GEIA Working Groups, Overarching Activities & Collaborations

GEIA's efforts in emissions analysis are advanced by working groups on specific topics, overarching activities, and through collaborations with other initiatives, science teams, and agencies. Additional working groups will be formed as GEIA-facilitated dialogs identify evolving emissions challenges and establish paths for translating these challenges into new emissions databases.

GEIA Working Groups - Updates

COVID-19 Emissions Working Group (COVID19-WG)

Overview   To control the spread of the COVID-19 disease, governments are implementing emergency measures going from light social distancing to strict lockdowns, depending on the country. As a consequence, many industries, businesses and transportation networks are being impacted, which results in an unprecedented drop of anthropogenic emissions, including of both criteria air pollutants and greenhouse gases.  The use of ground-based and satellite observational datasets is being widely used to monitor and evaluate the impact ofthe COVID-19 outbreak on pollution levels and climate. However, a complete understanding requires also the quantification of emission changes from primary pollutants, which can later be used for modelling purposes. This quantification comes with a series of challenges, including: the heterogeneous impact of the COVID-19 restrictions across countries and pollutant sectors, the need to use near-real-time activity data that captures the precise timing of changes in emissions in different regions and sectors.

Key points:

  • The focus of the WG will be global and include both criteria and GHG pollutants
  • The activities should cover not only the 1st lockdown period, but also reopening phases, subsequent lockdowns, as well as the transition period towards a post-pandemic situation.
  • The WG will provide guidance for the compilation of COVID-19 emission inventories. The guidance should target not only emission modellers but also data providers and inverse modellers (e.g. coordination with the AMIGO initiative)
  • The WG will use the best available science to compile and provide a rigorous mosaic of regional and global COVID-19 emissions for the modelling community.
  • We anticipate the WG to be a multi-year effort given the size and duration of the COVID-19 pandemic.

Priorities     Priorities of the COVID19-WG are divided according to time frames:

·      short-term:

o   To identify key regional and global experts currently working on the quantification of COVID-19 emissions and create a network where information, data, knowledge and experience can be exchanged.

o   To identify, review and facilitate access through the ECCAD system to the latest available COVID-19 emission inventories.

·      mid-term:

o   To identify and assess the methods and proxies used to compute the emission changes for the different sectors in developed and developing countries

o   To provide sector-by-sector guidance on the compilation of COVID-19 emissions and its adaptation for air quality modelling

o   To perform intercomparison exercises between COVID-19 emission inventories (global versus regional and regional versus regional)

·      long-term:

o   To develop and evaluate a mosaic of global and regional COVID-19 emission adjustment factors to quantify emission changes and perform modelling studies

Working Group Co-Chairs:  Marc Guevara, Barcelona Supercomputing Center, Earth Sciences department,

Brian McDonald, National Oceanic and Atmospheric Administration Chemical Sciences Laboratory,     


GEIA China Emissions Working Group

Organizing the sharing of emissions methodology and data and promoting community efforts in emission inventory development for China. Chair: Kebin He;  GEIA Steering Committee Member: Yuxuan Wang


GEIA NMVOC Emissions Working Group

GEIA’s Non-Methane Volatile Organic Compounds (NMVOC) Emissions Working Group is coordinating efforts on the evaluation and improvement of the representation of  in emission inventories, including speciation, sector contributions, and total emissions. The Working Group is currently focused on a review of NMVOC speciation and source sector contributions. The review will examine existing analyses comparing inventory emission ratios of NMVOCs to CO to measured ratios of these species in urban areas around the globe. More details of this activity can be found here. If you are interested in joining the WG or participating in this activity, please get in touch!

Chair: Erika von Schneidemesser, IASS, and Hugo Denier van der Gon, TNO


Latin America and Caribbean GEIA Working Group

Contacts: Nicolas Huneeus, Laura Dawidowski, Néstor Rojas

Priorities of the LAC-GEIA Working Group are:

•       Building/developing/improvement of emission inventories considering specific conditions in Latin America, for each sector with high spatial resolution in particular for cities.

