1. Paul Scherrer Institut
A.S.H. Prévôt, F. Canonaco, J.G. Slowik, U. Baltensperger
AMS measurements during the EMEP campaign and the ACTRIS year
Thanks to BAFU, Empa for financial support and collaboration

2. Content
Introduction
Aerosol chemical speciation monitor (ACSM) versus Aerosol mass spectrometer
First results
STATUS OF AMS PLANNING DURING EMEP/ACTRIS
page 2 2

3. Aerosol mass spectrometer

4. Composition and organic components in the northern hemisphere
HOA: mostly fossil combustion like traffic
OOA: mostly secondary
Other OA: e.g. wood burning, cooking
Data are based on campaigns of 3-5 weeks
Jimenez, Prevot et al., Science, 2009

5. Campaign Averages: Absolute composition of NR-PM1
Nemitz et al., in prep.
(* Data not yet available)

6. The ACSM instrument - Scheme
Particle Beam Generation
Particle Sizing
HR-TOF
Chopper
Particle Composition
Quadrupole Mass Spectrometer
Thermal Vaporization &
Electron Ionization
Internal standard
Aerodynamic Lens nm
Particle Inlet (1 atm)
Pumps
page 6 6

7. Example of comparison of time trends ACSM/AMS
sulfate
organics

8. Longer tests to estimate the decay of the detector system
ACSM was not measuring, problem with the inlet

9. winter
spring
summer

10. EMEP campaigns – ACTRIS ACSM year
EMEP campaign Summer June 8 – July
EMEP campaign Winter January 15-February (still tentative)
ACTRIS ACSM year : June 2012 – May 2013 (prolonged on voluntary basis)
10-11 May 2012: Preparatory meeting for the ACSM users at PSI, Switzerland

11. ACTRIS year + EMEP campaign
Official ACTRIS
Will be operational later, probably in autumn

12. EMEP - ACTRIS
For the measurements of aerosol chemical composition and the assessment of OM sources/components for longer time periods, ACSM seems to be a very good tool
The combination of the ACSM with the multi-wavelength light absorption meas is recommendable to provide source apportionment of BC as well
In the future PM2.5 instead of PM1 will be possible
Value of monthly campaigns enhanced if embedded in one-year long ACSM measurements
Analyses will include comparison to off-line measurements, gasphase measurements, trajectory analyses, model evaluations… and, and, and

13. HOPEFULLY MORE ACSMs ACROSS EUROPE
Later Future
HOPEFULLY MORE ACSMs ACROSS EUROPE
GOAL: SET UP REGULAR MEETINGS AND EVALUATION OF ACSM DATA IN A EUROPEAN CONTEXT OVER THE NEXT DECADE
Possible Extension of AMS analyses to stations without ACSM in the future:
Offline analyses are possible with the AMS (It is worth to freeze filters (best quartz filters) because they could be analyzed afterwards by AMS)