Ocean acidification affects iron speciation during a coastal seawater mesocosm experiment

Title
Ocean acidification affects iron speciation during a coastal seawater mesocosm experiment
Publication Type
Journal Article
Year of Publication
2010
Authors

Breitbarth E, Bellerby RGJ, Neill CC, Ardelan MV, Meyerhofer M, Zollner E, Croot PL, Riebesell U

Journal
Biogeosciences
Volume
7
Pagination
1065-1073
ISBN Number
Keywords

CO2 enrichment, mesocosm, Iron speciation, Bloom, Primary production, Raunefjord, Bergen, Norway, PEECE, 30 m3

Abstract

Rising atmospheric CO2 is acidifying the surface ocean, a process which is expected to greatly influence the chemistry and biology of the future ocean. Following the development of iron-replete phytoplankton blooms in a coastal mesocosm experiment at 350, 700, and 1050 ?atm pCO2,we observed significant increases in dissolved iron concentrations,Fe(II) concentrations, and Fe(II) half-life times duringand after the peak of blooms in response to CO2 enrichmentand concomitant lowering of pH, suggesting increasediron bioavailability. If applicable to the open ocean this mayprovide a negative feedback mechanism to the rising atmosphericCO2 by stimulating marine primary production.

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