Report

• Outline
• Authors

The Methodology Report will provide guidance on Short-lived Climate Forcer emissions which are anthropogenic, not including secondary human-induced substances, national, annual and will be reported in mass units for each individual emitted species. The report aims to cover:

• All IPCC inventory sectors with categories where the science is assessed to be robust enough to provide guidance for a Tier 1 methodological approach and have a relative contribution to the global/regional emissions of the species, species assessed and potentially covered by the new Methodology Report will be NOX, CO, NMVOCs, SO2, NH3, BC and OC, as well as emissions of primary particulate matter relevant for radiative forcing, as appropriate.
• Methane and halogenated species under Montreal Protocol and Kigali Amendment will not be covered since these are already addressed by the existing IPCC Guidelines.
• Given the uncertainties in the radiative forcing of H2 and taking note that H2 has not yet been well assessed as a climate forcer by IPCC WGI, H2 emissions relevant for radiative forcing are to be considered by the authors as an Appendix subtitled “Basis for future methodological development” subject to the IPCC’s Principles and Procedures on review and adoption.
• For NMVOCs, the methodology should provide estimates for total NMVOCs. The speciation of NMVOCs should be considered by authors, as appropriate.
• Anthropogenic emissions only, where anthropogenic refers to emissions from human activities and from managed land.
• Sources covered are those of anthropogenic emissions, where scientific evidence is available; while for others, guidance could be provided as a basis for future methodological development.
• Geographical and temporal coverage is national and annual level, and authors should also consider guidance on spatial and temporal disaggregation of SLCF emissions.