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François Lacan

by François Lacan — last modified Apr 16, 2020 03:14 PM



François Lacan

CNRS Researcher at LEGOS


14 avenue Edouard BELIN



Email :                null

Téléphone :33 5 61 33 30 43


Background and mobility :

Research Director (DR2 CNRS) LEGOS, France, Oct. 2017 – present.

Researcher (CR1 CNRS) LEGOS, France, Oct. 2009 – Sept 17.

• Researcher (CR2 CNRS) LEGOS, France, Oct. 2005 – Sept 09.

• Post-Doctoral Fellow LSCE, France, Jan. 2005 – Sep. 2005.

• Post-Doctoral Fellow WHOI, USA, Feb. 2003 – Jun. 2004.

• Teaching assistant (part time) Toulouse III University, France, 2002.


Scientific interests :

Geochemistry applied to matter fluxes and water mass transports in the modern ocean. Multi-tracer approach. Hydrology. Modelling of geochemical tracers. Paleoceanography proxy calibration.

• Iron isotopes: origins of iron inputs to the ocean, role of the margins in the iron oceanic cycle.

• Neodymium isotopes: water mass circulation and mixing, terrigeneous inputs, dissolved-particulate exchanges.

• Thorium and Protactinium isotopes: deep water ventilation, scavenging, particulate fluxes.

• Cadmium isotopes: primary production, carbon fluxes, deep water ventilation.


Collective charges :

• Member of the national REGEF board (Réseau Géochimique et Expérimental Français; 2016 - 2018)

• Head of the Geochemistry group at LEGOS (Jan. 2011 - March 2020)

• Head of the OMP ICPMS facility board (2012 - 2020)

• Head of the Clean Lab facility at LEGOS (2005 - present)

• Member of the LEGOS Scientific Board (2016 - 2017)

• Elected member of the Scientific board of OMP (Observatoire Midi Pyrénées) (2009 - 2013)

• Member of the OMP ICPMS facility board (2006 - present)

• Member of the LEGOS computing board (2006 - 2018)

• Webmaster of the Geochemistry group at LEGOS (2010 - 2019)


Students and postdocs:

• PhD Students

L. Artigue (2016-2020)

E. Le Roy (2019-2019)

C. Abadie (2011-2014)

M. Labatut (2010-2013)

A. Radic (2007-2011)

• Postdocs

J. Klar (2016-2018)

Y. Zhang (2006-2008)

• Master 2 students

M. Labatut (2010)

• Master 1 students

M. Labatut (2009)



Cruises :

• GEOVIDE : R/V Pourquoi Pas ?, Ifremer, May June 2014, North Atlantic

• PANDORA : R/V Atalante, Ifremer, July August 2012, Solomon Sea.

• INDOMIX : R/V Marion Dufresne, IPEV, July 2010, Indonesia.

• BONUS-GOODHOPE : R/V Marion Dufresne, IPEV, Feb. Mar. 2008, South Africa - Southern Ocean.

• EUCFe - ISOFERIX : R/V Kilo Moana, Univ of Hawaii, Sept. Oct. 2006, Hawaii - Papua New Guinea.

• TIP2000 : (R/V Marion Dufresne, IFRTP, France, Sept. 2000, Indonesia - Australia.




• TONGA (ANR, PI. C. Guieu, LOV). 2019-2021.  Shallow hydroThermal sOurces of trace elemeNts along the Tonga Arc (Western South Pacific, GEOTRACES process study)

• INTERFERIC (LEFE, PI F. Lacan, LEGOS). 2019-2021. Dissolved particle interactions in the ocean studied with iron isotopes (Atlantic and Pacific)

• GEOVIDE (ANR, PI G. Sarthou, LEMAR). 2014-2018. GEOTRACES section in the North Atlantic (Portugal-Greenland-Newfoundland)

• IRONIC (IDEX, PI. F. Lacan, LEGOS). 2016-2018. Iron isotopes in the North Atlantic

• OPTIMISP (INSU, PI. F. Lacan, LEGOS). 2012. Optimization of In Situ Pumps.

• KEOPS2 (INSU-ANR, PI. S. Blain, LOMIC). 2011-2014. Kerguelen Ocean and plateau compared study 2.

• INDOMIX (INSU, PI. A. Koch-Larrouy, LEGOS). 2010-2012. Physical and geochemical transformations within the Indonesian throughflow.

• SOLWARA (INSU-ANR, PI. A. Ganachaud, LEGOS). 2008-2013. Physical and geochemical transformations within the Salomon Sea.

• GEOCAL (INSU, PI. F. Lacan, LEGOS). 2008-2010. A French contribution to the GEOTRACES intercalibration effort (Fe, Nd and Ra isotopes, 231Pa, 230Th)

BONUS-GOODHOPE (LEFE, ANR, PIs M. Boyé LEMAR, S. Speich LPO). 2007-2012. Interactions between the dynamic, circulation, biogeochemistry and geochemistry in the Atlantic sector of the Southern Ocean and its exchanges with the Indo-Atlantic connection.

• ISOFERIX (INSU, PI. F. Lacan, LEGOS). 2006-2008. ISOtopic tracing of Fe sources in the Equatorial Pacific: impact on new primary production and nitRogen fIXation (EUCFE cruise)

KEOPS (INSU, PI. S. Blain. LOB). 2005-2007. KErguelen :compared study of the Ocean and the Plateau in Surface water

• MOZAIQUE (INSU, PI. J-C Dutay, LSCE). 2006-2009. Modeling of trace elements in the ocean: Neodymium (Nd), Protactinium (Pa) and Thorium (Th)

• OceanicCdIC (WHOI, PI. R. Francois). 2003. Cadmium isotopic composition in the ocean

• SIGNATURE/GINS (INSU, PI C. Jeandel, LEGOS). 1999-2002. Neodymium isotopic composition in the North Atlantic



Skills :

• Trace element chemistry (notably in seawater). Preconcentration, purification (ion chromatography), mineralization (notably microwave);

• Mass spectrometry : quadrupole ICPMS (Agilent 7500CE), triple quadrupole ICPMS (Thermo iCAP TQ), magnetic sector high resolution ICPMS (Thermo Element XR), multi collection ICPMS (Thermo Neptune Plus),and Thermo Ionization MS (Thermo Finnigan MAT 261), isotopic dilutions, double spiking, interference corrections, sensitivity corrections, mass bias corrections;

• Atomic Absorption;

• Seawater sampling (trace metals, suspended particles, in situ pumps...);

• Core sampling. Pore water sampling.

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