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Effects of phytoplankton physiology on global ocean biogeochemistry and climate.


ABSTRACT: The similarity of the average ratios of nitrogen (N) and phosphorus (P) in marine dissolved inorganic and particulate organic matter, dN:P and pN:P, respectively, indicates tight links between those pools in the world ocean. Here, we analyze this linkage by varying phytoplankton N and P subsistence quotas in an optimality-based ecosystem model coupled to an Earth system model. The analysis of our ensemble of simulations discloses various feedbacks between changes in the N and P quotas, N2 fixation, and denitrification that weaken the often-hypothesized tight coupling between dN:P and pN:P. We demonstrate the importance of particulate N:C and P:C ratios for regulating dN:P on the global scale, with marine oxygen level being an important control. Our analysis provides further insight into the potential interdependence of phytoplankton physiology and global climate conditions.

SUBMITTER: Chien CT 

PROVIDER: S-EPMC10371029 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature

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Effects of phytoplankton physiology on global ocean biogeochemistry and climate.

Chien Chia-Te CT   Pahlow Markus M   Schartau Markus M   Li Na N   Oschlies Andreas A  

Science advances 20230726 30


The similarity of the average ratios of nitrogen (N) and phosphorus (P) in marine dissolved inorganic and particulate organic matter, dN:P and pN:P, respectively, indicates tight links between those pools in the world ocean. Here, we analyze this linkage by varying phytoplankton N and P subsistence quotas in an optimality-based ecosystem model coupled to an Earth system model. The analysis of our ensemble of simulations discloses various feedbacks between changes in the N and P quotas, N<sub>2</  ...[more]

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