References

AMTD

Atmospheric Measurement Techniques Discussions

AMTD

Atmos. Meas. Tech. Discuss.

1867-8610

Göttingen, Germany

10.5194/amtd-4-6577-2011

Monitoring of inorganic ions, carbonaceous matter and mass in ambient aerosol particles with online and offline methods

Timonen

¹ Aurela

¹ Saarnio

¹ Frey

¹ Saarikoski

¹ Teinilä

¹ Kulmala

² Hillamo

Air Quality Research, Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland

Department of Physics, University of Helsinki, P.O. Box 64, 00014 University of Helsinki, Finland

28 10 2011

4 5 6577 6614

2011

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://amt.copernicus.org/preprints/4/6577/2011/amtd-4-6577-2011.html

The full text article is available as a PDF file from https://amt.copernicus.org/preprints/4/6577/2011/amtd-4-6577-2011.pdf

Year-long high timeresolution measurements of major chemical components in atmospheric sub-micrometer particles were conducted at an urban background station in Finland 2006–2007. Ions were analyzed using a particle-into-liquid sampler combined with an ion chromatograph (PILS-IC), organic and elemental carbon (OC and EC) by using a semicontinuos OC/EC aerosol carbon analyzer (RT-OCEC), and PM2.5 mass with a tapered element oscillating microbalance (TEOM). Long time series provides information on differences between the used measurement techniques as well as information about the diurnal and seasonal changes. Chemical mass closure was constructed by comparing the identified aerosol mass with the measured PM2.5. The sum of all components measured online (ions, particulate organic matter (POM), EC) represented only 65% of the total PM2.5 mass. The difference can be explained by the difference in cutoff sizes (PM1 for online measurements, PM2.5 for total mass) and by evaporation of the semivolatile/volatile components. In general, some differences in results were observed when the results of the continuous/semicontinuous instruments were compared with those of the conventional filter samplings. For non-volatile compounds, like sulfate and potassium, correlation between the filter samples and the PILS was good but greater differences were observed for the semivolatile compounds like nitrate and ammonium. For OC the results of the RT-OCEC were on average 10% larger than those of the filters. When compared to filter measurements, high resolution measurements provide important data on short pollution plumes as well as on diurnal changes. Clear seasonal and diurnal cycles were observed for nitrate and EC.

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