April 2021 - Issue #44
GEOTRACES Science Highlights
Deep sea lithogenic weathering a source of iron colloids for the ocean
Homoky and co-workers determined the isotope composition of dissolved iron profiles in shallow surface sediments of the South Atlantic Uruguayan margin...


Adding external sources allow a better simulation of the oceanic rare earth elements cycles
Oka and colleagues demonstrate that the global distribution of REE can be reproduced by considering the internal cycle associated with reversible scavenging and external REEs inputs around continental regions.


First direct measurements of luxury iron uptake in natural phytoplankton communities: surprising results!
This study demonstrates the importance of biology and ecology to understanding iron biogeochemistry.


Air-sea gas disequilibrium drove deoxygenation of the deep ice-age ocean
This study provides one of the first mechanistic explanations for Last Glacial Maximum deep ocean deoxygenation.


Spatial and temporal variability of bioactive trace metals, speciation and organic metal-binding ligands in the eastern Gulf of Mexico
Mellett and Buck present the concentrations of bioactive trace metals (Fe, Cu, Mn, Zn, Co, Ni, Cd, and Pb), Fe-and Cu-binding organic ligands, and electroactive Fe-binding humic substances in the eastern Gulf of Mexico.


Thorium-Protactinium fate across the tropical Atlantic Ocean: what reveals the water column-sediment coupling
Twenty seawater profiles and twenty core-top 231-protactinium and 230-thorium analyses were realised by Ng and colleagues along five depth transects across the northern tropical Atlantic open ocean.


Compilation of dissolved organic matter (DOM) data obtained from global ocean observations from 1994 to 2020
This compilation consists of measurements of dissolved organic matter (DOM) and other chemical and hydrographic parameters obtained during the global ocean observations from 1994-01-01 to 2019-12-31.

Repository of recorded webinars featuring GEOTRACES research
Watch recorded on-line talks featuring GEOTRACES research and share your recordings with us!

2021 Call for SCOR Working Group Proposals
Deadline extended to May 16, 2021!

2022 Ocean Sciences Meeting - Call for session proposals - Please contact the IPO in advance
Please inform the IPO before May 12, 2021.

A tool for reading GEOTRACES data in Julia
Have you developed a helpful tool for IDP users? Do you wish to discover a tool developed by IDP users? This post is for you.

GEOTRACES Informations



14 April - 24 April 2021, SOTS Process Study (GIpr08), Southern Ocean.

7 July - 17 August 2021, MetalGate Process Study (GApr16), North Atlantic Ocean and seas around Iceland. 

Upcoming GEOTRACES or GEOTRACES-related events:

1 June 2021, Creating the Ocean We Want – UN Ocean Decade High-Level Launch, virutal meeting.

16 June 2021, 2021 European Conference of Aix-Marseille University: Protect our oceans, the challenge of Europe's global leadership, Brussels, Belgium.

22-27 June 2021ASLO 2021, virtual meeting. Check the list of GEOTRACES and related sessions.

4-9 July 2021Goldschmidt 2021, virtual meeting. Check the list of GEOTRACES and related sessions.

26-30 July 2021, Iron at the Air-Sea Interface Workshop, Asheville, NC, USA. Register before June 25, 2021. Workshop co-sponsored by GEOTRACES and SOLAS!

DEFERRED to 2023! Gordon Research Conference (GRC) and Seminar (GRS) on Chemical Oceanography, Southern New Hampshire University, Manchester, NH, US.

Access the GEOTRACES Calendar


Job Opportunities

Check the GEOTRACES website to view the latest job opportunities posted:

3 PhD positions in marine biogeochemistry, ICBM, Oldenburg, Germany

PhD position in Mediterranean Mercury Modeling, LSCE and MIO, France

Postdoctoral Scholar - Iron-binding organic ligands in open ocean systems, University of South Florida, St Petersburg, USA

Postdoctoral position in global biogeochemical cycles, Univ. of New South Wales, Sydney, Australia

Postdoctoral position on modelling the resource limitation of ocean microbes, University of Liverpool, UK


Latest Publications

- Banerji, U. S., Bhushan, R., Joshi, K. B., Shaji, J., & Jull, A. J. T. (2021). Hydroclimate variability during the last two millennia from the mudflats of Diu Island, Western India. Geological Journal, gj.4116. DOI: https://doi.org/10.1002/gj.4116

- Hayes, C. T., Costa, K. M., Anderson, R. F., Calvo, E., Chase, Z., Demina, L. L., Dutay, J‐C., German, C. R., Heimbürger‐Boavida, L-E., Jaccard, S. L., Jacobel, A., Kohfeld, K. E., Kravchishina, M. D., Lippold, J., Mekik, F., Missiaen, L., Pavia, F. J., Paytan, Adina Pedrosa‐Pamies, Rut, Petrova, M. V., Rahman, S., Robinson, L. F., Roy‐Barman, M., Sanchez‐Vidal, A., Shiller, A., Tagliabue, A., Tessin, A. C., van Hulten, M.,  Zhang, J. (2021). Global Ocean Sediment Composition and Burial Flux in the Deep Sea. Global Biogeochemical Cycles, e2020GB006769. DOI: https://doi.org/10.1029/2020GB006769

- Holmes, T. M., Wuttig, K., Chase, Z., Schallenberg, C., Merwe, P., Townsend, A. T., & Bowie, A. R. (2020). Glacial and Hydrothermal Sources of Dissolved Iron (II) in Southern Ocean Waters Surrounding Heard and McDonald Islands. Journal of Geophysical Research: Oceans, 125(10), e2020JC016286. DOI: https://doi.org/10.1029/2020JC016286

- Homoky, W. B., Conway, T. M., John, S. G., König, D., Deng, F., Tagliabue, A., & Mills, R. A. (2021). Iron colloids dominate sedimentary supply to the ocean interior. Proceedings of the National Academy of Sciences of the United States of America, 118(13). DOI: https://doi.org/10.1073/pnas.2016078118

- Oka, A., Tazoe, H., & Obata, H. (2021). Simulation of global distribution of rare earth elements in the ocean using an ocean general circulation model. Journal of Oceanography, 1–18. DOI: https://doi.org/10.1007/s10872-021-00600-x

- Paffrath, R., Laukert, G., Bauch, D., Rutgers van der Loeff, M., & Pahnke, K. (2021). Separating individual contributions of major Siberian rivers in the Transpolar Drift of the Arctic Ocean. Scientific Reports, 11(1), 8216. DOI: https://doi.org/10.1038/s41598-021-86948-y

- Rahlf, P., Laukert, G., Hathorne, E. C., Vieira, L. H., & Frank, M. (2021). Dissolved neodymium and hafnium isotopes and rare earth elements in the Congo River Plume: Tracing and quantifying continental inputs into the southeast Atlantic. Geochimica et Cosmochimica Acta, 294, 192–214. DOI: https://doi.org/10.1016/J.GCA.2020.11.017

- Robinson, S., Ivanovic, R., van de Flierdt, T., Blanchet, C. L., Tachikawa, K., Martin, E. E., Cook, C. P., Williams, T., Gregoire, L., Plancherel, Y., Jeandel, C., Arsouze, T. (2021). Global continental and marine detrital εNd: An updated compilation for use in understanding marine Nd cycling. Chemical Geology, 567, 120119. DOI: https://doi.org/10.1016/J.CHEMGEO.2021.120119

Access the GEOTRACES Publication Database

GEOTRACES in Numbers

Cruises completed: 124
Section cruises completed: 42
Publications: 1581

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