•       Build a community where information, data, knowledge and experience can be exchanged contributing to the development/improvement/evaluation of inventories.

•       Evaluate and check consistency of inventories and base information.

•       Create a regional unified database including all information (inventories and base information) and provide the tools to access it. Develop strategies to overcome information shortage.

•       Identify key areas of needed research for emissions estimation for South America.

•       Create a link to decision makers, public policy and funding institutions.

The WG will also inform GEIA’s global emissions community about the best and latest emissions information in the region, and provide stronger connections between the global and regional atmospheric scientific and policy communities.


Urban Emissions Working Group

Contact: Leonor Tarrasón

This working group is seeking to:
•Bring together techniques for urban emissions characterization
•Build capacity in megacities around the world
GEIA Africa Emissions Working Group
Contacts : Cathy Liousse, Mogesh Naidoo, Sekou Keita

GEIA’s Africa Emissions WG is promoting community efforts in emission development for Africa. The working group consists of a list of members, which is in construction, to create a network on emissions with strong connections between experts (African and non-African) on African emissions, representatives of international groups and projects such as IGAC, IGAC-Africa ANGA, WMO, ILEAPS, AMIGO, MAP-AQ, IBBI, DEBITS, PASMU, LIA-ARSAIO etc .. and regional decision makers. The WG is currently planning 

-       To evaluate African-specific emission inventories.

-       To consider specific emissions in Africa, for each sector from regional to city spatial resolution.

-       To create a regional database including local informations on fuel activity and consumption, emission factors and emission inventories. This database will deal with sources for present, historical and future emissions including mitigation scenario.

-       To develop a continental wide African emission inventory, with the most recent DACCIWA inventory as a baseline and local informations. 

-       To organize training sessions on emissions in Africa


GEIA Related Overarching Activities

Historic Emissions Development for Chemistry-Climate Models

International science team that focuses on the development of historic emissions datasets for chemistry-climate modeling efforts, including the Chemistry-Climate Modeling InitiativeCoupled Model Intercomparison Project, and the Intergovernmental Panel on Climate Change Assessment Reports. GEIA Steering Committee Members: Claire Granier, Jean-François Lamarque, Hugo Denier van der Gon, Gregory Frost, Greet Janssens-Maenhout, Johannes Kaiser, Terry Keating, Cathy Liousse, Paulette Middleton, Toshimasa Ohara, Martin Schultz, Leonor Tarrasón


GEIA Collaborations

Interdisciplinary Biomass Burning Initiative (IBBI)

The Interdisciplinary Biomass Burning Initiative is a set of coordinated international activities organized by IGAC, iLEAPS, and WMO that will help better quantify the present and future impact of biomass burning emissions on the composition and chemistry of the Earth’s atmosphere. Chairs: Johannes Kaiser, Melita Keywood; GEIA Steering Committee Members: Johannes Kaiser, Claire Granier

National/Regional/Global Collaborations

GEIA maintains strong connections and engages in active discussions with national, regional, and global government agencies, research institutions, and corporations developing emissions information around the world.

European Commission Joint Research Center (JRC) - GEIA Steering Committee Member: Greet Janssens-Maenhout

Institute of Ecology, Mexico (INE) - GEIA Steering Committee Member: Beatriz Cardenas

International Institute for Applied Systems Analysis, Austria (IIASA) - GEIA Steering Committee Member: Zbigniew Klimont

National Institute for Environmental Studies, Japan (NIES) - GEIA Steering Committee Member: Toshimasa Ohara

TNO, The Netherlands - GEIA Steering Committee Member: Hugo Denier van der Gon

US Environmental Protection Agency (USEPA) - GEIA Steering Committee Member: Terry Keating

World Meteorological Organization (WMO) - GEIA Steering Committee Member: Alexander Baklanov