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

Annex 1 Key source analyses
Description of the methodology used for identifying key sources
The key source analysis is carried out according to the IPCC Good Practice Guidance
(GPG). The base year in the analysis is the year 1990 for the greenhouse gases CO 2 ,
CH 4 , N 2 O and 1995 for the greenhouse F-gases HFC, PFC and SF 6 . The base year is
unadjusted to electricity trade. The analysis was made for the inventory for the year
2003.
The present key source analysis follows the same approach as the analyses for the
years 2000, 2001 and 2002 as presented in the NIR2002, 2003 and 2004 respectively.
The approach is a Tier 1 quantitative analysis. As suggested in the Good Practice
Guidance the analysis is carried out without considering LULUCF.
The level assessment of the key source analysis is a ranking of the source categories in
accordance to their contributions to the national total of greenhouse gases calculated
in CO 2 -equivalent units. The level key sources are found from the list of source categories
ranked according to their contribution in descending order. Level key sources
are those from the top of the list which sum constitutes 95% of the national total.
The trend assessment of the key source analysis is a ranking of the source categories
according to their contribution to the trend of the national total of greenhouse gases
calculated in CO 2 -equivalent units from the base year to the year considered. The
trend of the source category is calculated relative to the trend of the national totals
and the trend is weighted with the contribution according to the level assessment.
The ranking is performed in descending order on this contribution to trend. As for
the level assessment the cut of line is 95% for the sum of contribution to the trend and
the source categories from the top of the list to the cut of line are trend key sources.
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The starting point for the choice of source categories is the one presented in the GPG
as Table 7.1. This table constitutes a suggested list of source categories for the key
source analysis. It is mentioned in the GPG that categories for the key source analysis
should be chosen in a way that emissions from a single category are estimated with
the same method and the same emission factor. Therefore for categories in this table,
which in our Corinair database are composed of activities with different emission
factors or estimated with different methods splits, were made accordingly. It is in the
energy sector with its major emission contributions that further splits are made as
compared to the Table 7.1 in the Good Practice Guidance.
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