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AGU: Journal of Geophysical Research, Oceans

 

Keywords

  • nitrogen cycling
  • primary production
  • mesoscale features
  • North Atlantic Ocean

Index Terms

  • Biogeosciences: Biogeochemical cycles, processes, and modeling
  • Biogeosciences: Carbon cycling
  • Oceanography: General: Descriptive and regional oceanography
  • Oceanography: Physical: Eddies and mesoscale processes
Abstract
Cited By (29)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, C07S13, 15 PP., 2005
doi:10.1029/2004JC002616

An estimation of annual new production and carbon fluxes in the northeast Atlantic Ocean during 2001

Camila Fernández I.

Laboratoire d'Océanographie et de Biogéochimie, UMR 6535, Centre National de Recherche Scientifique, Centre d'Océanologie de Marseille, Université de la Méditerranée, Marseille, France

Patrick Raimbault

Laboratoire d'Océanographie et de Biogéochimie, UMR 6535, Centre National de Recherche Scientifique, Centre d'Océanologie de Marseille, Université de la Méditerranée, Marseille, France

Nicole Garcia

Laboratoire d'Océanographie et de Biogéochimie, UMR 6535, Centre National de Recherche Scientifique, Centre d'Océanologie de Marseille, Université de la Méditerranée, Marseille, France

Peggy Rimmelin

Laboratoire d'Océanographie et de Biogéochimie, UMR 6535, Centre National de Recherche Scientifique, Centre d'Océanologie de Marseille, Université de la Méditerranée, Marseille, France

Guy Caniaux

National de Recherche Météorologique, Toulouse, France

A dual 13C/15N isotopic technique was used to estimate carbon and nitrogen uptake rates during the 1-year-long Programme Océan Multidisciplinaire Méso Echelle (POMME) experiment in the northeast basin of the Atlantic Ocean (16°–22°W, 38°–45°N). Rates of primary production ranged from 2.26 μmoles L−1 d−1 in winter to maximum surface values of 7.8 μmoles L−1 d−1 during the spring season. Nitrate assimilation was intense since the beginning of winter and accounted for 3–7 mmoles m−2 d−1 in the first 80 m depth of the water column. Rates increased to 5–9 mmoles m−2 d−1 during the spring season. NO3 − uptake rates during the late summer season were close to winter values. Ammonium assimilation activity balanced the uptake of nitrate for all seasons. The seasonal f ratio was close to 0.28 in winter, increased to 0.34 in spring, and, finally, decreased to 0.25 in late summer. Annual carbon uptake rates for the entire POMME area accounted for 16.9 moles C m−2 yr−1. From this result, annual new production could be estimated to 5.7 moles C m−2 yr−1.

Received 22 July 2004; accepted 19 May 2005; published 7 July 2005.

Citation: Fernández I., C., P. Raimbault, N. Garcia, P. Rimmelin, and G. Caniaux (2005), An estimation of annual new production and carbon fluxes in the northeast Atlantic Ocean during 2001, J. Geophys. Res., 110, C07S13, doi:10.1029/2004JC002616.

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