Denmark's National Inventory Report 2005 - Submitted under the ...

3.2.3.1 Methodology
Greenhouse gases
The Danish uncertainty estimates for GHGs are based on the Tier 1 approach in IPCC Good Practice
Guidance (IPCC 2000). The uncertainty levels have been estimated for the following emission
source subcategories within stationary combustion:
• CO 2 emission from each of the applied fuel categories
• CH 4 emission from gas engines
• CH 4 emission from all other stationary combustion plants
• N 2 O emission from all stationary combustion plants
The separate uncertainty estimation for gas engine CH 4 emission and CH 4 emission from other
plants does not follow the recommendations in the IPCC Good Practice Guidance. Disaggregation
is applied, because in Denmark the CH 4 emission from gas engines is much larger than the emission
from other stationary combustion plants, and the CH 4 emission factor for gas engines is estimated
with a much smaller uncertainty level than for other stationary combustion plants.
Most of the applied uncertainty estimates for activity rates and emission factors are default values
from the IPCC Reference Manual. A few of the uncertainty estimates are, however, based on national
estimates.
Table 3.14 Uncertainty rates for activity rates and emission factors
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È
Stationary Combustion, Coal CO2 1
1)
Stationary Combustion, BKB CO2 3
1)
Stationary Combustion, Coke oven coke CO2 3
1)
Stationary Combustion, Petroleum coke CO2 3
1)
Stationary Combustion, Plastic waste CO2 5
4)
Stationary Combustion, Residual oil CO2 2
1)
Stationary Combustion, Gas oil CO2 4
1)
Stationary Combustion, Kerosene CO2 4
1)
Stationary Combustion, Orimulsion CO2 1
1)
Stationary Combustion, Natural gas CO2 3
1)
Stationary Combustion, LPG CO2 4
1)
Stationary Combustion, Refinery gas CO2 3
1)
Stationary combustion plants, gas engines CH4 2,2
1)
Stationary combustion plants, other CH4 2,2
1)
Stationary combustion plants
1) IPCC Good Practice Guidance (default value)
2) Kristensen (2001)
3) Jensen & Lindroth (2002)
4) NERI assumption
N2O 2,2
1)
70
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È
5 3)
5 1)
5 1)
5 1)
5 4)
2 3)
5 1)
5 1)
2 3)
1 3)
5 1)
5 1)
40 2)
100 1)
1000 1)
Other pollutants
With regard to other pollutants, IPCC methodologies for uncertainty estimates have been adopted
for the LRTAP Convention reporting activities (Pulles & Aardenne 2001). The Danish uncertainty
estimates are based on the simple Tier 1 approach.
The uncertainty estimates are based on emission data and uncertainties for each of the main SNAP
sectors. The assumed uncertainties for activity rates and emission factors are based on default val-