The SAG Aerosol Urs Baltensperger

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1 The SAG Aerosol Urs Baltensperger Laboratory of Atmospheric Chemistry Paul Scherrer Institut, CH-5232 Villigen PSI Web site: (Host: IfT Leipzig) GAW2005 Workshop WMO, March 2005

2 Objective for the GAW Aerosol Programme To determine the spatiotemporal distribution of aerosol properties related to climate forcing and air quality up to multidecadal time scales

3 Aerosol recommended by the SAG Aerosol (in bold: core parameters) Continuously: - Multiwavelength optical depth - Mass in two size fractions - Major chemical components in two size fractions - Light absorption coefficient - Light scattering coefficient at various wavelengths - Scattering and hemispheric backscattering coefficient - Aerosol number concentration - Cloud condensation nuclei at 0.5% supersaturation - Diffuse, global and direct solar radiation Intermittently: - Aerosol size distribution - Detailed size fractionated chemical composition - Dependence on relative humidity - CCN spectra (various supersaturations) - Vertical distribution of aerosol properties

4 The guidelines for aerosol measurements (WMO/GAW Report No. 153 (2003) can be downloaded from the WMO website at

5 World Calibration Centres for Aerosol Too many parameters for one centre World calibration centre for physical aerosol properties (WCCAP): Alfred Wiedensohler, IfT Leipzig, see separate contribution on Tuesday World calibration centre for chemical aerosol properties: N.N., see contribution by Volker Mohnen on Tuesday

6 Next tasks SOPs for those parameters where agreed procedures are available For some parameters more research is required before a recommended procedure can be provided, e.g. absorption coefficient, with numerous intercomparison workshops in the US and Europe 4.0E-6 3.0E-6 y = x + 2E-08 R 2 = E-6 3.0E-6 y = x + 4E-08 R 2 = AETH [m-1] 2.0E-6 PSAP [m-1] 2.0E-6 1.0E-6 1.0E-6 0.0E+0 0.0E+0 1.0E-6 2.0E-6 3.0E-6 4.0E-6 0.0E+0 0.0E+0 1.0E-6 2.0E-6 3.0E-6 4.0E-6 MAAP [m-1] MAAP [m-1]

7 The GAW PFR Network Bold:operational; Grey: planned; italic: related

8 Major challenges To improve spatial coverage and completeness of aerosol measurements - funding - capacity building NOAA establishing aerosol sampling system at Cape Point and Mt Waliguan, sponsored by US State Department EC proposal for enhancement of aerosol parameters at 20 European stations submitted aerosol courses by WCCAP in conjunction with GAWTEC audits at various Global GAW sites next SAG meeting in Asia (Xining) To improve the discipline of data submission make data submission as simple as possible

9 CMDL/NOAA Basic Aerosol Sampling System MFC+ Pump Neph Inlet flow 150 lpm = 5*30 lpm at splitter System footprint is 0.9 x 0.6 m. PSAP Lead: John Ogren, NOAA PM1 CPC PM10 Drier Splitter RH Nephelometer PSAP CPC A/D, PID, PC switched impactors Inlet Heater Costs: ~110 k$

10 Issues on data submission The problem: Data submission often requested by more than data centre Different data formats Risk of non-identical data sets The solution (as agreed between EMEP and SAG Aerosol) Data are submitted to EMEP data centre (NILU, Norway) in NASA Ames 1001 from where data are converted into NARSTO DES and mirrored to the WDCA in Ispra, Italy EMEP: Co-operative programme for monitoring and evaluation of the long-range transmissions of air pollutants in Europe under the Convention on Long-Range Transboundary Air Pollution

11 The World Data Centre for Aerosols Hosted by JRC Ispra, Italy See See separate contribution by Julian Wilson on Tuesday

12 Summary Report on Recommendations published WCCAP established WCCAC still searched Data agreement between GAW and NILU (EMEP) may serve as model between other data centres SAG working on - better coverage of aerosol measurements -SOPs - research for some aerosol parameters - information on vertical distribution - capacity building - contribution to IGACO

13 The SAG members: Urs Baltensperger (chair) Len Barrie Jens Bösenberg John Gras Gerry Jennings Ray Hoff Shao-Meng Li John Ogren Chris Wehrli Ali Wiedensohler Julian Wilson Xiao-Ye Zhang Thank you for your attention