1. An Integrated Global Atmospheric Chemistry Observations Strategy IGACO & WMO GAW and GEOSS Hennie Kelder Professor University of Technology of Eindhoven

2. What Is IGOS? A Consortium of 13 Partners Formed in 1999 with a secretariat that rotates lead every 2 years. They meet regularily with CEOS The IGOS Partners include the: Global observing systems  Global Climate Observing System (GCOS)  Global Ocean Observing System (GOOS)  Global Observing System (GOS) of the WMO  Global Atmospheric Watch(GAW) of the WMO  Global Terrestrial Observing System (GTOS) Sponsors of the global observing systems  World Meteorological Organization (WMO)  U.N. Educational, Scientific, and Cultural Organization (UNESCO)  U.N. Environment Programme (UNEP)  Intergovernmental Oceanographic Organization (IOC)  International Council for Science (ICSU)  Food and Agriculture Organization (FAO) Committee on Earth Observation Satellites( CEOS) includes all national and regional government agencies with an Earth observing satellite system Global change research programs  International Geosphere-Biosphere Programme (IGBP)  World Climate Research Programme (WCRP)  International Group of Funding Agencies for Global Change Research (IGFA)

3. Integrated Global Observing Strategy (IGOS) Partnership Themes Ocean Global Carbon Cycle (IGCO) Global Water Cycle (IGWCO) Geo-Hazards Atmospheric Chemistry (IGACO) Coastal (incl. Coral-Reef) Land ……

4. Objectives: 1.To ensure accurate, comprehensive global observations of key atmospheric gases and aerosols; 2.To establish a system for integrating ground-based, in situ and satellite observations using atmospheric models; 3.To make the integrated observations accessible to users. An international process: Panel of 19 experts from 12 countries and independent reviewers from 7 countries. Integrated Global Atmospheric Chemistry Observation (IGACO) System Satellite Observations Aircraft Ground-based IGACO System Links to: Space agencies, WCRP, GCOS, IGBP, IGOS themes Lbarrie@wmo.int Joerg.Langen@esa.int An IGOS theme implemented by WMO NO 2 Products

5. Chemical species Air Quality Oxidation Capacity Climate Stratospheric Ozone Depletion O3O3 H 2 O (water vapour) CO CO 2 CH 4 HCHO VOCs N2ON2O NO x = NO+NO 2 HNO 3 SO 2 BrO, ClO, OClO HCl, ClONO 2 CH 3 Br, CF 3 Br, CFC- 11, CFC-12, HCFC- 22 aerosol optical properties actinic flux IGACO TARGET VARIABLE LIST

6. The Role Of The World Meteorological Organization (WMO)  As the lead agency designated by IGOS to implement IGACO, WMO shall use its unique international experience, programmes and partnerships to build a generally accepted global plan and to promote implementation through bottom-up research efforts at the national and regional level.  IGACO builds on GAW, other WMO programmes and partnerships. It bridges surface-based, aircraft and satellite observations to the weather forecast and modelling research community.

7. WMO GAW: What is it?  The Global Atmosphere Watch programme of WMO  Established in 1989 by merging the Global Ozone Observing System (GO 3 OS) and Background Monitoring of Air Pollution (BAPMoN) programmes  Coordinated by the Environment Division of WMO’s Atmospheric Research and Environment Programme (AREP) department under the Commission for Atmospheric Science (CAS) and its Working Group on Environmental Pollution and Atmospheric Chemistry.

8. The GAW Mission  Systematic Global Monitoring Of Chemical Composition of the Atmosphere.  Analysis and Assessment in Support of International Conventions.  Development Of Air Pollution and Climate Predictive Capability

9. WMO GAW Monitoring Components SCIENTIFIC ADVISORY GROUPS: AEROSOL OZONE GHGs PRECIP-CHEM UV REACTIVE GASES QUALITY ASSURANCE- SCIENCE ACTIVITY CENTRES WCCs, RCCs, Projects CENTRAL CALIBRATION LABORATORIES (World Reference Standard) GAW STATIONS & GAWSIS Global Regional GAW WORLD DATA CENTRES: OZONE/UV GHGs(& Related Gases) AEROSOL PRECIP-CHEM RADIATION Analysis Twinning Workshops Calibration, Training Site Visits, Comparisons Synthesis IGACO Contributing Networks Satellite Observations CAS/WG Environmental Pollution And Atmospheric Chemistry(EPAC) WMO/GAW Secretariat AREP

10. Geo summit Cape Town, November 2007 accepted WMO

11. Recommendations from IGACO, WMO GAW, GEO Summit Short term Planning and initiation of a coordinated satellite system compromising both LEO and GEO instruments complemented by non-satellite measurement network for air quality and climate Beyond 2014 Provide an operational network of the appropriate combination of LEO and GEO satellites with adequate coverage and time resolution TROPOMI is fully in line with the recommendations of IGACO, WMO and GEOSS to be implemented as LEO component and as a precursor for sentinel 5 for atmospheric chemistry