1. Stefan Reimann, Empa, Switzerland Ground-based Networks for Measuring Ozone- and Climate-Related Trace Gases Cape Matatula, Am. Samoa Cape Grim, Tasmania Jungfraujoch, Switzerland

2.  Ground-based Continuous Networks  Column measurements: NDACC  In-situ measurements: NOAA (ESRL)/AGAGE  Results from Ground-based Continuous Networks  CFCs/chlorinated solvents: abundance and emissions  CCl 4 : sources and sinks: an update  “new” CFCs  HCFCs/HFCs: abundance and emissions  climate impact of CFCs/HCFCs/HFCs and new replacement compounds Overview

3.  Ground-based Continuous Networks  Column measurements: NDACC  In-situ measurements: NOAA (ESRL)/AGAGE  Results from Ground-based Continuous Networks  CFCs/chlorinated solvents: abundance and emissions  CCl 4 : sources and sinks: an update  “new” CFCs  HCFCs/HFCs: abundance and emissions  climate impact of CFCs/HCFCs/HFCs and new replacement compounds Overview

4. Network for the Detection of Atmospheric Composition Change (NDACC ) FTIR network

5. Results of NDACC Provided by E. Mahieu, University of Liège

6. in-situ Measurements NOAA (ESRL)/AGAGE NOAA/ESRL Halocarbon Surface and Aircraft Sampling Network AGAGE Continuous Halocarbon in-situ Sampling Network

7. Results of ground-based in-situ networks for CFCs and chlorinated solvents  Global emission: 12-box model Concentrations

8. Results of ground-based in-situ networks for CFCs and chlorinated solvents Emissions

9.  Ground-based Continuous Networks  Column measurements: NDACC  In-situ measurements: NOAA (ESRL)/AGAGE  Results from Ground-based Continuous Networks  CFCs/chlorinated solvents: abundance and emissions  CCl 4 : sources and sinks: an update  “new” CFCs  HCFCs/HFCs: abundance and emissions  climate impact of CFCs/HCFCs/HFCs and new replacement compounds Overview

10. NOAA AGAGE Emissions with Lifetime = 26 yr Results of ground-based in-situ networks for Carbon Tetrachloride (CCl 4 ) issue Emissions derived from measurements

11. Potential Emissions = Production – Feedstock Emissions derived from UNEP reporting Results of ground-based in-situ networks for Carbon Tetrachloride (CCl 4 ) issue

12. Possible reasons for the discrepancy: 1.Emissions from production/feedstock/destruction? 2.Emissions from old industrial sites/landfills? 3.Estimated atmospheric lifetime (26 yr) too small? Possible reasons for the discrepancy: 1.Emissions from production/feedstock/destruction? 2.Emissions from old industrial sites/landfills? 3.Estimated atmospheric lifetime (26 yr) too small? UNEP emissions 1600 railway freight cars emitted per year Emissions (T=26 yr) Results of ground-based in-situ networks for Carbon Tetrachloride (CCl 4 ) issue

13.  Ground-based Continuous Networks  Column measurements: NDACC  In-situ measurements: NOAA (ESRL)/AGAGE  Results from Ground-based Continuous Networks  CFCs/chlorinated solvents: abundance and emissions  CCl 4 : sources and sinks: an update  “new” CFCs  HCFCs/HFCs: abundance and emissions  climate impact of CFCs/HCFCs/HFCs and new replacement compounds Overview

14. Laube et al., Nature Geoscience, 2014 Results of ground-based in-situ networks “New” ozone-depleting susbtances chlorofluorocarbon: CFC-112

15. Laube et al., Nature Geoscience, 2014 Results of ground-based in-situ networks “New” ozone-depleting susbtances chlorofluorocarbon: CFC-113a Concentrations: very low, partly increasing Emissions: low, partly increasing Concentrations: very low, partly increasing Emissions: low, partly increasing “New” ODSs :

16.  Ground-based Continuous Networks  Column measurements: NDACC  In-situ measurements: NOAA (ESRL)/AGAGE  Results from Ground-based Continuous Networks  CFCs/chlorinated solvents: abundance and emissions  CCl 4 : sources and sinks: an update  “new” CFCs  HCFCs/HFCs: abundance and emissions  climate impact of CFCs/HCFCs/HFCs and new replacement compounds Overview

17. Results of ground-based in-situ networks for ozone-depleting substances Concentrations Emissions Concentrations: still increasing Emissions: total ~stable HFCF-141b reincreasing? Concentrations: still increasing Emissions: total ~stable HFCF-141b reincreasing? HCFCs:

18. Results of ground-based in-situ networks Hydrofluorocarbons (HFCs) Concentrations Emissions Concentrations: increasing Emissions: increasing Concentrations: increasing Emissions: increasing HFCs:

19.  Ground-based Continuous Networks  Column measurements: NDACC  In-situ measurements: NOAA (ESRL)/AGAGE  Results from Ground-based Continuous Networks  CFCs/chlorinated solvents: abundance and emissions  CCl 4 : sources and sinks: an update  “new” CFCs  HCFCs/HFCs: abundance and emissions  climate impact of CFCs/HCFCs/HFCs and new replacement compounds Overview

20. Emissions as CO 2 -Equivalents: Ozone-depleting substances and HFCs

21. Emissions as CO 2 -Equivalents: Ozone-depleting substances and HFCs

22. Proposal to amend the Montreal Protocol to include HFCs http://ozone.unep.org/Meeting_Documents/mop/22mop/MOP-22-5E.pdf

23. Long-lived ozone-depleting substances (ODSs) are mainly behaving as expected CCl 4 sources estimated from measurements are higher than reconciled by inventories New ODSs have been detected in the atmosphere, but their influence on stratospheric ozone is still negligible HFCs as replacement compounds are increasing and CO2 equivalent emissions are similar to CFCs and HCFCs Continuous measurements of ozone-depleting substances are needed to check trends and compliance with international Protocols Conclusions

24. Contributions from: NOAA(ESRL) AGAGE Bradley Hall (NOAA) Emmanuel Mahieu (Uni. Liège) Johannes Laube (UEA) Thank you for your attention!