Articles | Volume 8, issue 12
Atmos. Meas. Tech., 8, 5063–5087, 2015
Atmos. Meas. Tech., 8, 5063–5087, 2015

Research article 02 Dec 2015

Research article | 02 Dec 2015

ACTRIS ACSM intercomparison – Part 1: Reproducibility of concentration and fragment results from 13 individual Quadrupole Aerosol Chemical Speciation Monitors (Q-ACSM) and consistency with co-located instruments

V. Crenn1, J. Sciare1,2, P. L. Croteau3, S. Verlhac4, R. Fröhlich5, C. A. Belis6, W. Aas7, M. Äijälä8, A. Alastuey9, B. Artiñano10, D. Baisnée1, N. Bonnaire1, M. Bressi6, M. Canagaratna3, F. Canonaco5, C. Carbone11, F. Cavalli6, E. Coz10, M. J. Cubison12, J. K. Esser-Gietl13, D. C. Green14, V. Gros1, L. Heikkinen8, H. Herrmann15, C. Lunder7, M. C. Minguillón9, G. Močnik16, C. D. O'Dowd17, J. Ovadnevaite17, J.-E. Petit1,4, E. Petralia18, L. Poulain15, M. Priestman14, V. Riffault19, A. Ripoll9, R. Sarda-Estève1, J. G. Slowik6, A. Setyan19, A. Wiedensohler15, U. Baltensperger5, A. S. H. Prévôt5, J. T. Jayne3, and O. Favez4 V. Crenn et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, LSCE, CNRS-CEA-UVSQ, Gif-sur-Yvette, France
  • 2The Cyprus Institute, Environment Energy and Water Research Center, Nicosia, Cyprus
  • 3Aerodyne Research, Inc., Billerica, Massachusetts, USA
  • 4INERIS, Verneuil-en-Halatte, France
  • 5Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen PSI, Switzerland
  • 6European Commission, Joint Research Centre (JRC), Institute for Environment and Sustainability (IES), Air and Climate Unit, Ispra (VA), Italy
  • 7NILU – Norwegian Institute for Air Research, Kjeller, Norway
  • 8Department of Physics, University of Helsinki, Helsinki, Finland
  • 9Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
  • 10Centre for Energy, Environment and Technology Research (CIEMAT), Department of the Environment, Madrid, Spain
  • 11Proambiente S.c.r.l., CNR Research Area, Bologna, Italy
  • 12TOFWERK AG, Thun, Switzerland
  • 13Deutscher Wetterdienst, Meteorologisches Observatorium Hohenpeißenberg, Hohenpeißenberg, Germany
  • 14Environmental Research Group, MRC-HPA Centre for Environment and Health, King's College London, London, UK
  • 15Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 16Aerosol d.o.o., Ljubljana, Slovenia
  • 17School of Physics and Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland
  • 18ENEA-National Agency for New Technologies, Energy and Sustainable Economic Development, Bologna, Italy
  • 19Ecole Nationale Supérieure des Mines de Douai, Département Sciences de l'Atmosphère et Génie de l'Environnement, Douai, France

Abstract. As part of the European ACTRIS project, the first large Quadrupole Aerosol Chemical Speciation Monitor (Q-ACSM) intercomparison study was conducted in the region of Paris for 3 weeks during the late-fall – early-winter period (November–December 2013). The first week was dedicated to the tuning and calibration of each instrument, whereas the second and third were dedicated to side-by-side comparison in ambient conditions with co-located instruments providing independent information on submicron aerosol optical, physical, and chemical properties. Near real-time measurements of the major chemical species (organic matter, sulfate, nitrate, ammonium, and chloride) in the non-refractory submicron aerosols (NR-PM1) were obtained here from 13 Q-ACSM. The results show that these instruments can produce highly comparable and robust measurements of the NR-PM1 total mass and its major components. Taking the median of the 13 Q-ACSM as a reference for this study, strong correlations (r2 > 0.9) were observed systematically for each individual Q-ACSM across all chemical families except for chloride for which three Q-ACSMs showing weak correlations partly due to the very low concentrations during the study. Reproducibility expanded uncertainties of Q-ACSM concentration measurements were determined using appropriate methodologies defined by the International Standard Organization (ISO 17025, 1999) and were found to be 9, 15, 19, 28, and 36 % for NR-PM1, nitrate, organic matter, sulfate, and ammonium, respectively. However, discrepancies were observed in the relative concentrations of the constituent mass fragments for each chemical component. In particular, significant differences were observed for the organic fragment at mass-to-charge ratio 44, which is a key parameter describing the oxidation state of organic aerosol. Following this first major intercomparison exercise of a large number of Q-ACSMs, detailed intercomparison results are presented, along with a discussion of some recommendations about best calibration practices, standardized data processing, and data treatment.

Short summary
A large intercomparison study of 13 Q-ACSM was conducted for a 3-week period in the region of Paris to evaluate the performance of this instrument and to monitor the major NR-PM1 chemical components. Reproducibility expanded uncertainties of Q-ACSM concentration measurements were found to be 9, 15, 19, 28, and 36% for NR-PM1, NO3, OM, SO4, and NH4, respectively. Some recommendations regarding best calibration practices, standardized data processing and data treatment are also provided.