IPCC TFI work on
Short Lived Climate Forcers (SLCFs)
UN Climate Change Conference
5 December 2019
Madrid, Spain
Kiyoto Tanabe, IPCC TFI Co-Chair

Background: Emerging Issue - SLCFs
o Recently, the potential importance of reducing emissionsof short-lived climate forcers (SLCFs) such as methane,black carbon, and precursors of tropospheric ozone isrecognized more and more
• to mitigate climate change;• to improve air quality; and therefore• to bring near-term co-benefits in terms of human health,agricultural yields and ecosystems.

Background (2017-2018)
2017
IPCC-46 (Montreal, Canada) decided to approve the proposal
for an expert meeting on SLCFs to discuss issues onestimation of emissions and estimations of climate effects
 Decision IPCC/XLVI-6

2018
An expert meeting on SLCFs was organized jointly by IPCCTFI and WGI. It took place in Geneva, Switzerland in May 2018
 The meeting report is at:https://www.ipcc-nggip.iges.or.jp/public/mtdocs/1805_Geneva.html

Expert Meeting on SLCFs – May 2018
Some conclusions and recommendations of the expert
meeting on SLCFs:• Science on SLCFs has advanced. Careful consideration isrequired in consolidating existing inventory methodology• All SLCFs should be considered in the future TFI work Black Carbon, Organic Carbon, PM2.5, Nox, CO, NMVOC (including
BVOC), SO2 and NH3 were considered at this expert meeting CH4 and HFCs were not considered because they are already coveredin the 2006 IPCC Guidelines for National Greenhouse Gas Inventories• SLCFs reporting should be in mass units, not in CO2equivalents• IPCC can play an important role and has relevant experienceand resources to develop guidance for national SLCFs
inventories

IPCC-49 (Kyoto, Japan) – May 2019
IPCC-49 decided to approve that the IPCC Task Force on
National Greenhouse Gas Inventories produces an IPCC
Methodology Report on Short-lived Climate Forcers following
the Appendix A to the Principles Governing IPCC work
 Decision IPCC-XLIX-7

IPCC-49 decided to approve the revised budget for 2019 andthe proposed budget for 2020, noted the forecast budget for
2021 and the indicative budget for 2022

 Decision IPCC-XLIX-8

IPCC-49 Decision-XLIX-7 on SLCFsApproach• The preparatory work for the Methodology Report (including supporting materials andscoping) is completed as soon as possible, starting in the AR6 cycle. Followed byfurther methodological development in the AR7 cycle

Output and Timeline• Expert meetings will produce a series of supporting materials to be published after
each meeting but no later than 2022
• These supporting materials will be used to inform the scoping of methodological work
for SLCFs• The scoping meeting will take into consideration the work on SLCFs underway in thereports of Working Group I (April 2021) and III (July 2021)• The outline will be presented for approval to the Panel soon after the scoping meeting

Required Activities••••

Technical analysis work by TFI TSU with other experts
3-4 Expert meetings
Scoping Meeting
Approval of outline by the PanelTFB-31 (Osaka, Japan) – November 2019
At the 31st meeting of IPCC Task Force Bureau on National Greenhouse Gas
Inventories (TFB-31), TFB considered Decision IPCC-XLIX-7 on SLCFs andagreed on the following work plan of IPCC TFI:
2020
March: Expert meeting on AFOLU and Waste – Rome, Italy or Bangkok, Thailand
June-July: Expert meeting on Energy and IPPU – Istanbul, Turkey

2021
First half: Expert meeting on knowledge gaps (all sectors)
Second half: Exerting meeting on any follow-up issues, outcomes of WGI and WGIII;(possibly) a preliminary draft of the Outline of Methodology Report on SLCFs

2022
First half: Scoping meeting
Second half: Approval of the Outline at IPCC-XX Session

A new Methodology Report on SLCFs will be produced after 2023…
 All dates and venues are to be confirmed

Thank you
https://www.ipcc-nggip.iges.or.jp/index.html