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

Nuno Miguel Dias Cosme, Marja Koski, Michael Zwicky Hauschild

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Abstract

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 is considered low. The presented XF estimation method contributes with a central component for site-dependent characterization factors (CFs) for marine eutrophication, to be coupled with environmental fate of N emissions and effects of oxygen depletion on biota.
Original languageEnglish
Publication date2015
Number of pages1
Publication statusPublished - 2015
EventICES Annual Science Conference 2015 - Copenhagen, Denmark
Duration: 21 Sep 201525 Sep 2015

Conference

ConferenceICES Annual Science Conference 2015
CountryDenmark
CityCopenhagen
Period21/09/201525/09/2015

Bibliographical note

ICES CM 2015/R:24

Cite this

Cosme, N. M. D., Koski, M., & Hauschild, M. Z. (2015). From nitrogen enrichment to oxygen depletion: a mechanistic model of coastal marine ecosystems response. Abstract from ICES Annual Science Conference 2015, Copenhagen, Denmark.