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Characterisation Method Information
Characterisation Method Name:
Mathane impact on wood
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: global warming and fertilisation pathways
Method Description:
Model

The characterisation factor is determined by an equivalency method using CO2 as a reference. There are two pathways for CO2s impact on forest growth. One is the global warming and the other is CO2 fertilisation. The CO2 fertilisation is more than 30 times as efficient as the global warming. Considering the GWP100 for methane being 24.5 and the equivalency for CO2 fertilisation being 46/16 = 2.88, the CO2 fertilisation pathway is still 10 times as efficient. Therefore the model will focus on the equivalency with CO2 in the fertilising aspect.

Equivalency factor

The equivalency for CO2 fertilisation was calculated above to 46/16 = 2.88. 46 represents the molecular weight of CO2 and 16 the molecular weight of methane. (Each methane molecule will give one CO2 molecules when it is oxidised). It is assumed that all methane is oxidised sooner or later to CO2 and water.

Calculation of characterisation factor

As the fertilisation pathway specific characterisation factor of CO2 for wood is 3.93E-02 kg wood/kg CO2 we obtain the pathway specific characterisation factor of formaldehyde to wood to 2.88*(-3.93E-02 ) = -1.13E-01 kg wood/kg methane.
Literature Reference:
Steen B (1999b): A systematic approach to environmental priority strategies in product development (EPS). Version 2000 Models and data of the default method CPM report Chalmers University of Technology Sweden
Methodological Range:
The pathway modelled is via global warming. The same system borders as for CO2 is used i.e 100 years.
Notes:

Existing Characterisation Factors of Mathane impact on wood
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Wood EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
CH4 -1.13E-01 kg/kg 2 pathways