Chargé de Recherche (Scientist), Institut de Recherche pour le Développement (IRD)
Geochemist
Indo-French Cell for Water Sciences (IFCWS)
Indian Institute of Science
560012 Bangalore, India
 : +91 80 23 60 02 97 / +91 99 02 07 35 70
 : jean.riotte@get.obs-mip.fr
 Dynamics of weathering processes and biogeochemical cycles at various spatial and temporal scales. Use of natural tracers such as major and trace elements; Sr, Si, U-Th isotopes
 U-Th dating in surface environment
 Analytical development : U-Th-Ra isotopes on MC-ICPMS and TIMS, Ge on HR-ICPMS
 Metallic pollution : Quantification of metallic exchangeable pool in soil and river particles (Cd, Zn, P, U, Th, Sr…),
Isotopic tracing (  66 Zn) of Zn pollution
2003-present: Scientist at IRD (Research Institute for Development) at the UMR Geosciences Environnement
Toulouse, Observatoire Midi-Pyrénées, Toulouse, France.
From 2005 to 2010 and from April 2012: deputed at the Indo-French Cell for Water Sciences (IFCWS), Indian
Institute of Science, Bangalore, India.
2002: Post-doctoral position at the Louis Pasteur University, Strasbourg (ULP), France.
2001: PhD at the Centre de Géochimie de la Surface, EOST, ULP, Supervisor François Chabaux, on “Study of 234 U238 U disequilibrium in river waters: the Strengbach (France), the Mount Cameroon and the Ganga-Brahmaputra system”.
2003- : SO BVET = Hydrological, geochemical and climatic monitoring of experimental watershed in the Tropics: The
Kabini (South India) and the Nyong (Cameroon) watersheds. This Environmental Observatory is funded by IRD,
INSU, Paul Sabatier University. PIs J. Riotte and S. Audry. Collaboration with the Indian Institute of Science and
Yaoundé-I University (Cameroon).
2013-16: Adaptation of Irrigated Agriculture to Climate Change (AICHA ), Funded by IFCPAR/CEFIPRA, PIs M. Sekhar and Ruiz L.
2012-13: Biogeochemical cycling of silica in tropical Environment (BIOSITE), French National Program EC2CO (INSU),
P.I. S. Audry.
2010-11: Holocene climate fluctuations in South India, links with vegetation. French National Program EC2CO (INSU),
P.I. J. Riotte.
2006-07: Development of the Radium isotopes measurement on MC-ICP-MS. ASUPS BQR program (Paul Sabatier
University, P.I. P. Van Beek (LEGOS) and J. Riotte.
2003-07: Survey of the metallic pollution in the Lot River (France). French National Program (ECCO-PNBC, INSU), P.I.
G. Blanc (EPOC, Bordeaux).
2003-05 and 2006-07: Integrated study of the Kabini watershed (South India): Influence of environmental factors on weathering processes and hydro-biogeochemical transfers. French National Program (ECCO PNRH, INSU) P.I. J.J.
Braun and J. Riotte. Collaboration with the Indian Institute of Science (Bangalore, India), CEREGE (Marseille), LTHE
(Grenoble), LA (Toulouse).

Audry S., Akerman A., Riotte J., Oliva P., Maréchal J.C., Fraysse F., Pokrovsky O., 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.
Braun J.J., Maréchal J.C., Riotte J., Boeglin J.L., Bedimo Bedimo J.P., Ndam J.R., Nyeck B., Robain H. and Viers J.
(2012) Elemental weathering fluxes in a Central African lateritic terrain (Nsimi, South Cameroon). Geochim.
Cosmochim. Acta, 99, 243-270.
Gurumurthy G.P., Balakrishna, K., Riotte J., Braun J.J., Audry S., Udaya Shanka H.N., Manjunatha B.R. (2012) Controls on intense silicate weathering in a tropical river, southwestern India. Chem. Geol. 300, 61-69.
Sivry Y., Riotte J., Sappin-Didier V., Munoz M., Redon P. O., Denaix L., Dupré B. (2011) Multielementary (Cd, Cu, Pb,
Zn, Ni) stable isotopic exchange kinetic (SIEK) method to characterize polymetallic contaminations. Environmental
Science and Technology, 45, 6247-6253.
Violette A., Riotte J., Braun J.J., Oliva P., Maréchal J.C., Sekhar M., Jeandel C., Subramanian S., Barbiero L. and
Dupré B. (2010b) Formation and preservation of pedogenic carbonates in South India, links with paleomonsoon and pedological conditions: Clues from Sr isotopes, U-Th series and REEs, Geochim. Cosmochim. Acta 74, 7059-7085.
Violette A., Goddéris G., Maréchal J.M., Riotte J., Oliva P., Mohan Kumar M.S., Sekhar M., Braun J.J. (2010a) Modelling the chemical weathering fluxes at the watershed scale in the Tropics (Mule Hole, South India): Relative contribution of the smectite/kaolinite assemblage versus primary minerals. Chem. Geol, 277, 42-60
Journals: Geochimica et Cosmochimica Acta, Earth and Planetary Science Letters, CR Géosciences, Geostandards and Geoanalytical Research, Journal of Environmental Management, Hydrogeology Journal, Atmospheric Environment.
French National programs: SYSTER, MISTRALS
2012-15: Participation in the PhD of S. Buvaneshwari (Guide: Pr M. Sekhar, IISc) on Nitrate cycling in the Berambadi watershed.
2011-12: Participation in the PhD of Gurumurthy G.P. (Guide: Pr Balakrishna, Manipal) on the controls of the weathering fluxes in the Nethravathi River.
2004-2008: PhD co-supervisor of Yann Sivry, UPS Toulouse with B. Dupré (CNRS) on the use of metallic stable isotopes as tracers of anthropogenic pollution and for quantifying the labile pool of ETM.
2002-2013: guidance or co-guidance of 10 Master students
Lecturer from 1996 to 2002 at the Louis Pasteur University, Strasbourg, BSc and Master degrees
- Introduction to Geochemistry and Isotopic Geochemistry
- Field trips in Geology (Vosges-Alsace, Mont Saint-Michel Bay, French Alps)
- Methods for Earth’s material studies (X-ray diffraction, SEM, TEM)
- Mineralogy and Petrography
PhD award from the Conseil Général du Haut Rhin, Strasbourg, in 2002.
From 2011, Member of the Scientific council of the UMR GET (Toulouse)
From 2006, Member of the Scientific committee of the TIMS at GET
From 2005, Responsible for the analytical platform at the IFCWS (IISc, Bangalore)