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Characterisation Method Information
Characterisation Method Name:
Mathane impact on severe morbidity
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: global warming pathway and oxidant pathway
Method Description:
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 for CO2 is determined to 3.53E–07 person-years/kg, which means that the characterisation factor of methane for severe morbidity is
24.5*3.53E–07 = 8.65E–06 person-years/kg.

Model 2, oxidant 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. i Lindfors et. al., 1994)

Calculation of characterisation factor

The oxidant pathway specific characterisation factor of ethylene for severe morbidity is determined "Ethylene impact on severe morbidity" to 6.76E-07 person-years/kg ethylene. This gives an oxidant pathway specific characterisation factor of methane for severe morbidity of 0.007*6.76E-07 = 4.73E-09 person-years/kg.

Calculation of characterisation factor

The resulting characterisation factor from adding the two pathways is 8.65E–06 +
4.73E-09 = 8.65E-06 person-years/kg
Literature Reference:
1. 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. 2. IPPC, “The 1994 Report of the Scientific Assessment Working Group of IPCC. Summary for policymakers”, WMO and UNEP, 1994
Methodological Range:
Including emissions from anywhere at the globe 1990 and considering a mean residence time of around 15 years for methane and its reaction products (IPCC, 1994), the environmental system be global. No effects on biodiversity, resources or aesthetics are included. For the global warming pathways, the same system borders as for CO2 is relevant, i.e. 100 years.
Notes:

Existing Characterisation Factors of Mathane impact on severe morbidity
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Severe morbidity EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
CH4 8.65E-06 p yr/kg 2 pathways