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.
|Number of pages||1|
|Publication status||Published - 2015|
|Event||ICES Annual Science Conference 2015 - Copenhagen, Denmark|
Duration: 21 Sep 2015 → 25 Sep 2015
|Conference||ICES Annual Science Conference 2015|
|Period||21/09/2015 → 25/09/2015|
Bibliographical noteICES CM 2015/R:24
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.