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AGU: Journal of Geophysical Research, Oceans

 

Keywords

  • particulate and dissolved organic matter
  • biogenic silica
  • calcium carbonate
  • respiration
  • coastal upwelling
  • NW Spain

Index Terms

  • Oceanography: Biological and Chemical: Nutrients and nutrient cycling
  • Oceanography: Biological and Chemical: Biogeochemical cycles, processes, and modeling
  • Oceanography: Biological and Chemical: Marine organic chemistry
Abstract
Cited By (6)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, C07017, 14 PP., 2006
doi:10.1029/2004JC002473

Stoichiometry of the degradation of dissolved and particulate biogenic organic matter in the NW Iberian upwelling

X. A. Álvarez-Salgado

Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas, Vigo, Spain

M. Nieto-Cid

Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas, Vigo, Spain

J. Gago

Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas, Vigo, Spain

S. Brea

Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas, Vigo, Spain

C. G. Castro

Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas, Vigo, Spain

M. D. Doval

Xunta de Galicia, Instituto Tecnolóxico de Medio Mariño (INTECMAR), Vilagarcía de Arousa, Spain

F. F. Pérez

Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas, Vigo, Spain

The average composition of the dissolved and particulate products of early degradation of marine phytoplankton has been established for the first time in a coastal upwelling system using a mixing analysis along isopycnal surfaces combined with a stoichiometric model. About 17–18% of the mineralized organic matter is derived from the decomposition of organic particulates, and 16–35% is from the dissolved organic matter. The remaining 50–70% is derived probably from large fast sinking particles. On average, the mineralized material on large particles has the closest composition to the Redfield formula. The ratio of dissolved saccharides to dissolved organic matter respiration is >40% higher than expected from a material of Redfield composition. Finally, the ratio of lipid to particulate organic matter respiration is >80% larger than expected from a material of Redfield composition. Regarding the decomposition of hard structures, biogenic silica dissolves predominantly in the inner shelf, where organic carbon oxidation is more intense, and diatom deposition occurs preferentially.

Received 7 May 2004; accepted 13 March 2006; published 20 July 2006.

Citation: Álvarez-Salgado, X. A., M. Nieto-Cid, J. Gago, S. Brea, C. G. Castro, M. D. Doval, and F. F. Pérez (2006), Stoichiometry of the degradation of dissolved and particulate biogenic organic matter in the NW Iberian upwelling, J. Geophys. Res., 111, C07017, doi:10.1029/2004JC002473.

Cited By

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