Preprints
https://doi.org/10.5194/egusphere-2024-258
https://doi.org/10.5194/egusphere-2024-258
08 Feb 2024
 | 08 Feb 2024
Status: this preprint is open for discussion.

Riverine nutrient impact on global ocean nitrogen cycle feedbacks and marine primary production in an Earth System Model

Miriam Tivig, David Peter Keller, and Andreas Oschlies

Abstract. Riverine nutrient export is an important process in marine coastal biogeochemistry and also impacts global marine biology. The nitrogen cycle is a key player here. Internal feedbacks regulate not only nitrogen distribution, but also primary production and thereby oxygen concentrations. Phosphorus is another essential nutrient and interacts with the nitrogen cycle via different feedback mechanisms. After a previous study of the marine nitrogen cycle response to riverine nitrogen supply, we here additionally include phosphorus from river export with different phosphorus burial scenarios and study the impact of phosphorus alone and in combination with nitrogen in a global 3-D ocean biogeochemistry model. Again, we analyse the effects on near coastal and open ocean biogeochemistry. We find that the addition of bio-available riverine phosphorus alone or together with nitrogen affects marine biology on millennial timescales more than riverine nitrogen alone. Biogeochemical feedbacks in the marine nitrogen cycle are strongly influenced by the additional phosphorus. Where bio-available phosphorus is increased by river input, nitrogen concentrations increase as well, except for regions with high denitrification rates. High phosphorus burial rates decrease biological production significantly. Globally, riverine phosphorus leads to elevated primary production rates in the coastal and open oceans.

Miriam Tivig, David Peter Keller, and Andreas Oschlies

Status: open (until 21 Mar 2024)

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Miriam Tivig, David Peter Keller, and Andreas Oschlies

Model code and software

UVic simulation with riverine nutrient export from NEWS2 dataset Miriam Tivig, David P. Keller, and Andreas Oschlies https://hdl.handle.net/20.500.12085/85adfcd5-bc86-440c-a205-496749a9025f

Miriam Tivig, David Peter Keller, and Andreas Oschlies

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Short summary
Marine biological production is highly dependent on the availability of nitrogen and phosphorus. Rivers are the main source of phosphorus to the oceans but poorly represented in global model oceans. We include dissolved nitrogen and phosphorus from river export in a global model ocean and find that the addition of riverine phosphorus affects marine biology on millennial timescales more than riverine nitrogen alone. Globally, riverine phosphorus input increase primary production rates.