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Characterisation Method Information
Characterisation Method Name:
P-tot impact on NEX
Date Completed:
Principal Method Name:
EPS: eutrofication pathway
Method Description:
NEX is Normalised EXtinction of species.


The characterisation factor is determined by the empirical method.

Category indicator value in system considered

10% of the threat to bio-diversity in Scandinavia are due to eutrofication. On a global scale, the threat to bio-diversity is assumed to be less, 1%. The indicator value is thus 0.01NEX.

Contribution to category indicators value from a flow unit

Global emission of phosphorous to water is estimated to be in the order of 2E+9 kg, but
is only contributing to a minor degree to eutrofication effects (10%, in lakes)

Calculation of characterisation factor

0.01/210 9 *0.1 = 5E-13 NEX/kg P-tot.

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:
All lakes, surface waters and oceans on the globe 1990, but with a focus on lakes and surface waters, where phosphorus often is growth rate limiting.

Existing Characterisation Factors of P-tot impact on NEX
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor NEX EPS/2000
Type = Emission
Direction = Output
Media = Water
Geography = *
P-tot 5E-13 NEX/kg eutrofication pathway