BIOGEOCHEMICAL dataset collected during the TONGA cruise

The objective of the TONGA oceanographic expedition was to study the control of productivity and carbon sequestration by micronutrients of shallow hydrothermal origin in the Western Tropical South Pacific (WTSP) Ocean. The 37-day oceanographic survey took place on board the R/V L’Atalante in 2019 between Oct. 31 to Dec. 6 (Nouméa-Nouméa). Over a large area of the WTSP the team acquired numerous results on both the entire water column (up to the sediment) and the atmosphere.

Specific task are represented on figure 1: (task 1) to characterize chemically and optically shallow hydrothermal fluids and to compare the source from below (shallow hydrothermal fluids) with the source from above (atmospheric deposition); (task 2) to quantify the dynamical dispersion of the fluids at small and regional scale; (task 3) to investigate the impact of the shallow hydrothermal sources on the biological activity and diversity, and the feedback to the atmosphere via the oceanic emissions of primary and secondary aerosols. (Task 4) to communicate about the campaign (see for example our Tweeter account ( and the movie (26’) both in French ( and English (

A long west to east (up to the blue waters of the gyre) transect allowed to characterize the different biogeochemical provinces crossed and a focus in the region of the Lau Basin allowed to investigate the impact of shallow hydrothermal sources. A series of short and long stations allowed to fully characterize the stocks and the fluxes in the different provinces. Short-term (up to 10 days) processes studies have been conducted (drifting moorings and minicosms experiments). Part of these results will feed into important modeling work.

A fixed mooring line launched at the end of the campaign and recovered in Nov. 2020 as well as the 7 ARGO floats and 20 drifting buoys that were dropped during the campaign provide a broader temporal context of the acquisitions done during the campaign. An important focus of the campaign was the trace metal characterization of the entire water column. For this, TONGA has been labeled by the international program GEOTRACES ( The impact on biological communities of fluids is supported by the international IMBER program ( The TONGA project is also part of the LEFE program (funding by LEFE-CYBER and LEFE-GMMC), the ANR (Appel à projets génériques) and the Fondation A-MIDeX of the Aix-Marseille Université.

Scheme of the different tasks of the TONGA project and cruise


Biological oceanography


23N, 19S, 195E, 165W


Alternative access to data

FileSizeFormatProcessingAccessend of embargo
Bottle files
3 MoCSV, PDF, TXTQuality controlled data -
Active acoustic data
201 MoNetCDFQuality controlled data 2024-09-01
Dissolved Iron
584 KoCSVQuality controlled data -
Diazotrophs abundance
391 KoCSVQuality controlled data -
144 MoTEXTQuality controlled data -
Particulate Organic Nitrogen
424 KoCSVQuality controlled data -
Nitrogen fixation
430 KoCSVQuality controlled data -
613 KoCSVQuality controlled data -
419 KoCSVQuality controlled data -
POC and delta15N in sediment traps at 200m
579 KoCSVQuality controlled data -
Sediment Traps drifting mooring, all data
23 KoXLS, XLSXQuality controlled data -
Sediment Traps fixed mooring, all data
40 KoXLS, XLSXQuality controlled data -
Sediment Cores, all data
19 KoXLS, XLSXQuality controlled data -
How to cite
Guieu Cécile, Bonnet Sophie, Abadou Fatima, Alliouane Samir, Arnaud-Haond Sophie, Arnone Veronica, Baudoux Anne-Claire, Baumas Chloe, Beillard Lucie, Benavides Mar, Berman-Frank Ilana, Bhairy Nagib, Bigeard Estelle, Boulart Cedric, Bouruet-Aubertot Pascale, Boyd Philip, Bressac Matthieu, Camps Mercedes, Chaffron Samuel, Chavagnac Valérie, Chevaillier Servanne, Collot Julien, Cuypers Yannis, de Liège Guillaume, de Saint léger Emmanuel, de Vargas Colomban, Desboeufs Karine, Desgranges Marie-Maelle, Destrigneville Christine, Dimier Céline, Diruit Wendy, Dissard Delphine, Doussin Jean-François, Dufour Aurélie, Dulaquais Gabriel, Fernandez Jean-Michel, Feron Anaïs, Ferrieux Mathilde, Filella Alba, Forrer Heather, Fourrier Pierre, Gac Jean-Philippe, Gachenot Martin, Gaimoz Cécile, Garczarek Laurence, Gazeau Frédéric, Gonzalez Aridane, Gonzalez Santana David, Gorgues Thomas, Grima Nicolas, Grisoni Jean-Michel, Grosso Olivier, Guigue Catherine, Habasque Jeremie, Heimbürger-Boavida Lars-Eric, Jeandel Catherine, Jeanthon Christian, Journet Emilie, Knapp Angela, Lacan François, Le Gall Florence, Le Moal Pierre, Le Moigne Frédéric, Leblanc Karine, Leblond Nathalie, Lebourges-Dhaussy Anne, Leconte Jade, Lefèvre Dominique, Lombard Fabien, Lorrain Anne, Lory Caroline, Maes Christophe, Mahieu Léo, Marie Dominique, Mazoyer Camille, Menkes Christophe, Michoud Vincent, Montanes Maryline, Not Fabrice, Nunige Sandra, Paparella Francesco, Patriat Martin, Pelletier Bernard, Petrenko Anne, Planquette Helene, Point David, Portlock Gemma, Probert Ian, Pulido-Villena Elvira, Ratin Morgane, Ratnarajah Lavenia, Riso Ricardo, Rizzo Andrea, Salaun Pascal, Sarthou Geraldine, Schmechtig Catherine, Sellegri Karine, Simon Nathalie, Tagliabue Alessandro, Taillandier Vincent, Tamburini Christian, Tedetti Marc, Thibon Fanny, Tilliette Chloé, Torres Rodriguez Natalia, Triquet Sylvain, Uitz Julia, Van Wambeke France, Vaulot Daniel, Vigier Nathalie, Vilain Marion, Vorrath Maria Helena, Weppe Lucas, Whitby Hannah (2023). BIOGEOCHEMICAL dataset collected during the TONGA cruise. SEANOE.

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