|Abstract||On-line measurements of atmospheric VOC concentrations in the European boreal zone with a proton transfer reaction mass spectrometer were conducted at SMEAR II station in Hyytiala, south-western Finland on 2–22 July 2004. The measurements showed a strong diurnal variation of several compounds. A factor analysis performed for the concentration data was used to classify the measured VOC masses into three classes based on the behavior of their concentrations. The masses in the first class had a high diurnal variation with maximum values in the afternoon. Compounds contributing to masses in this category were e.g. methanol, acetone, methyl-vinyl-ketone and hexanal. The concentrations of masses in the second class had also a high diurnal variation, but with maxima during the night when the mixing of the atmospheric surface layer was weak. Monoterpenes and phenol are compounds contributing to the masses in this category. The masses in the third class did not have a marked diurnal cycle and were not dependent on the local meteorological parameters. The masses having a strong positive loading on this factor were those associated with anthropogenic compounds with relatively long atmospheric life-times, such as benzene. Considering the difference in the measurement height, the total monoterpene concentration measured by the PTR-MS was consistent with the concentration measured by gas chromatography-mass spectrometer with adsorbent sampling.|
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|Name||Affiliation||Home page||Total pubs|
|Hakola H||Finnish Meteorological Institute, Air Quality Research, Sahaajankatu 20 E, FIN-00880 Helsinki, Finland||9|
|Kulmala M||Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland||70|
|Reissell A||Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland||6|
|Rinne J||Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland||9|
|Ruuskanen TM||University of Helsinki, Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland||4|
|Taipale R||Department of Physical Sciences, P.O. Box 64, FI-00014 University of Helsinki, Finland||3|
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