2. ATMOSPHERIC CHEMISTRY APPLICATIONS WORKSHOP 20-21 January 2004, ESTEC Albert P H Goede Objective of the Workshop User Consultation on present and future needs for atmosphere chemistry observations Definition of Integrated Global Observation System, notably the satellite component

3. Atmospheric Chemistry Applications Climate ChangeChemistry-climate interactions, UTLS, atmospheric composition & trends, IPCC assessments Montreal and Kyoto Protocol Monitoring and Verification stratospheric ozone, surface UV, GHG emissions, Policy support Troposphere Cleansing power of atmosphere/trend Chemistry free troposphere Air Pollution CLRTAP (Convention Long-Range Transport), EC directives on air quality, Policy support Forecastsozone layer and surface UV chemical weather, improvement of NWP aviation management

4. User input required on all 5 issues listed User Needs and requirements (example, long term record total ozone, regional forecast air pollution etc, specify region/spatial resolution/temporal resolution/ averages, list of data products.) User Segment (example, regional environmental agency, weather service, climate change agency etc) Policy foundation (example, Kyoto, CLRTAP etc) Science review (what are the underlying science issues, what do we know, what is still uncertain, ) Strategy for Integrated Observation System (What infra structure is there on ground, in space and how to improve or fill gaps. What can be achieved in 2, 5, 10 years time and how to go about.)

5. Working Group Composition WG 1Air Quality Monitoring (chair Boucher/rapporteur Monks) ETCACC RIVM+NILU, ADEME, ITC, EMPA, EPA, GMES- Daedalus, CERMES WG 2 Montreal, Kyoto Protocol Monitoring (ch Barrie, rap Raes) WMO, NILU, GMES-GATO, JRC-IES, RIVM-UV WG 3 Climate Chemistry (chair van Weele, rapporteur Kerridge) DLR-IAP, KNMI, JRC, KfA Julich, SPARC, research groups WG 4 Tropospheric Chemistry (chair Bovensmann, rap Krol) MPI-Hamburg, U Heidelberg, IGBP-IGAC, ACCENT, LISA, other research groups WG 5 Forecasting (chair Peuch, rapporteur Fishman) Meteo-France, DWD, DMI, KNMI, INERIS, LISA, VITO

6. Application Areas Global Oxidizing Capacity (mainly OH) Global tropospheric O3 trends Global long range transport of pollutants

7. Policy And Science foundation Scientists Policy makers Observed Change, e.g. in tropospheric O3 Causes for the change Action taken (reduce emissions) Differentiate requirements between Trend monitoring Analysis of the underlying Processes (Causes?)

8. Policy and Science foundation (II) Global Tropospheric O3 Kyoto (Greenhouse Gas) Air quality (Constrain for the BL O3) Oxidizing Capacity / Power / Efficiency Kyoto (methane growth rate) Post Montreal (HCFCs concentrations) Global LRT CLRTAP

9. User Needs Global Tropospheric O3 trends Climate Impacts (UTLS) Horizontal Scale: 100 km…….20 km Vertical Scale: 1km …….100m Temporal ….. 3 days……3 hourly Air Quality (PBL/FT) Horizontal Scale: 50 km…….10 km Vertical Scale: FT/PBL ……1km Temporal ….. 6 hours (fronts)… hourly Assimilation: less stringent constraints GLOBAL COVERAGE Over Decades (> 2 solar cycles)

10. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-9 Analysis of Causes : Need additional data Deposition Strat/Trop Exchange Photolysis Rates + Temperature Hydrocarbons (VOC, natural) (Not in IGACO)! CO CH4 H2O NOx (NO + NO2!) CH2O PAN…

11. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-10 Oxidizing Capacity Trend in OH Globally <1% Regionally <5% Integrated quantity (e.g. weighted with CH4 removal) Indirect Methods like methyl Chloroform, IGAC-GHOST Direct: via H2O, O3, NOx, CH4, CO, …..+model p.m. BrO, NO3, ….

12. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-11 Oxidizing Capacity Analysis of Causes: Why is OH changing ---> process level Production: O3, NO + NO2, H2O2, ROOH, photolysis, Temperature, H2O Loss: CO, CH4, Hydrocarbons, CH2O, O3, NO2, … Related HO2, CH3O2, Relevant Scales…..(IGACO)

13. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-12 Oxidizing Capacity (cont…) Modelling is needed: Emissions (NOx, Biomass Burning) Surface Albedo, J-values, Aerosols, …

14. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-13 Long Range Transport CO, NOx/NOy, O3, POPs, Hg Scales: Horizontal Scale: 50 km…….10 km Vertical Scale: FT/PBL/UTLS ……1km Temporal ….. daily 6 hours (fronts)

15. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-14 Integrated Observing System Satellites can not provide everything: Models Inverse modelling / data assimilation Surface Observations/ Aircrafts, Balloons Process Studies, Campaigns

16. Atmospheric Chemistry Applications Workshop ESTEC 20-21 January 2004-15 Integrated Observing System (strategy) Models Biosphere Emissions J-values Biomass Burning Satellites Aircraft Surface Measurements Assimilation /Inv. Modelling Lightning

17. User Segment

18. Strategy