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Including N$_{2}$O in ozone depletion models for LCA

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Including N$_{2}$O in ozone depletion models for LCA

Content Provider	Springer Nature Link
Author	Lane, Joe Lant, Paul
Copyright Year	2011
Abstract	Recent literature has highlighted a renewed debate amongst the scientific community about the relevance of nitrous oxide (N$_{2}$O) emissions to future ozone layer management. This raises the question as to whether the life cycle assessment (LCA) community should also consider incorporating N$_{2}$O into its ozone depletion models. This discussion summarises a preliminary investigation into the justification for doing so.Literature on the atmospheric science of ozone depletion and N$_{2}$O was reviewed, in particular recent proposals for an ozone depletion potential (ODP) factor that can be applied to anthropogenic N$_{2}$O emissions. To identify their potential significance to life cycle impact assessment (LCIA) results, these ODP values were applied to both a wastewater management case study and global emissions inventories. The literature review was also used to highlight certain issues that need further consideration if N$_{2}$O is to be incorporated into LCIA models.Atmospheric modelling has shown that continued anthropogenic N$_{2}$O emissions could substantially affect ozone layer recovery. Furthermore, N$_{2}$O now represents one of the biggest remaining opportunities for emissions abatement. The two steady state ODP factors for N$_{2}$O available in the literature are in close agreement, with one of the models used showing reasonable calibration to accepted ODP values for other substances. Analysis of the wastewater case study showed that the incorporation of these interim ODP values for N$_{2}$O could have a substantial impact on LCIA results interpretation. This finding should be equally relevant for other case studies where N$_{2}$O emissions play a prominent role.The inclusion of N$_{2}$O into marginal-impact LCIA ozone depletion models would seem justified, given the relevance of N$_{2}$O emissions to a number of planning debates in which LCA currently has a prominent role. If this is not pursued, then the use of LCIA to support decision-making could mask, rather than reveal, an issue that may be environmentally relevant. Published ODP values for N$_{2}$O could be used as an interim measure. However, they are dependent on assumptions that may not be the most relevant choice for application to LCA studies. Further investigation is therefore required on how best to specify a range of ODP values for N$_{2}$O that can support robust sensitivity analysis in LCIA. Fortunately, the state of atmospheric modelling science would seem sufficiently mature to be able to inform this process. LCA-specific methodological challenges (e.g. choice of time frames, spatial implications) will also need to be addressed.
Starting Page	252
Ending Page	257
Page Count	6
File Format	PDF
ISSN	09483349
Journal	The International Journal of Life Cycle Assessment
Volume Number	17
Issue Number	2
e-ISSN	16147502
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-12-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	LCA N$_{2}$O Nitrous oxide Normalisation ODP Ozone layer Wastewater treatment Environment Environmental Economics
Content Type	Text
Resource Type	Article
Subject	Environmental Science

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