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    Original Research Papers

    Tropospheric carbon dioxide concentrations at a northern boreal site in Finland: basic variations and source areas

    Authors:

    T. Aalto ,

    Finnish Meteorological Institute, Air Quality Research, FI
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    J. Hatakka,

    Finnish Meteorological Institute, Air Quality Research, FI
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    J. Paatero,

    Finnish Meteorological Institute, Air Quality Research, FI
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    J.-P. Tuovinen,

    Finnish Meteorological Institute, Air Quality Research, FI
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    M. Aurela,

    Finnish Meteorological Institute, Air Quality Research, FI
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    T. Laurila,

    Finnish Meteorological Institute, Air Quality Research, FI
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    K. Holmén,

    Department of Meteorology, Arrhenius Laboratory, Stockholm University, SE
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    N. Trivett,

    Retired, earlier in Air Quality Measurements and Analysis Research Division, Atmospheric Environment Service, Environment Canada, CA
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    Y. Viisanen

    Finnish Meteorological Institute, Air Quality Research, FI
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    Abstract

    Diurnal and annual variations of CO2, O3, SO2, black carbon and condensation nuclei and their source areas were studied by utilizing air parcel trajectories and tropospheric concentration measurements at a boreal GAW site in Pallas, Finland. The average growth trend of CO2 was about 2.5 ppm yr−1 according to a 4-yr measurement period starting in October 1996. The annual cycle of CO2 showed concentration difference of about 19 ppm between the summer minimum and winter maximum. The diurnal cycle was most pronounced during July and August. The variation between daily minimum and maximum was about 5 ppm. There was a diurnal cycle in aerosol concentrations during spring and summer. Diurnal variation in ozone concentrations was weak. According to trajectory analysis the site was equally affected by continental and marine air masses. During summer the contribution of continental air increased, although the southernmost influences decreased. During daytime in summer the source areas of CO2 were mainly located in the northern parts of the Central Europe, while during winter the sources were more evenly distributed. Ozone showed similar source areas during summer, while during winter, unlike CO2, high concentrations were observed in air arriving from the sea. Sulfur dioxide sources were more northern (Kola peninsula and further east) and CO2 sources west-weighted in comparison to sources of black carbon. Source areas of black carbon were similar to source areas of aerosols during winter. Aerosol source area distributions showed signs of marine sources during spring and summer.

    How to Cite: Aalto, T., Hatakka, J., Paatero, J., Tuovinen, J.-P., Aurela, M., Laurila, T., Holmén, K., Trivett, N. and Viisanen, Y., 2002. Tropospheric carbon dioxide concentrations at a northern boreal site in Finland: basic variations and source areas. Tellus B: Chemical and Physical Meteorology, 54(2), pp.110–126. DOI: http://doi.org/10.3402/tellusb.v54i2.16652
      Published on 01 Jan 2002
    Peer Reviewed
     CC BY 4.0
     Accepted on 17 Dec 2001            Submitted on 12 Mar 2001

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