New Zealand’s Greenhouse Gas Inventory 1990–2006

• Executive Summary
• Chapter 1: Introduction
• Chapter 2: Trends in greenhouse gas emissions
• Chapter 3: Energy
• Chapter 4: Industrial processes
• Chapter 5: Solvent and other product use
• Chapter 6: Agriculture
• Chapter 7: Land use, land-use change and forestry (LULUCF)
• Chapter 8: Waste
• Chapter 9: Other
• Chapter 10: Recalculations and improvements
• References
• Annex 1: Key categories
• Annex 2: Methodology and data collection for estimating emissions from fossil fuel combustion
• Annex 3: Detailed methodological information for other sectors
• Annex 4: CO₂ reference approach and comparison with sectoral approach, and relevant information on the national energy balance
• Annex 5: Assessment of completeness and (potential) sources and sinks of greenhouse gas emissions and removals excluded
• Annex 6: Quality assurance and quality control
• Annex 7: Uncertainty analysis (Table 6.1 of the IPCC Good Practice Guidance)
• Annex 8: Supplementary information under Article 7.1 of the Kyoto Protocol

Annex 1: Key categories

A1.1 Methodology used for identifying key categories

The key categories in the New Zealand inventory have been assessed according to the methodologies provided in good practice guidance (IPCC, 2000). The methodology applied was determined using the decision tree shown in Figure A1.1.

For the 2006 inventory the Tier 1 level and trend assessment were applied including the LULUCF sector and excluding the LULUCF sector (IPCC 2000, 2003). The “including LULUCF” level and trend assessments are calculated as per equations 5.4.1 and 5.4.2 of GPG-LULUCF. The “excluding LULUCF” level and trend assessments are calculated as per equations 7.1 and 7.2 of good practice guidance (IPCC, 2000). Key categories are defined as those categories whose cumulative percentages, when summed in decreasing order of magnitude, contributed 95 per cent of the total level or trend.

A1.2 Disaggregation

The classification of categories follows the classification outlined in Table 7.1 of good practice guidance (IPCC, 2000) by:

• Identifying categories at the level of IPCC categories using CO₂ equivalent emissions and considering each greenhouse gas from each category separately.

• Aggregating categories that use the same emission factors.

• Including LULUCF categories at the level shown in GPG-ULUCF Table 5.4.1.

There was one modification to the suggested categories to reflect New Zealand’s national circumstances. The “fugitive emissions from fuels–oil and natural gas” category was divided into two categories: “fugitive emissions from oil and gas operations” and “fugitive emissions from geothermal operations”. This is to reflect that New Zealand generates a significant amount of energy from geothermal sources that cannot be included as oil or gas operations.

A1.3 Tables 7.A1–7.A3 of the IPCC Good Practice Guidance

Table A1.1 Results of the key category level analysis for 99 per cent of the total emissions and removals for New Zealand in 2006. Key categories are those that comprise 95 per cent of the total.

(a) Tier 1 Category Level Assessment – including LULUCF
IPCC Categories	Gas	2006	Level	Cumulative
Forestland remaining forest land	CO2	25859.65	23.9	23.9
Emissions from enteric fermentation in domestic livestock	CH4	24110.67	22.3	46.2
Mobile combustion – road vehicles	CO2	12606.68	11.7	57.8
Emissions from stationary combustion – gas	CO2	7938.09	7.3	65.2
Emissions from agricultural soils – animal production	N2O	7609.13	7.0	72.2
Emissions from stationary combustion – solid	CO2	6754.95	6.2	78.5
Indirect emissions from nitrogen used in agriculture	N2O	3387.22	3.1	81.6
Emissions from stationary combustion – liquid	CO2	3008.08	2.8	84.4
Conversion to forest land	CO2	2127.72	2.0	86.3
Direct emissions from agricultural soils	N2O	1736.81	1.6	87.9
Emissions from iron and steel industry	CO2	1622.36	1.5	89.4
Emissions from solid waste disposal sites	CH4	1475.39	1.4	90.8
Mobile combustion – aviation	CO2	1114.18	1.0	91.8
Emissions from manure management	CH4	743.13	0.7	92.5
Cropland remaining cropland	CO2	679.95	0.6	93.1
Other-emissions from liming	CO2	676.11	0.6	93.8
Conversion to grassland	CO2	661.04	0.6	94.4
Fugitive emissions from oil and gas operations	CO2	657.47	0.6	95.0
Emissions from substitutes from ozone depleting substances	HFCs & PFCs	601.35	0.6	95.5
Emissions from cement production	CO2	560.66	0.5	96.1
Emissions from aluminium production	CO2	552.76	0.5	96.6
Fugitive emissions from coal mining and handling	CH4	450.20	0.4	97.0
Emissions from ammonia/urea production	CO2	381.63	0.4	97.3
Mobile combustion – marine	CO2	324.89	0.3	97.6
Fugitive emissions from geothermal operations	CO2	305.68	0.3	97.9
Fugitive emissions from oil and gas operations	CH4	302.17	0.3	98.2
Emissions from hydrogen production	CO2	227.76	0.2	98.4
Emissions from wastewater handling	CH4	209.88	0.2	98.6
Emissions from wastewater handling	N2O	167.40	0.2	98.8
Mobile combustion – rail	CO2	155.16	0.1	98.9
Mobile combustion – road vehicles	N2O	136.78	0.1	99.0

 

Table A1.2 Results of the key category level analysis for 99 per cent of the total emissions and removals for New Zealand in 1990. Key categories are those that comprise 95 per cent of the total.

