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Characterisation Method Information
Characterisation Method Name:
N2O impact on YOLL
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: global warming pathway and secondary NOx pathway
Method Description:
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.
Literature Reference:
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
Methodological Range:
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).
Notes:

Existing Characterisation Factors of N2O impact on YOLL
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor YOLL EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
N2O 2.44E-04 p yr/kg 2 pathways