Report - DCE - Nationalt Center for Miljø og Energi

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The emission inventory basis for mobile sources is fuel consumption information
from the Danish energy statistics. In addition, background data for
road transport (fleet and mileage), air traffic (aircraft type, flight numbers,
origin and destination airports), national sea transport (fuel surveys, ferry
technical data, number of return trips, sailing time) and non-road machinery
(engine no., engine size, load factor and annual working hours) are used to
make the emission estimates sufficiently detailed. Emission data mainly
comes from the EMEP/EEA Air Pollutant Emission Inventory Guidebook
(EMEP/EEA, 2009). However, for railways, measurements specific to Denmark
are used.
In the Danish emission database, all activity rates and emissions are defined
in SNAP sector categories (Selected Nomenclature for Air Pollution), according
to the CollectER system. The emission inventories are prepared from a
complete emission database based on the SNAP sectors. The aggregation to
the sector codes used for both the UNFCCC and UNECE Conventions is
based on a correspondence list between SNAP and CFR/NFR classification
codes shown in Table 3.20 below (mobile sources only).
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Military transport activities (land and air) refer to the CRF/NFR sector
Other (1A5), while the Transport-Navigation sector (1A3d) comprises national
sea transport (ship movements between two Danish ports) and recreational
craft (SNAP code 0803).
For aviation, Landing and Take Off ((LTO) 1 refers to the part of flying,
which is below 1000 m. This part of the aviation emissions (SNAP codes
080501 and 080502) are included in the national emissions total as prescribed
by the UNECE reporting rules. According to UNFCCC the national emissions
for aviation comprise the emissions from domestic LTO (0805010) and
domestic cruise (080503). The fuel consumption and emission development
1 A LTO cycle consists of the flying modes approach/descent, taxiing, take off and
climb out. In principle the actual times-in-modes rely on the actual traffic circumstances,
the airport configuration, and the aircraft type in question.