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  Large Contribution of Pteropods to Shallow CaCO3 Export

Buitenhuis, E. T., Le Quere, C., Bednarsek, N., & Schiebel, R. (2019). Large Contribution of Pteropods to Shallow CaCO3 Export. Global Biogeochemical Cycles, 33(3), 458-468. doi:10.1029/2018GB006110.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0003-EA81-3 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0003-EA82-2
Genre: Zeitschriftenartikel

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 Urheber:
Buitenhuis, Erik T.1, Autor
Le Quere, Corinne1, Autor
Bednarsek, Nina1, Autor
Schiebel, Ralf2, Autor           
Affiliations:
1external, ou_persistent22              
2Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              

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 Zusammenfassung: The literature on the relative contributions of pelagic calcifying taxa to the global ocean export of CaCO3 is divided. Studies based on deep sediment trap data tend to argue that either foraminifers or coccolithophores, both calcite producers, dominate export. However, the compilations of biomass observations for pteropods, coccolithophores, and foraminifers instead show that pteropods dominate the global ocean calcifier biomass and therefore likely also carbonate export. Here we present a new global ocean biogeochemical model that explicitly represents these three groups of pelagic calcifiers. We synthesize databases of the physiology of the three groups to parameterize the model and then tune the unconstrained parameters to reproduce the observations of calcifier biomass and CaCO3 export. The model can reproduce both these observational databases; however, substantial dissolution of aragonite above the aragonite saturation horizon is required to do so. We estimate a contribution of pteropods to shallow (100 m) export of CaCO3 of at least 33% and to pelagic calcification of up to 89%. The high production‐high dissolution configuration that shows closest agreement with all the observations has a CaCO3 production of 4.7 Pg C/year but CaCO3 export at 100 m of only 0.6 Pg C/year.

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Sprache(n): eng - English
 Datum: 2019
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000464651600012
DOI: 10.1029/2018GB006110
 Art des Abschluß: -

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Titel: Global Biogeochemical Cycles
  Alternativer Titel : Glob. Biogeochem. Cycle
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Washington, DC : American Geophysical Union
Seiten: - Band / Heft: 33 (3) Artikelnummer: - Start- / Endseite: 458 - 468 Identifikator: ISSN: 0886-6236
n.a.: /journals/resource/954925553383