The Norwegian emission inventory 2010

The Norwegian emission inventory is a joint undertaking between the Climate and Pollution Agency1 and Statistics Norway. Statistics Norway is responsible for the collection and development of activity data, and emission figures are derived from models operated by Statistics Norway. The Climate and Pollution Agency is responsible for the emission factors, for providing data from specific industries and sources and for considering the quality, and assuring necessary updating, of emisions models like e.g. the road traffic model and calculation of methane emissions from landfills. Emission data are used for a range of national applications and for international reporting. The Climate and Pollution Agency is responsible for the Norwegian reporting to United Nations Framework Convention on Climate Change (UNFCCC) and to United Nations Economic Commission Europe (UN-ECE). This report documents the methodologies used in the Norwegian emission inventory of greenhouse gases (GHG), acidifying pollutants, heavy metals (HM) and persistent organic pollutants (POPs). The documentation will also serve as a part of the National Inventory Report submitted by Norway to the United Nations Framework Convention on Climate Change (UNFCCC), and as documentation of the reported emissions to UNECE for the pollutants restricted by CLRTAP (Convention on Long-Range Transboundary Air Pollution). LULUCF is not considered in this report, see the National Inventory Report (Climate and Pollution Agency 2010) for documentation on this topic. This report replaces the previous documentation of the emission model, (Sandmo 2009), and is the latest annually updated version of a report edited by Britta Hoem in 2005. The most important changes since last year’s documentation are:  Emissions of CH4 and N2O from well testing of crude oil off shore have been included - these have previously not been estimated  Emissions of CH4 from enteric fermentation have increased for the whole period from 1990 as a result of the introduction of a new Tier 2 emission factor for reindeer  Updated data on C in soil have been used to calculate emissions of N2O from histosols, which has caused lower emissions for most years  A new, lower country-specific emission factor for inland combustion of natural gas has replaced the one previously used  The emission factors for NOx from ships have been revised, causing lower emissions for the whole time period from 1990. The change applies to all ships, in national navigation, fishing and military  Some figures reported from plants to the Climate and Pollution Agency have replaced earlier reported figures. Furthermore, there are lower emission figures for CH4 for all years since 1990 due to revisions of Statistics Norway’s waste statistics, but there are no methodological changes in the calculation of these emissions. There have also been several minor changes in the emission figures, e.g. due to changes in figures on energy combustion. Chapter 8 Recalculations gives a more thorough description of changes in the most recent emission calculations. The Norwegian Emission Inventory 2010; Documentation of methodologies for estimating emissions of greenhouse gases and long-range transboundary air pollutants is also available at http://www.ssb.no. 1