|Characterisation Method Name:|
|N2O impact on YOLL|
|Principal Method Name:|
|EPS: global warming pathway and secondary NOx pathway|
|YOLL stands for Year of Lost Life.|
Model 1, global warming pathway
The characterisation factor is determined by an equivalency method using CO2 as a reference.
The global warming potential for N2O on a 100 years basis is 320 (IPCC 1994).
The characterisation factor of CO2 for YOLL is determined in CO2 impact on YOLL to 7.93E–07 YOLL/kg CO2. Therefore the characterisation factor of N2O for YOLL is 320*7.93E–07 = 2.54E–04 YOLL/kg N2O.
Model 2, secondary NOx pathway
The characterisation factor is determined by an equivalency method using NOx as a reference.
The transformation to nitrogen oxides and further to particles is difficult to model. However as a start and for this version of the EPS default method, 50% is assumed to be transferred to NOx and the resulting contribution to the category indicators are calculated using the NOx models. The other 50% of the N2O is assumed to be transformed to N2. At 50% conversion efficiency 1 kg of N2O will give 0.5*2*46/34 =1.35 kg NOx (NO2).
The characterisation factor of NOx for YOLL is determined in NOx impact on YOLL to 2.45E-05 YOLL/kg NOx. Therefore the characterisation factor of N2O for YOLL is 1.35*2.45E–05 = 3.31E–05 YOLL/kg N2O.
Calculation of characterisation factor
The total characterisation factor is thus 2.54E–04 + 3.31E–05 = 2.44E–04 YOLL/kg N2O.
|1. Houghton, J.T Jenkins, G.J. and Ephraums, J.J., (Ed.) (1990) Climate change – The IPCC scientific assessment. Cambridge University Press 2. IPCC, “The 1994 Report of the Scientific Assessment Working Group of IPCC. Summary for policymakers”, WMO and UNEP, 1994|
|The impact is of global character. The modelled system is therefore global. The temporal system borders are 100 years (1990-2090). The society effected is the one described in IPCC scenario IS92A. (IPCC, 1990).|
|Characterisation Parameter||Category Indicator||Impact Indication Principle||Aspect||Substance||Quantity||Unit||Notes|
|N2O||2.44E-04||p yr/kg||2 pathways|