long-term volatility measurements of submicron atmospheric aerosol in hyytiälä, finland
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ID: 135578
2012
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Abstract
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<sup>−3</sup>). 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.
| Reference Key |
hkkinen2012atmosphericlong-term
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|---|---|
| Authors | ;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 |
| Journal | Journal of agricultural and food chemistry |
| Year | 2012 |
| DOI |
10.5194/acp-12-10771-2012
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| URL | |
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