A review of Si particle fluxes in the modern ocean ...

• Main Authors: Ragueneau, Olivier, Tréguer, Paul, Leynaert, Aude, Anderson, Robert F, Brzezinski, Mark A, DeMaster, David J, Dugdale, Richard, Dymond, Jack R, Fischer, Gerhard, Francois, Roger, Heinze, Christoph, Maier-Reimer, Ernst, Martin-Jézéquel, Véronique, Nelson, David M, Quéguiner, Bernard
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2000
• Subjects: Barcelona Coast; Pertuis Charentais; Taranto Mare Piccolo; Origin and Fate of Biogenic Particle Fluxes in the Ocean ORFOIS; Silicon Cycling in the World Ocean SINOPS; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.787476; https://doi.pangaea.de/10.1594/PANGAEA.787476

Due to the major role played by diatoms in the biological pump of CO2, and to the presence of silica-rich sediments in areas that play a major role in air-sea CO2 exchange (e.g. the Southern Ocean and the Equatorial Pacific), opal has a strong potential as a proxy for paleoproductivity reconstructions. However, because of spatial variations in the biogenic silica preservation, and in the degree of coupling between the marine Si and C biogeochemical cycles, paleoreconstructions are not straitghtforward. A better calibration of this proxy in the modern ocean is required, which needs a good understanding of the mechanisms that control the Si cycle, in close relation to the carbon cycle.This review of the Si cycle in the modern ocean starts with the mechanisms that control the uptake of silicic acid (Si(OH)4) by diatoms and the subsequent silicification processes, the regulatory mechanisms of which are uncoupled. This has strong implications for the direct measurement in the field of the kinetics of Si(OH)4 ... : Supplement to: Ragueneau, Olivier; Tréguer, Paul; Leynaert, Aude; Anderson, Robert F; Brzezinski, Mark A; DeMaster, David J; Dugdale, Richard; Dymond, Jack R; Fischer, Gerhard; Francois, Roger; Heinze, Christoph; Maier-Reimer, Ernst; Martin-Jézéquel, Véronique; Nelson, David M; Quéguiner, Bernard (2000): A review of the Si cycle in the modern ocean: recent progress and missing gaps in the application of biogenic opal as a paleoproductivity proxy. Global and Planetary Change, 26(4), 317-365 ...