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

AuthorsÁlvarez-Salgado, Xosé Antón ; Nieto-Cid, Mar ; Gago, Jesús ; Brea, S. ; Castro, Carmen G. ; Doval, M. Dolores ; Pérez, Fiz F.
Issue Date2006
PublisherAmerican Geophysical Union
CitationJournal of Geophysical Research - Part C - Oceans 111: C07017 (2006)
AbstractThe 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.
Description14 páginas, 2 tablas, 7 figuras
Publisher version (URL)http://dx.doi.org/10.1029/2004JC002473
Appears in Collections:(IIM) Artículos
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