Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
The SAG AerosolUrs Baltensperger
Laboratory of Atmospheric ChemistryPaul Scherrer Institut, CH-5232 Villigen PSI
Web site: http://gaw.tropos.de:8087/ (Host: IfT Leipzig)
GAW2005 WorkshopWMO, 14-16 March 2005
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
Objective for the GAW Aerosol Programme
To determine the spatio-temporal distribution of aerosol properties related to climate forcing and air quality up to multidecadaltime scales
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
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
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
The guidelines for aerosol measurements(WMO/GAW Report No. 153 (2003)
can be downloaded from the WMO website at
http://netra1.wmo.ch/web/arep/gaw/publications.html
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
World Calibration Centres for Aerosol
• Too many parameters for one centre• World calibration centre for physical aerosol
properties (WCCAP): Alfred Wiedensohler, IfTLeipzig, see separate contribution on Tuesday
• World calibration centre for chemical aerosolproperties: N.N., see contribution by Volker Mohnen on Tuesday
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
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. absorptioncoefficient, with numerous intercomparison workshops in theUS and Europe
y = 1.1803x + 2E-08R2 = 0.9115
0.0E+0
1.0E-6
2.0E-6
3.0E-6
4.0E-6
0.0E+0 1.0E-6 2.0E-6 3.0E-6 4.0E-6
MAAP [m-1]
AET
H [m
-1]
y = 0.8973x + 4E-08R2 = 0.8673
0.0E+0
1.0E-6
2.0E-6
3.0E-6
4.0E-6
0.0E+0 1.0E-6 2.0E-6 3.0E-6 4.0E-6
MAAP [m-1]
PSA
P [m
-1]
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
The GAW PFR Network
Bold:operational; Grey: planned; italic: related
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
Major challenges
• To improve spatial coverage and completeness of aerosol measurements- funding- capacity building
NOAA establishing aerosol sampling system at Cape Pointand Mt Waliguan, sponsored by US State DepartmentEC proposal for enhancement of aerosol parameters at 20 European stations submittedaerosol courses by WCCAP in conjunction with GAWTECaudits at various Global GAW sitesnext SAG meeting in Asia (Xining)
• To improve the discipline of data submissionmake data submission as simple as possible
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
Splitter
CMDL/NOAA Basic Aerosol Sampling System
MFC+Pump
PM1
PM10
Drier
Neph
PSAP
CPC
Inlet Heater
RH
Inlet flow 150 lpm = 5*30 lpm at splitter
System footprint is 0.9 x 0.6 m.
switched impactors
A/D, PID, PC
PSAP
CPC
Nep
helo
met
er
Costs: ~110 k$
Lead: John Ogren, NOAA
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
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 intoNARSTO 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
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
The World Data Centre for Aerosols
• Hosted by JRC Ispra, Italy• See http://rea.ei.jrc.it/netshare/wilson/WDCA/• See separate contribution by Julian Wilson
on Tuesday
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
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
Paul Scherrer Institut • 5232 Villigen PSI
P A U L S C H E R R E R I N S T I T U T
Thank you for your attention
The SAG members:Urs Baltensperger (chair)Len BarrieJens BösenbergJohn GrasGerry JenningsRay HoffShao-Meng LiJohn OgrenChris WehrliAli WiedensohlerJulian WilsonXiao-Ye Zhang
http://gaw.tropos.de:8087
