciences de la terre et des planètes/Earth and Planetary Sciences, 329, 117-123.