Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model
Emissions of nitrogen (N) from anthropogenic sources enrich marine waters and promote planktonic growth. This newly synthesised organic carbon is eventually exported to benthic waters where aerobic respiration by heterotrophic bacteria results in the consumption of dissolved oxygen (DO). This pathwa...
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ftrepec:oai:RePEc:eee:ecomod:v:317:y:2015:i:c:p:50-63 2024-04-14T08:08:10+00:00 Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model Cosme, Nuno Koski, Marja Hauschild, Michael Z. http://www.sciencedirect.com/science/article/pii/S0304380015004123 unknown http://www.sciencedirect.com/science/article/pii/S0304380015004123 article ftrepec 2024-03-19T10:31:55Z Emissions of nitrogen (N) from anthropogenic sources enrich marine waters and promote planktonic growth. This newly synthesised organic carbon is eventually exported to benthic waters where aerobic respiration by heterotrophic bacteria results in the consumption of dissolved oxygen (DO). This pathway is typical of marine eutrophication. A model is proposed to mechanistically estimate the response of coastal marine ecosystems to N inputs. It addresses the biological processes of nutrient-limited primary production (PP), metazoan consumption, and bacterial degradation, in four distinct sinking routes from primary (cell aggregates) and secondary producers (faecal pellets, carcasses, and active vertical transport). Carbon export production (PE) and ecosystems eXposure Factors (XF), which represents a nitrogen-to-oxygen ‘conversion’ potential, were estimated at a spatial resolution of 66 large marine ecosystem (LME), five climate zones, and site-generic. The XFs obtained range from 0.45 (Central Arctic Ocean) to 15.9kgO2kgN−1 (Baltic Sea). While LME resolution is recommended, aggregated PE or XF per climate zone can be adopted, but not global aggregation due to high variability. The XF is essential to estimate a marine eutrophication impacts indicator in Life Cycle Impact Assessment (LCIA) of anthropogenic-N emissions. Every relevant process was modelled and the uncertainty of the driving parameters considered low suggesting valid applicability in characterisation modelling in LCIA. Nitrogen; Carbon export; Oxygen depletion; Marine eutrophication; Exposure factor; Life cycle impact assessment; Article in Journal/Newspaper Arctic Arctic Ocean RePEc (Research Papers in Economics) Arctic Arctic Ocean |
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Open Polar |
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RePEc (Research Papers in Economics) |
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description |
Emissions of nitrogen (N) from anthropogenic sources enrich marine waters and promote planktonic growth. This newly synthesised organic carbon is eventually exported to benthic waters where aerobic respiration by heterotrophic bacteria results in the consumption of dissolved oxygen (DO). This pathway is typical of marine eutrophication. A model is proposed to mechanistically estimate the response of coastal marine ecosystems to N inputs. It addresses the biological processes of nutrient-limited primary production (PP), metazoan consumption, and bacterial degradation, in four distinct sinking routes from primary (cell aggregates) and secondary producers (faecal pellets, carcasses, and active vertical transport). Carbon export production (PE) and ecosystems eXposure Factors (XF), which represents a nitrogen-to-oxygen ‘conversion’ potential, were estimated at a spatial resolution of 66 large marine ecosystem (LME), five climate zones, and site-generic. The XFs obtained range from 0.45 (Central Arctic Ocean) to 15.9kgO2kgN−1 (Baltic Sea). While LME resolution is recommended, aggregated PE or XF per climate zone can be adopted, but not global aggregation due to high variability. The XF is essential to estimate a marine eutrophication impacts indicator in Life Cycle Impact Assessment (LCIA) of anthropogenic-N emissions. Every relevant process was modelled and the uncertainty of the driving parameters considered low suggesting valid applicability in characterisation modelling in LCIA. Nitrogen; Carbon export; Oxygen depletion; Marine eutrophication; Exposure factor; Life cycle impact assessment; |
format |
Article in Journal/Newspaper |
author |
Cosme, Nuno Koski, Marja Hauschild, Michael Z. |
spellingShingle |
Cosme, Nuno Koski, Marja Hauschild, Michael Z. Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
author_facet |
Cosme, Nuno Koski, Marja Hauschild, Michael Z. |
author_sort |
Cosme, Nuno |
title |
Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
title_short |
Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
title_full |
Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
title_fullStr |
Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
title_full_unstemmed |
Exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
title_sort |
exposure factors for marine eutrophication impacts assessment based on a mechanistic biological model |
url |
http://www.sciencedirect.com/science/article/pii/S0304380015004123 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
http://www.sciencedirect.com/science/article/pii/S0304380015004123 |
_version_ |
1796305594788872192 |