The role of calcium in regulating marine phosphorus burial and atmospheric oxygenation.

ABSTRACT: The marine phosphorus cycle plays a critical role in controlling the extent of global primary productivity and thus atmospheric pO₂ on geologic time scales. However, previous attempts to model carbon-phosphorus-oxygen feedbacks have neglected key parameters that could shape the global P cycle. Here we present new diagenetic models to fully parameterize marine P burial. We have also coupled this diagenetic framework to a global carbon cycle model. We find that seawater calcium concentration, by strongly influencing carbonate fluorapatite (CFA) formation, is a key factor controlling global phosphorus cycling, and therefore plays a critical role in shaping the global oxygen cycle. A compilation of Cenozoic deep-sea sedimentary phosphorus speciation data provides empirical support f

SUBMITTER: Zhao M 

PROVIDER: S-EPMC7203231 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature