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| Titel |
Long-term volatility measurements of submicron atmospheric aerosol in Hyytiälä, Finland |
| VerfasserIn |
S. A. K. Häkkinen, M. Äijälä, K. Lehtipalo, H. Junninen, J. Backman, A. Virkkula, T. Nieminen, M. Vestenius, H. Hakola, M. Ehn, D. R. Worsnop, M. Kulmala  , T. Petäjä, I. Riipinen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 22 ; Nr. 12, no. 22 (2012-11-16), S.10771-10786 |
| Datensatznummer |
250011597
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| Publikation (Nr.) |
 copernicus.org/acp-12-10771-2012.pdf |
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| Zusammenfassung |
| The volatility of submicron atmospheric aerosol particles was investigated
at a boreal forest site in Hyytiälä, Finland from January 2008 to May 2010. These long-term observations allowed for studying the seasonal
behavior of aerosol evaporation with a special focus on compounds that
remained in the aerosol phase at 280 °C. The
temperature-response of evaporation was also studied by heating the aerosol
sample step-wise to six temperatures ranging from 80 °C to
280 °C. The mass fraction remaining after heating (MFR) was
determined from the measured particle number size distributions before and
after heating assuming a constant particle density (1.6 g cm−3). On
average 19% of the total aerosol mass remained in the particulate phase
at 280 °C. The particles evaporated less at low ambient
temperatures during winter as compared with the warmer months. Black carbon
(BC) fraction of aerosol mass correlated positively with the MFR at 280 °C, but could not explain it completely: most of the time a
notable fraction of this non-volatile residual was something other than BC.
Using additional information on ambient meteorological conditions and
results from an Aerodyne aerosol mass spectrometer (AMS), the chemical
composition of MFR at 280 °C and its seasonal behavior was
further examined. Correlation analysis with ambient temperature and mass
fractions of polycyclic aromatic hydrocarbons (PAHs) indicated that MFR at 280 °C is probably affected by anthropogenic emissions. On the
other hand, results from the AMS analysis suggested that there may be very
low-volatile organics, possibly organonitrates, in the non-volatile (at 280 °C) fraction of aerosol mass. |
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