Nielsen, O.-K., Winther, M., Gyldenkærne, S., Lyck, E., Thomsen, M., Hoffmann, L. & Fauser, P. 2009: Drivhusgasopgørelse på kommuneniveau. Beskrivelse af beregningsmetoder. Danmarks Miljøundersøgelser, Aarhus Universitet. 104 s. - Faglig rapport fra DMU nr. 700.
Summary
This report includes a description of methodologies, data and algorithms behind the inventories of greenhouse gases at the municipality level divided into sectors. The starting point for the sectors in this report is the sectors used for the official Danish emission inventories.
A simplified generalization of the equations used in emission calculations is based on the assumption that emissions of a given activity is estimated using data descriptive for the size of the activity multiplied by an emission factor pr unit of activity. Emissions of CH4 and N2O are converted to CO2 equivalents. In this project this generalization and these conversions are also the basis for all methodologies.
The sectors included in this report are: the collective power and heating, individual heating, mobile sources, transportation and machinery, industrial processes, solvents, agriculture, land use and waste depositing and wastewater. The methods include calculations of the greenhouse gases that are most important for the sectors. The importance is estimated from the national emission inventory. This report covers methodologies for the greenhouse gases CO2, CH4 and N2O. Due to the mentioned importance criteria for some sectors not all greenhouse gases are included.
As for the national inventories the calculation is built into several levels (Tiers) with increased requirements for municipalities regarding data. Tier 1 is mainly based on the Danish national greenhouse gas inventory data using appropriate distribution keys for a given activity into municipality level. Tier 2 is more detailed and includes emission factors used in the Danish national greenhouse gas inventories, for some sectors the emission factors are aggregated, while municipalities can enter their own activity data. At Tier 3, which is the most detailed level, there is - for some sectors - the opportunity to enter municipality specific emission factors and activity data. For other sectors Tier 3 is a further disaggregation of emission factors compared to Tier 2. Each municipality may use different tiers for different sectors depending on the data availability.
The methodological descriptions in this report explain the data and algorithms behind the CO2 calculator, while the IT program software user face is described in a separate project report. Eventually, the report outlines potentials for improvements and further development of the CO2 calculator.
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