(a)Tier 1 Category Level Assessment – including LULUCF
IPCC Categories	Gas	Base year estimate Gg	Level assessment	Cumulative total
Emissions from enteric fermentation in domestic livestock	CH4	21810.44	25.6	25.6
Forestland remaining forest land	CO2	21397.92	25.1	50.6
Emissions from stationary combustion – gas	CO2	7691.14	9.0	59.7
Mobile combustion – road vehicles	CO2	7534.97	8.8	68.5
Emissions from agricultural soils – animal production	N2O	6850.46	8.0	76.5
Emissions from stationary combustion – solid	CO2	3148.78	3.7	80.2
Indirect emissions from nitrogen used in agriculture	N2O	2702.16	3.2	83.4
Emissions from stationary combustion – liquid	CO2	2546.55	3.0	86.4
Emissions from solid waste disposal sites	CH4	2121.53	2.5	88.9
Emissions from the iron and steel industry	CO2	1312.27	1.5	90.4
Mobile combustion – aviation	CO2	772.83	0.9	91.3
Conversion to grassland	CO2	704.22	0.8	92.1
PFCs from aluminium production	PFC	641.68	0.8	92.9
Emissions from manure management	CH4	578.59	0.7	93.6
Cropland remaining cropland	CO2	538.67	0.6	94.2
Direct emissions from agricultural soils	N2O	487.19	0.6	94.8
Emissions from aluminium production	CO2	443.27	0.5	95.3
Emissions from cement production	CO2	441.67	0.5	95.8
Other (including liming)	CO2	373.83	0.4	96.2
Fugitive emissions from geothermal operations	CO2	357.34	0.4	96.7
Emissions from ammonia/urea production	CO2	274.53	0.3	97.0
Fugitive emissions from coal mining and handling	CH4	272.13	0.3	97.3
Fugitive emissions from oil and gas operations	CO2	263.48	0.3	97.6
Fugitive emissions from oil and gas operations	CH4	258.74	0.3	97.9
Mobile combustion – marine	CO2	247.82	0.3	98.2
Emissions from wastewater handling	CH4	222.73	0.3	98.5
Emissions from hydrogen production	CO2	152.29	0.2	98.6
Emissions from wastewater handling	N2O	146.92	0.2	98.8
Conversion to forest land	CO2	141.28	0.2	99.0

 

Table A1.3 Results of the key category trend analysis for 99 per cent of the total emissions and removals for New Zealand in 2006. Key categories are those that comprise 95 per cent of the total.

(a) Tier 1 Category Trend Assessment – including LULUCF
IPCC Categories	Gas	Base year estimate Gg	2006 estimate Gg	Trend assessment	Contribution to trend	Cumulative total
Emissions from enteric fermentation in domestic livestock	CH4	21810.44	24110.67	0.034	16.0	16.0
Mobile combustion – road vehicles	CO2	7534.97	12606.68	0.032	15.2	31.2
Emissions from Stationary combustion – solid	CO2	3148.78	6754.95	0.029	13.5	44.7
Conversion to forest land	CO2	141.28	2127.72	0.020	9.4	54.2
Emissions from stationary combustion - gas	CO2	7691.14	7938.09	0.018	8.4	62.6
Emissions from solid waste disposal sites	CH4	2121.53	1475.39	0.012	5.8	68.3
Direct emissions from agricultural soils	N2O	487.19	1736.81	0.011	5.4	73.8
Forest land remaining forest land	CO2	21397.92	25859.65	0.011	5.0	78.8
Direct emissions from agricultural soils – animal production	N2O	6850.46	7609.13	0.010	4.9	83.7
PFCs from aluminium production	PFC	641.68	82.49	0.007	3.5	87.2
Emissions from substitutes for Ozone depleting substances	HFCs & PFCs	0.00	601.35	0.006	2.9	90.1
Fugitive emission from oil and gas operations	CO2	263.48	657.47	0.003	1.6	91.7
Conversion to grassland	CO2	704.22	661.04	0.002	1.1	92.7
Other (including liming)	CO2	373.83	676.11	0.002	1.0	93.7
Emissions from stationary combustion – liquid	CO2	2546.55	3008.08	0.002	0.9	94.7
Fugitive emissions from geothermal operations	CO2	357.34	305.68	0.001	0.7	95.4
Mobile combustion – aviation	CO2	772.83	1114.18	0.001	0.7	96.1
Fugitive emissions from coal mining and handling	CH4	272.13	450.20	0.001	0.5	96.6
Conversion to cropland	CO2	37.35	123.31	0.001	0.4	96.9
Emissions from wastewater handling	CH4	222.73	209.88	0.001	0.3	97.3
Mobile combustion – rail	CO2	78.01	155.16	0.001	0.3	97.6
Mobile combustion – road vehicles	N2O	64.04	136.78	0.001	0.3	97.8
Emissions from ammonia/urea production	CO2	274.53	381.63	0.000	0.2	98.0
Emissions from hydrogen production	CO2	152.29	227.76	0.000	0.2	98.2
Mobile combustion – road vehicles	CH4	69.00	52.19	0.000	0.2	98.4
Emissions from iron and steel industry	CO2	1312.27	1622.36	0.000	0.1	98.5
Non-CO2 emissions from stationary combustion	N2O	75.67	120.94	0.000	0.1	98.6
Conversion to settlement	CO2	97.16	97.16	0.000	0.1	98.7
Emissions from limestone & dolomite use	CO2	17.13	44.70	0.000	0.1	98.8
Fugitive emissions from oil and gas operations	CH4	258.74	302.17	0.000	0.1	99.0

previous next