Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
BG | Volume 15, issue 8
Biogeosciences, 15, 2565–2585, 2018
https://doi.org/10.5194/bg-15-2565-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Interactions between planktonic organisms and biogeochemical...

Biogeosciences, 15, 2565–2585, 2018
https://doi.org/10.5194/bg-15-2565-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 May 2018

Research article | 02 May 2018

N2 fixation as a dominant new N source in the western tropical South Pacific Ocean (OUTPACE cruise)

Mathieu Caffin et al.
Related authors  
Longitudinal contrast in turbulence along a  ∼ 19° S section in the Pacific and its consequences for biogeochemical fluxes
Pascale Bouruet-Aubertot, Yannis Cuypers, Andrea Doglioli, Mathieu Caffin, Christophe Yohia, Alain de Verneil, Anne Petrenko, Dominique Lefèvre, Hervé Le Goff, Gilles Rougier, Marc Picheral, and Thierry Moutin
Biogeosciences, 15, 7485–7504, https://doi.org/10.5194/bg-15-7485-2018,https://doi.org/10.5194/bg-15-7485-2018, 2018
Short summary
Carbonate system distribution, anthropogenic carbon and acidification in the western tropical South Pacific (OUTPACE 2015 transect)
Thibaut Wagener, Nicolas Metzl, Mathieu Caffin, Jonathan Fin, Sandra Helias Nunige, Dominique Lefevre, Claire Lo Monaco, Gilles Rougier, and Thierry Moutin
Biogeosciences, 15, 5221–5236, https://doi.org/10.5194/bg-15-5221-2018,https://doi.org/10.5194/bg-15-5221-2018, 2018
Short summary
In-depth characterization of diazotroph activity across the western tropical South Pacific hotspot of N2 fixation (OUTPACE cruise)
Sophie Bonnet, Mathieu Caffin, Hugo Berthelot, Olivier Grosso, Mar Benavides, Sandra Helias-Nunige, Cécile Guieu, Marcus Stenegren, and Rachel Ann Foster
Biogeosciences, 15, 4215–4232, https://doi.org/10.5194/bg-15-4215-2018,https://doi.org/10.5194/bg-15-4215-2018, 2018
Transfer of diazotroph-derived nitrogen to the planktonic food web across gradients of N2 fixation activity and diversity in the western tropical South Pacific Ocean
Mathieu Caffin, Hugo Berthelot, Véronique Cornet-Barthaux, Aude Barani, and Sophie Bonnet
Biogeosciences, 15, 3795–3810, https://doi.org/10.5194/bg-15-3795-2018,https://doi.org/10.5194/bg-15-3795-2018, 2018
Nutrient availability and the ultimate control of the biological carbon pump in the western tropical South Pacific Ocean
Thierry Moutin, Thibaut Wagener, Mathieu Caffin, Alain Fumenia, Audrey Gimenez, Melika Baklouti, Pascale Bouruet-Aubertot, Mireille Pujo-Pay, Karine Leblanc, Dominique Lefevre, Sandra Helias Nunige, Nathalie Leblond, Olivier Grosso, and Alain de Verneil
Biogeosciences, 15, 2961–2989, https://doi.org/10.5194/bg-15-2961-2018,https://doi.org/10.5194/bg-15-2961-2018, 2018
Short summary
Related subject area  
Biogeochemistry: Open Ocean
Sensitivity of ocean biogeochemistry to the iron supply from the Antarctic Ice Sheet explored with a biogeochemical model
Renaud Person, Olivier Aumont, Gurvan Madec, Martin Vancoppenolle, Laurent Bopp, and Nacho Merino
Biogeosciences, 16, 3583–3603, https://doi.org/10.5194/bg-16-3583-2019,https://doi.org/10.5194/bg-16-3583-2019, 2019
Short summary
Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence
Robyn E. Tuerena, Raja S. Ganeshram, Matthew P. Humphreys, Thomas J. Browning, Heather Bouman, and Alexander P. Piotrowski
Biogeosciences, 16, 3621–3635, https://doi.org/10.5194/bg-16-3621-2019,https://doi.org/10.5194/bg-16-3621-2019, 2019
Short summary
The effect of marine aggregate parameterisations on nutrients and oxygen minimum zones in a global biogeochemical model
Daniela Niemeyer, Iris Kriest, and Andreas Oschlies
Biogeosciences, 16, 3095–3111, https://doi.org/10.5194/bg-16-3095-2019,https://doi.org/10.5194/bg-16-3095-2019, 2019
Short summary
Sensitivity of atmospheric CO2 to regional variability in particulate organic matter remineralization depths
Jamie D. Wilson, Stephen Barker, Neil R. Edwards, Philip B. Holden, and Andy Ridgwell
Biogeosciences, 16, 2923–2936, https://doi.org/10.5194/bg-16-2923-2019,https://doi.org/10.5194/bg-16-2923-2019, 2019
Short summary
Nutrient distribution and nitrogen and oxygen isotopic composition of nitrate in water masses of the subtropical southern Indian Ocean
Natalie C. Harms, Niko Lahajnar, Birgit Gaye, Tim Rixen, Kirstin Dähnke, Markus Ankele, Ulrich Schwarz-Schampera, and Kay-Christian Emeis
Biogeosciences, 16, 2715–2732, https://doi.org/10.5194/bg-16-2715-2019,https://doi.org/10.5194/bg-16-2715-2019, 2019
Short summary
Cited articles  
Al-Mutairi, H. and Landry, M. R.: Active export of carbon and nitrogen at station ALOHA by diel migrant zooplankton, Deep-Sea Res. Pt. II, 48, 2083–2103, https://doi.org/10.1016/S0967-0645(00)00174-0, 2001. 
Altabet, M. A.: Variations in nitrogen isotopic composition between sinking and suspended particles: implications for nitrogen cycling and particle transformation in the open ocean, Deep-Sea Res. Pt. A, 35, 535–554, https://doi.org/10.1016/0198-0149(88)90130-6, 1988. 
Aminot, A. and Kérouel, R.: Dosage automatique des nutriments dans les eaux marines?: méthodes en flux continu, Ifremer, Plouzané, 2007. 
Atkinson, A., Shreeve, R. S., Pakhomov, E. A., Priddle, J., Blight, S. P., and Ward, P.: Zooplankton response to a phytoplankton bloom near South Georgia, Antarctica, Mar. Ecol.-Prog. Ser., 144, 195–210, https://doi.org/10.3354/meps144195, 1996. 
Bacon, M. P., Cochran, J. K., Hirschberg, D., Hammar, T. R., and Fleer, A. P.: Export flux of carbon at the equator during the EqPac time-series cruises estimated from 234Th measurements, Deep.-Sea Res. Pt. II, 43, 1133–1153, https://doi.org/10.1016/0967-0645(96)00016-1, 1996. 
Publications Copernicus
Download
Short summary
We performed N budgets to assess the role of N2 fixation on production and export in the western tropical South Pacific Ocean. We deployed a combination of techniques including high-sensitivity measurements of N input and sediment traps deployment. We demonstrated that N2 fixation was the major source of new N before atmospheric deposition and upward nitrate fluxes. It contributed significantly to organic matter export, indicating a high efficiency of this region to export carbon.
We performed N budgets to assess the role of N2 fixation on production and export in the western...
Citation