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Par TIM Dernière modification 03/04/2015 19:17




  • Trace the sources of micronutrient to the Eastern Equatorial Pacific HNLC,area        
  • Trace the fluxes and processes of micronutrient sources in the Papua New Guinea area.


Scientific Rationale

The Eastern Equatorial Pacific is a High Nutrient Low Chlorophyll (HNLC) area. Primary production there is thought to be controlled, notably, by iron supply upwelled from the Equatorial Undercurrent flowing at around 200m depth all the way across the Pacific from the Papua New Guinea area (see the iron section below). Understanding the processes associated to these sources and transports was therefore essential to understand what drives primary production in the Eastern Equatorial Pacific.

3 LEGOS PhD students worked on theses samples. A. Radic and M. Labatut for Fe isotopes, and M. Grenier for Nd isotopes and Lagrangian trajectory modelling. This project is tightly linked to the SOLWARA project built between the LEGOS physic and geochemistry groups, focusing on the Salomon Sea, located just upstream of the areas studied in the ISOFERIX-EUCFe project.


Results and schedule

Iron isotopes have been measured in both the dissolved fraction and the suspended particles. The dissolved isotopic composition in the EUC all along the Equatorial section (not shown) displays the exact same value confirming the fact that the iron is transported all along that way without major alteration and that its source in the Eastern Equatorial Pacific is indeed the western Equatorial Pacific.


This project is now over. Its scientific thematic are pursued in the framework of the Solwara project.

Participants: F. Lacan, M. Labatut, C. Jeandel, M. Grenier, A. Radic, C. Venchiarrutti, C. Pradoux, J. Murray

Partners: LEGOS : University of Washington (Seattle, USA)

Fundings: NSF, INSU



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