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Characterisation Method Information
Characterisation Method Name:
Mathane impact on crop
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: oxidant pathway and global warming pathway
Method Description:
Model 1, 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 crop loss is determined to 4.86 kg crop/kg ethylene. This gives an oxidant pathway specific characterisation factor of methane for crop of 0.007*4.86 = 0.0340 kg crop/kg methane.

Model 2, 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 crop loss is 7.56E–04 kg crop/kg CO2. Thus the
characterisation factor of methane for crop loss is 24.5*7.56E–04 = 1.85E–02 kg crop/kg methane.

Calculation of characterisation factor

The total characterisation factor for both pathways is thus 0.0340 + 0.0185 = 0.0525 kg crop/kg methane.
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 (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 Mathane impact on crop
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Crop EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
CH4 0.0525 kg/kg 2 pathways