INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS

INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP Volume I General Guidance and Reporting Bonn, 18 may 2006 Newton Paciornik Ministry of Science and Technology of Brazil

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE General Guidance Development NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Built on GPG 2000 and GPG LULUCF üQuantifying uncertainties in practice üMethodological choice (key sources) üRecalculation üQuality Control / Quality Assurance Ø 2006 Guidelines WMO üIntroductory section on GHG inventories and steps needed for preparation üExtended advice on data collection 2

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Inventory Quality – Good Practice NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Transparency üsufficient and clear documentation üpossible replication Ø Completeness üall categories of sources and sinks üall gases WMO ügeographical coverage ümissing elements clearly documented and justified 3

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Inventory Quality – Good Practice NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Consistency üdifferences between different years estimations should reflect real changes ücareful treatment of methodological changes Ø Comparability (among countries) üclassification and definition of categories of emissions and removals WMO üuse of reporting guidance and tables 4

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Inventory Quality – Good Practice NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Accuracy WMO üemissions and removals are neither overnor underestimates so far as can be judged and in which uncertainties are reduced as far as practicable 5

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Estimation Methods – Basic concepts NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Tiers üMethods are presented in 3 tiers Tier 1 – Basic method using available national and international statistics and default emission factors Tier 2 – Intermediate method using country specific data WMO Tier 3 – Higher complexity methods with more demanding data requirements and generally more accurate 6

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Estimation methods – Basic concepts NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Key categories approach üused to identify categories that have a significant influence on a country’s GHG inventory in terms of level, trend or uncertainty of emissions and removals Ø Decision trees WMO ühelp in selection of appropriate tiered methodology based on assessment of key categories 7

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Data collection üData collection planning üUsing existing data üGenerating new data üEmission factors and direct measurements üActivity data WMO üExpert elicitation and surveys 8

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Uncertainty assessment üConceptual basis üCauses of uncertainty üReducing uncertainty üQuantifying uncertainties WMO üCombining uncertainties 9

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Key category analysis üBasis for methodological choice and prioritizing resources üGeneral approach (level and trend) Guidance on disaggregation level üApproach 1 (level contribution) üApproach 2 (level +uncertainty) WMO üQualitative criteria 10

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Time series consistency üMethods for ensuring time-series consistency in cases where it is not possible to use the same method/data for the entire period üGuidance in recalculation of estimates for previous years WMO üResolving data gaps 11

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Quality assurance/Quality control üDeveloping a QA/QC plan üQC procedures assess and maintain quality during inventory compilation üQA procedures review procedures by external personnel üVerification procedures WMO external methods and data 12

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Precursors and indirect N 2 O üCross-sectoral guidance üLink to EMEP/Corinair WMO üIndirect N 2 O from atmospheric deposition of NOx and NH 3 13

UNEP INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE Compiling an Inventory General Guidance NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME Ø Reporting üCoverage – category definition üNotation keys üUnits üReporting tables Annual inventory Trend tables by gas WMO Uncertainties and key categories tables 14