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| Titel |
Intercomparison of an Aerosol Chemical Speciation Monitor (ACSM) with ambient fine aerosol measurements in downtown Atlanta, Georgia |
| VerfasserIn |
S. H. Budisulistiorini, M. R. Canagaratna, P. L. Croteau, K. Baumann, E. S. Edgerton, M. S. Kollman, N. L. Ng, V. Verma, S. L. Shaw, E. M. Knipping, D. R. Worsnop, J. T. Jayne, R. J. Weber, J. D. Surratt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 7 ; Nr. 7, no. 7 (2014-07-02), S.1929-1941 |
| Datensatznummer |
250115834
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| Publikation (Nr.) |
 copernicus.org/amt-7-1929-2014.pdf |
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| Zusammenfassung |
| Currently, there are a limited number of field studies that evaluate the
long-term performance of the Aerodyne Aerosol Chemical Speciation Monitor
(ACSM) against established monitoring networks. In this study, we present
seasonal intercomparisons of the ACSM with collocated fine aerosol
(PM2.5) measurements at the Southeastern Aerosol Research and
Characterization (SEARCH) Jefferson Street (JST) site near downtown Atlanta,
GA, during 2011–2012. Intercomparison of two collocated ACSMs resulted in
strong correlations (r2 > 0.8) for all chemical species,
except chloride (r2 = 0.21) indicating that ACSM instruments are
capable of stable and reproducible operation. In general, speciated ACSM mass
concentrations correlate well (r2 > 0.7) with the
filter-adjusted continuous measurements from JST, although the correlation
for nitrate is weaker (r2 = 0.55) in summer. Correlations of the ACSM
NR-PM1 (non-refractory particulate matter with aerodynamic diameter
less than or equal to 1 μm) plus elemental carbon (EC) with tapered element oscillating microbalance (TEOM) PM2.5 and Federal Reference Method (FRM) PM1 mass are strong
with r2 > 0.7 and r2 > 0.8,
respectively. Discrepancies might be attributed to evaporative losses of
semi-volatile species from the filter measurements used to adjust the
collocated continuous measurements. This suggests that adjusting the ambient
aerosol continuous measurements with results from filter analysis introduced
additional bias to the measurements. We also recommend to calibrate the
ambient aerosol monitoring instruments using aerosol standards rather than
gas-phase standards. The fitting approach for ACSM relative ionization for
sulfate was shown to improve the comparisons between ACSM and collocated
measurements in the absence of calibrated values, suggesting the importance of
adding sulfate calibration into the ACSM calibration routine. |
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