Articles | Volume 18, issue 14
Biogeosciences, 18, 4305–4320, 2021
https://doi.org/10.5194/bg-18-4305-2021

Special issue: Ecological and biogeochemical functioning of the coastal upwelling...

Biogeosciences, 18, 4305–4320, 2021
https://doi.org/10.5194/bg-18-4305-2021

Research article 23 Jul 2021

Research article | 23 Jul 2021

Nitrogen loss processes in response to upwelling in a Peruvian coastal setting dominated by denitrification – a mesocosm approach

Kai G. Schulz et al.

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Short summary
Upwelling of nutrient-rich deep waters to the surface make eastern boundary upwelling systems hot spots of marine productivity. This leads to subsurface oxygen depletion and the transformation of bioavailable nitrogen into inert N2. Here we quantify nitrogen loss processes following a simulated deep water upwelling. Denitrification was the dominant process, and budget calculations suggest that a significant portion of nitrogen that could be exported to depth is already lost in the surface ocean.
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