New GEOTRACES Data Manager

Mohamed Adjou 

We are pleased to inform you that Dr. Mohamed Adjou has joined the GEOTRACES Data Assembly Centre (GDAC) in the role of GEOTRACES Data Manager.

Dr. Mohamed Adjou has a background in Marine and Climate Sciences (Marine Science Engineer and Climate-Environment Interaction MSc) and hold his PhD in Chemical Oceanography from University of Brest under the supervision of Prof. Paul Treguer. After his PhD he worked as a Postdoctoral Researcher at the University of Copenhagen in close collaboration with Prof. Katherine Richardson on marine ecosystems feedback to environmental forcing using data modelling and observations. The multidisciplinary interest of Mohamed in marine data modelling, data management and software development drove him to develop his skills and to work in this field.

When communicating with Mohamed please use the generic GDAC email account:

Welcome on board Mohamed!

The U.S. cruise along the GEOTRACES GP15 section in the Pacific Ocean will depart soon

The U.S. GEOTRACES GP15 cruise will be conducted in the Pacific Ocean along 152° W between Alaska and Tahiti (see map below) from 18 September to 24 November 2018. It aims at examining the influence of strong margin fluxes, atmospheric dust deposition, and the distal ends of hydrothermal plumes from the Juan de Fuca Ridge and East Pacific Rise as well as oxygen minimum zones, equatorial upwelling, and some of the lowest-nutrient waters in the world’s oceans in the South Pacific gyre at 20°S. The cruise will be the first meridional section of the U.S. GEOTRACES programme, and indeed, this transect would allow to explore virtually all of the processes and fluxes known to introduce trace elements to the ocean.

GP15 cruise trackThis project would also provide baseline measurements of trace elements in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on trace elements in the water column is one that could be uniquely assessed by the GEOTRACES community.

This cruise will support a large variety of individual science projects to study the chemical and biological interactions of trace elements, with some research being conducted on board the ship, and additional research at participating academic laboratories (please see the GP15 collaborators web page). In total, 45 researchers will participate in this cruise.

Want to learn more about this cruise?


Postdoctoral Scholar in Experimental Chemical Thermodynamics of Seawater, Scripps Institution of Oceanography, USA

Postdoctoral Scholar in Experimental Chemical Thermodynamics of Seawater (Scripps Institution of Oceanography)

The postdoctoral scholar will participate in laboratory measurements involved in better defining marine ‘pH’, and in quantifying chemical speciation in seawater media, including measurement of thermodynamic properties of aqueous solutions using both established reference methods (Harned Cells), and new approaches (using a differential scanning calorimeter). The majority of the postdoctoral scholar's effort will focus on making thermodynamic measurements in salt solutions that are needed to provide well-constrained parameters for a chemical speciation model for natural waters based upon the "Pitzer" equations. The overall aim of this project and its co-funded element in the U.K. is to create a step change in the capability of scientists to measure, interpret, and predict chemical speciation and pH in natural waters of varying composition. The activities of the project as a whole are closely related to those of SCOR Working Group 145 Modelling Chemical Speciation in Seawater to Meet 21st Century Needs.

For more information, please contact Andrew Dickson.

Postdoc in Marine Metals Science, University of Southern California, USA

The John Lab at the University of Southern California is seeking a Postdoctoral Researcher to study metal biogeochemistry in the North Pacific Subtropical Gyre. There is significant flexibility in the specific topic of research…what seems most exciting to you? Potential areas of study include the impact of metals on viral infection dynamics, molecular biology techniques to decipher in situ biological influences on metal and metal isotope cycling, and modeling metal-biological interactions in the North Pacific and beyond. More information about ongoing research is available online at Applicants may send a CV and brief discussion of research interests to

Catherine Jeandel, IPO science director, elected AGU Fellow

We are really very pleased to announce that Catherine Jeandel, GEOTRACES IPO Science Director, has been elected as AGU Fellow!

Congratulations Catherine!!!

GEOTRACES papers are amongst the most highly cited in Limnology and Oceanography: Methods

The journal Limnology and Oceanography: Methods published by the Association for the Sciences of Limnology and Oceanography (ASLO) is celebrating its 15th year of publication. To celebrate this event, they have published a collection of the most highly cited or downloaded papers – two from each year of publication (2002 to 2017):

Significantly, two of the 30 papers are GEOTRACES-related and appeared in L&O Methods’ special issue, Intercalibration in Chemical Oceanography (, that was based on the 2008-2009 GEOTRACES Intercalibration Cruises:

  • Cutter, G.A. and K. W. Bruland. 2012. Rapid and non-contaminating sampling system for trace elements in global ocean surveys. Limnol. Oceanogr. Methods, 10: 425-436.
  • Morton, P. et al. 2013. Methods for the sampling and analysis of marine aerosols: results from the 2008 GEOTRACES aerosol intercalibration experiment. Limnol. Oceanogr. Methods, 11: 62-78.

 Data Product (IDP2017)


 Data Assembly Centre (GDAC)


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