Trends In The Base Cation Deposition In Finland
Author(s)
T. Ruoho-Airola & K. Salminen
Abstract
The deposition of the base cations is an important element in determining the total
deposited acidity in the critical loads approach used in the protocols of the
Convention on Long-range Transboundary Air Pollution. In Finland, where the
mineral content and the weathering rate of the soils are low, the atmospheric
deposition forms a significant source for base cations.
The concentration of the base cations, especially calcium, in both wet and dry
deposition has declined widely in Finland since 1985. The southern parts of the
country also receive less potassium and magnesium in precipitation than a decade
ago. Particulate concentration measurements show a downward trend for calcium,
magnesium and sodium in the southeast and for calcium and potassium in the far
north. The observed reduction of non-sea-salt base cations is supposed partly to be
the result of
Keywords
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