From nitrogen enrichment to oxygen depletion: a mechanistic model of coastal marine ecosystems response ...

• Main Authors: Cosme, Nuno, Koski, Marja, Hauschild, Michael Zwicky
• Format: Conference Object
• Language: unknown
• Published: ASC 2015 - Theme session R 2024
• Subjects: Ecosystem observation, processes and dynamics; Pressures, impacts, conservation, and management; Arctic; Arctic Ocean; Zooplankton
• Online Access: https://dx.doi.org/10.17895/ices.pub.25682694; https://ices-library.figshare.com/articles/conference_contribution/From_nitrogen_enrichment_to_oxygen_depletion_a_mechanistic_model_of_coastal_marine_ecosystems_response/25682694

No abstracts are to be cited without prior reference to the author.Nitrogen (N) emissions from anthropogenic sources may enrich coastal waters and lead to marine eutrophication impacts. Processes describing N-limited primary production (PP), zooplankton grazing, and bacterial respiration of sinking organic carbon, were modelled to quantify the potential dissolved oxygen (DO) consumption as a function of N input. Such indicator is the basis for an eXposure Factor (XF) applied in Life Cycle Impact Assessment (LCIA) to estimate impacts from N enrichment. The Large Marine Ecosystems (LME) biogeographical classification system was adopted to address the spatial variation of the modelled parameters and to characterise spatially differentiated N-emissions. Preliminary XF results range from 0.5 kgO2·kgN-1 in the Central Arctic Ocean to 16 kgO2·kgN-1 in the Baltic Sea, out of a total of 66 LME-dependent XFs. All the relevant processes were included in a mechanistic model and the uncertainty of the driving parameters ...