1. 1 Towards an improved European Infrastructure for reactive trace gas monitoring within ACTRIS Christian Plass-Duelmer, Stefan Reimann, S. Gilge, A. Werner, C. Hoerger, the ACTRIS Team

2. 2 WP4: Trace gases networking: Volatile organic carbon and nitrogen oxides WMO/GAW WCC / QA-SAC CCL EMEP Data Quality Objective Meas. Guidelines Qualtity Assurance Data Reporting Integration/Harmonization Funding ACTRIS-VOC/NOx Activities AMOHA FP5 project

3. 3 ACTRIS NA4 Community Work shop Ispra, Oct 2011, Work shop Hohenpeißenberg, June 2012 Several bi-lateral meetings Reactive Gases Development of concepts, drafts, dissemination, revisions in ACTRIS-GAW Community GAW VOC Expert Group, York, Sep 2012 WMO/GAW Meeting, Geneva, Feb 2013 ACTRIS-EMEP Community EBAS Data workshop, Oslo, May 2012 EMEP TFMM, May 2011, May 2013 ACTRIS-AQUILA Community Cooperation in method development, Participate in RR and intercomparisons

4. 4

5. 5 How do stations measure? Status Stations – Measurement Techniques and QA/QC See www.actris.net wp4Documents/StationQuestionnaireswww.actris.net VOCNOx Air InletXX SamplingX PreconcentrationX InstrumentXX Operation, Maintenance XX Data acq. And processingXX QA/QC, documentationXX Data submissionXX Sketch of systemXX ChromatogramsX

6. 6 Draft Measurement Guidelines See www.actris.net wp4Documents Rational and objectives Data Quality Objectives measurement set-up and sampling measurement instruments calibration QA and QC data evaluation uncertainty data submission DQO of ACTRIS and GAW What are the recommendations? How can the stations improve? VOC NOx

7. 7 ACTRIS Round Robin Experiments Two Legs - ACTRIS 1 /2 NO: synthetic mixture ppm in N2 How good are the calibration standards at the stations? NO, relative deviation from NPL reference value

8. 8 VOC-round robin: 1ppb NMHC in N2 (expand. combined uncertainty, k=2) isoprene

9. 9 Deviation < ACTRIS DQO Deviation < GAW DQO Dev. GAW DQO Dev. > uncertainty, > GAW DQO VOC-round robin: 1ppb NMHC in N2 (Numbers = % deviations, green < ACTRIS DQO)

10. 10 What is the quality of ambient measurements? VOC whole air intercomparison during round robin experiment

11. 11 Deviations from Reference values for one station (orange: VOC in N2, green: VOC in air) FID-C-Response as diagnostic tool (blue: lab-standard, red: ACTRIS VOC in N2) Lab-Stand

12. 12 14 NO/NO2 instruments sampling from a common manifold at Hohenpeissenberg, Nov, 12.-16., 2012 10x CLD with PLC/BLC or Mo converters, 1x LIF, 1x DOAS, 1x CAPS, 1x CRD initial calibration at the beginning of SBS via manifold zero gas, synthetic mixtures, ambient air, and spiked ambient air

13. 13 Time-series ambient

14. 14 Feed-Back-Plots

15. 15 Performance of patricipating instruments in air: <20% of data outside DQO, >50% of data outside DQO

16. 16 round robin VOC + monoterpenes + side-by-side NOx – stations got feed-back and questions - waiting for station answers learn about superior techniques, problematic techniques – input for Measurement Guidelines and QA, distribute in community, improve upcoming OVOC intercomparison with GC-MS/FID and PTR-MS instruments at Hohenpeissenberg in October papers on RR and comparisons-results next version Draft Measurement Guidelines – ACTRIS + GAW community – Cross-link with IAGOS, PEGASOS, iLeaps, AQUILA - finalize in GAW Reports station audits EBAS data reporting feed-back (data evaluations) Acknowledgement The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 262254. Improve quality, disseminate knowledge, Increase data availability expand network