Articles | Volume 15, issue 8
https://doi.org/10.5194/bg-15-2289-2018
https://doi.org/10.5194/bg-15-2289-2018
Research article
 | 
19 Apr 2018
Research article |  | 19 Apr 2018

Particulate barium tracing of significant mesopelagic carbon remineralisation in the North Atlantic

Nolwenn Lemaitre, Hélène Planquette, Frédéric Planchon, Géraldine Sarthou, Stéphanie Jacquet, Maribel I. García-Ibáñez, Arthur Gourain, Marie Cheize, Laurence Monin, Luc André, Priya Laha, Herman Terryn, and Frank Dehairs

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Cited articles

Alvarez, M., Pérez, F., Bryden, H., and Rios, A. F.: Physical and biogeochemical transports structure in the North Atlantic subpolar gyre, J. Geophys. Res., 109, 1–21, https://doi.org/10.1029/2003JC002015, 2004.
Aristegui, J., Gasol, J. M., Duarte, C. M., and Herndl, G. J.: Microbial oceanography of the dark ocean' s pelagic realm, Limnol. Oceanogr., 54, 1501–1529, 2009.
Arístegui, J., Agustí, S., Middelburg, J. J., and Duarte, C. M.: Respiration in the mesopelagic and bathypelagic zones of the oceans, in: Respiration in Aquatic Ecosystems, edited by: Del Giorgio, P. A. and Williams, P. J., 182–206, 2005.
Bach, L. T., Boxhammer, T., Larsen, A., Hildebrandt, N., Schulz, K. G., and Riebesell, U.: Influence of plankton community structure on the sinking velocity of marine aggregates, Global Biogeochem. Cy., 30, 1145–1165, https://doi.org/10.1002/2016GB005372, 2016.
Baltar, F., Aristegui, J., Gasol, J. M., Sintes, E., and Herndl, G. J.: Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic, Limnol. Oceanogr., 54, 182–193, 2009.
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Short summary
We present the particulate biogenic barium distributions in the North Atlantic for the first time with the objective of estimating mesopelagic carbon remineralisation fluxes. The remineralisation fluxes balanced or slightly exceeded the upper-ocean carbon export fluxes. This is a key result as the North Atlantic is generally assumed to be efficient in transferring carbon to the deep ocean, but during our study, the North Atlantic was characterized by a near-zero carbon sequestration efficiency.
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