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Baumann et al. (2023): Counteracting effects of nutrient composition (Si:N) on export flux under artificial upwelling

Moritz Baumann, Silvan U. Goldenberg, Jan Taucher, Mar Fernández-Méndez, Joaquin Ortiz, Jacqueline Haussmann and Ulf Riebesell IN: Front. Mar. Sci., Sec. Marine Biogeochemistry 10; doi: 10.3389/fmars.2023.1181351

Ocean artificial upwelling of nutrient-rich water stimulates primary productivity and could enhance the biological carbon pump for natural CO2 removal. Its potential may depend on the Si availability in the upwelled water, which regulates the abundance of diatoms that are key carbon exporters. In a mesocosm experiment, we tested the effect of nutrient composition (Si relative to N) in artificially upwelled waters on export quantity and quality in a subtropical oligotrophic environment.