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|Title:||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|
|Authors:||CRENN Vincent; SCIARE Jean; CROTEAU P. L.; VERLHAC S.; FRÖHLICH Roman; BELIS CLAUDIO; AAS W.; AIJÄLÄ Mikko; ALASTUEY Andres; ARTIÑANO Begoña; BAISNÉE D.; BONNAIRE Nicolas; BRESSI MICHAEL; CANAGARATNA M. R.; CANONACO Francesco; CARBONE Claudio; CAVALLI Fabrizia; COZ Esther; CUBISON Michael J.; ESSER-GIETL J. K.; GREEN D. C.; GROS V.; HEIKKINEN L.; HERRMANN Helmut; LUNDER C. R.; MINGUILLÓN M. C.; MOCNIK Grisa; O'DOWD Colin; OVADNEVAITE J.; PETIT J. -E.; PETRALIA E.; POULAIN L.; PRIESTMAN M.; RIFFAULT V.; RIPOLL A.; SARDA-ESTÈVE R.; SLOWIK Jay; SETYAN Ari; WIEDENSOHLER Alfred; BALTENSPERGER Urs; PREVOT Andre S. H.; JAYNE J. T.; FAVEZ Olivier|
|Citation:||ATMOSPHERIC MEASUREMENT TECHNIQUES vol. 8 no. 12 p. 5063-5087|
|Publisher:||COPERNICUS GESELLSCHAFT MBH|
|Type:||Articles in periodicals and books|
|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.|
|JRC Directorate:||Sustainable Resources|
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