This publication is no longer current or has been superseded.
In this current submission, the format of the inventory report is restructured to fit the format outlined in the UNFCCC reporting guidelines (UNFCCC/2002/CP/8).
Improvements in the 2002 inventory include:
The overall effect of all recalculations is shown in Figure 9.1.1. The recalculations change the level of emissions reported in the 2003 submission for 1990-2000 by an average of 0.56%. There is a 1.7% change in the 2001 inventory largely due to the replacement of provisional animal numbers with actual animal numbers in the agriculture sector. This occurs every year of the inventory. Changes in individual sectors are discussed in the following sections. Solvents are not included because of the very low level of emissions throughout the time-series.
New Zealand reviewed all emission factors used in the energy sector in 2003 (Hale and Twomey, 2003). The review was commissioned based on recommendations from New Zealand's inventory QA procedures (Clarkson, 2001, 2002). The results of the emission factors review were assessed by an independent review panel of New Zealand energy experts prior to review recommendations being used in the inventory. In accordance with Good Practice (IPCC, 2000), where there was a significant difference between country-specific and IPCC default emission factors, and a defensible explanation could not be obtained, New Zealand reverted to the IPCC default emission factors (refer to Annex 2 for detailed information). The 2002 inventory incorporates the emission factors recommended by the review and agreed by the review panel. The implications on emission levels and the trend in emissions from the energy sector are shown in Figure 9.1.2.
Officials at the MED conducted an investigation into the effect of the new emission factors on the 1990 and 2002 inventory data. The analysis compared the previous emission factors with the new emission factors. The analysis identified that for:
There are changes in the estimates of non-CO2 emissions in the industrial processes sector in the 2002 inventory. The changes resulted from new sources being identified in the survey and a critical examination of previous emission estimates. All revisions are back-calculated through to 1990 (Figure 9.1.3).
The major changes in the industrial processes sector were:
Every year of inventory there is a recalculation for the previous year as the provisional animal population is updated with the actual population. This causes an increase in the level of emissions reported (Figure 9.1.4). The other recalculation for 2004 was the inclusion of emissions from savanna burning.
New proportions of area by NEFD regime have been used to weight the carbon yield in the 2002 inventory. Area data and carbon yields underlying the models in recent reports are similar to those used in previous inventories. The difference in net managed forest CO2 removals between this and the previous inventory are generally of the order of less than 2% (Figure 9.1.5)
The emissions for 1990-2001 from solid waste disposal sites are recalculated based on improved population data from Statistics New Zealand. The effect of the improved population data on the waste sector is shown in Figure 9.1.6.
In the 2003 submission, the methodology used to estimate CH4 emissions from ruminants was upgraded from Tier 1 to a Tier 2 approach consistent with good practice.
As part of the on-going improvement to estimates of N2O from agricultural sources, a complete recalculation of the time-series was carried out using revised emission factors from IPCC (2000), some revised country specific emission factors and new annual nitrogen excretion rates for the most significant animal classes.
In the 2002 submission for the year 2000,emissions from solid waste disposal were upgraded to Tier 2 and emissions from small sources previously unreported (lime and dolomite) were included.
In the 2001 submission for the year 1999, estimates of emissions of the fluorinated gases (HFCs, PFCs and SF6) gases were upgraded to IPCC (2000) Tier 2 methodology.