Articles | Volume 18, issue 1
Biogeosciences, 18, 251–283, 2021
https://doi.org/10.5194/bg-18-251-2021
Biogeosciences, 18, 251–283, 2021
https://doi.org/10.5194/bg-18-251-2021
Research article
14 Jan 2021
Research article | 14 Jan 2021

Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes

Cara Nissen and Meike Vogt

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Short summary
Using a regional Southern Ocean ecosystem model, we find that the relative importance of Phaeocystis and diatoms at high latitudes is controlled by iron and temperature variability, with light levels controlling the seasonal succession in coastal areas. Yet, biomass losses via aggregation and grazing matter as well. We show that the seasonal succession of Phaeocystis and diatoms impacts the seasonality of carbon export fluxes with ramifications for nutrient cycling and food web dynamics.
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