General Inventory Issues
BOG Report
3rd IPCC Expert Meetingon Short-Lived Climate Forcers (SLCFs)

Virtual sessions, 11-15 April 2022

BOG ReportApplicability of General Guidance Provided inthe 2006 IPCC Guidelines and its 2019 Refinement
1.

Key category analysis (KCA)

2.

Approaches to Data Collection and Time Series Consistency

3.

Verification

BOG Report1. Key Category Analysis (KCA)
SLCF and direct GHGs should not be combined

1.a. Quantitative approaches(if applicable common metric is not available for all SLCF gases)• KCA should be performed on a pollutant-by-pollutant basis via
two-step process– Step 1: Quantitative analysis in mass unit
– Step 2: Use of health impact and radiative forcing metrics –(other weighting or equivalency metrics)• IPCC and EMEP KCA guidance are a good starting point and willneed to take into consideration– Approach for combining pollutants– Feasibility of an 80% threshold

BOG Report1. Key Category Analysis (KCA)
1.b. Qualitative criteria• General overview text on KCA should also discuss how
qualitative analysis options can be used to identify and prioritizekey areas for improvement.
• Apply IPCC/EMEP qualitative approaches on a pollutant-bypollutant basis• Compile list of additional data sources and information to support
qualitative analysis, for examples– Health impacts– Impact of regional and local practices– Mitigation and abatement technologies• Consider proxy dataset and how it can be applied to other regions
to support qualitative assessment.

BOG Report2. Approaches to Data Collection andTime Series Consistency
2.c. Addressing finer temporal and spatial distribution• SLCF information should at minimum be national and on anannual basis• National circumstances may require finer temporal andspatial distribution• Consider tiered approach for spatial allocation taking into
account that tier 1 should be applicable to all countries• Consult with IPCC scientists and modellers to determine
relevant level of temporal and spatial resolution

BOG Report2. Approaches to Data Collection andTime Series Consistency
2.d. Implications in terms of good practice for data collection• Provide general guidance on data quality, data collection
and use of proxy data
• A good starting point is Chapter 2 Approaches to DataCollection, Volume 1 of the 2019 Refinement.
• Additional guidance may be required to:– Address data gaps and accessibility, with a focus on developing
countries' data needs– Ensure the quality of surface, point source and roadmeasurement results for inventory comparison and identificationof areas for improvement

BOG Report2. Approaches to Data Collection andTime Series Consistency
2.e. Implications on time series consistency• No need to prescribe a long timeline for SLCF
inventories.
• Recognise possible step changes to time series due tovarious factors such as– impact of AP/SLCF regulations– changes to country specific practices

BOG Report

3. Verification
3.f. Verification with atmospheric observation• Recognise limited verification usage of current atmosphericobservation and satellite data

– Atmospheric concentration measurements of SLCF are notcomparable to SLCF emissions.
– Concentration of SLCF in the atmosphere is influenced byseasonal weather condition, temperature, wind, mixing, etc.

• Atmospheric observation and satellite data may be useful in
identifying
gaps
andhotspotstosupport
additional research and data collection.

BOG Report

3. Verification
3.g. Regional/global independent monitoring system/dataset availability• Provide guidance on the applicability and usage of global
databases, e.g. biomass burning for certain regions– Global inventories such as EDGAR may be used as a starting
point for inventory comparison purposes but not for verification
purposes.

• Consider guidelines for in-situ measurements
correlation approaches for comparison purposes.

and• Compile list of additional independent data sources for local
and regional comparison

BOG ReportAny Questions?

BOG Report