Calcium carbonate precipitation induced by the growth of the marine cyanobacterium Trichodesmium

Sven A. Kranz, Dieter Wolf-Gladrow, Gernot Nehrke, Gerald Langer, Björn Rost

    Research output: Contribution to journalArticleResearchpeer-review

    31 Citations (Scopus)

    Abstract

    In this laboratory study, we monitored the buildup of biomass and concomitant shift in seawater carbonate chemistry over the course of a Trichodesmium bloom under different phosphorus (P) availability. During exponential growth, dissolved inorganic carbon (DIC) decreased, while pH increased until maximum cell densities were reached. Once P became depleted, DIC decreased even further and total alkalinity (TA) dropped, accompanied by precipitation of aragonite. Under P-replete conditions, DIC increased and TA remained constant in the postbloom phase. A diffusion-reaction model was employed to estimate changes in carbonate chemistry of the diffusive boundary layer. This study demonstrates that Trichodesmium can induce precipitation of aragonite from seawater and further provides possible explanations about underlying mechanisms. © 2010, by the American Society of Limnology and Oceanography, Inc.
    Original languageEnglish
    Pages (from-to)2563-2569
    JournalLimnology and Oceanography
    Volume55
    Issue number6
    DOIs
    Publication statusPublished - 1 Nov 2010

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