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Characterisation Method Information
Characterisation Method Name:
Methane impact on YOLL
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: global warming pathway, oxidant formation 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.

Equivalency factor

The GWP100 was estimated by IPCC (Intergovernmental Panel on Climate Change)to 24.5 (1994).

Calculation of pathway specific characterisation factor

The characterisation factor of CO2 for YOLL was determined to 7.93E–07 YOLL/kg CO2 . The characterisation factor of methane for YOLL will therefore be 24.5*7.93E–07 = 1.94E–05 YOLL/kg methane.

Model 2, oxidant formation pathway

The characterisation factor is determined by an equivalency method using ethylene as a
reference.

Equivalency factor

The POCP (Photo Oxidant Creation Potential)for methane is 0.007 (Heijungs et al. in Lindfors et al.,1994)

Calculation of characterisation factor

The characterisation factor of ethylene for YOLL is 1.20E-05 YOLL/kg ethylene. This
means that the characterisation factor for methane will be 0.007*1.20E-05 = 8.40E-08
YOLL/kg.

Calculation of characterisation factor

The resulting characterisation factor from adding both pathways is 1.94E–05 + 8.40E-08 =
1.95E-05 YOLL/kg methane.

Literature Reference:
1. IPPC, “The 1994 Report of the Scientific Assessment Working Group of IPCC. Summary for policymakers”, WMO and UNEP, 1994 2. Lindfors, L.G.,Christiansen, K., Hoffman, L., Virtanen, Y., Juntilla, V. Leskinen, A., Hanssen, O-J., Rønning, A., Ekvall, T. and Finnveden, G., LCA-Nordic, Technical report No 10, Tema Nord 1995:503, Nordic Council of Ministers, Copenhagen 1994.
Methodological Range:
Including emissions from anywhere at the globe 1990 and considering a mean residence time of around 15 years for methane (IPCC, 1994), the environmental system be global. For the global warming pathways, the same system borders as for CO2 is relevant, i.e. 100 years.
Notes:

Existing Characterisation Factors of Methane 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 = *
CH4 1.95E-05 p yr/kg 2 pathways