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Trajectory-based source area analysis of atmospheric fine particles, SO2, NOx and O3 for the SMEAR II station in Finland in 1996–2008

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Author(s): M. Hulkkonen | L. Riuttanen | M. Dal Maso | H. Junninen | M. Kulmala

Journal: Atmospheric Chemistry and Physics Discussions
ISSN 1680-7367

Volume: 12;
Issue: 1;
Start page: 1653;
Date: 2012;
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ABSTRACT
Source area analysis based on combining in situ measurements of trace gas or particle concentrations and back trajectories calculated for corresponding times has proven to be a valuable approach in atmospheric research; especially in investigating air pollution episodes, but also in e.g. tracing the source areas of air masses related to high vs. low concentrations of aerosol particles of different sizes at the receptor site. A statistical trajectory method used before by Sogacheva et al. (2005) was fine-tuned to take the presumable horizontal error in calculated trajectories into account, tested with SO2 and validated by comparison against EMEP (European Monitoring and Evaluation Programme) emission data. In this work we apply the improved method for characterizing the source areas of atmospheric SO2, NOx, O3 and aerosol particles of different size modes from the perspective of a Finnish measurement station located in Hyytiälä (61°51' N, 24°17' E). Our method proved useful for qualitative source area analysis of measured trace compounds. We applied it to study trends and seasonal variation in atmospheric pollutant transport during 13 yr at the SMEAR II station.

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