标题：Temporal trends in the bulk deposition and atmospheric concentration of acidifying compounds and trace elements in the Finnish Integrated Monitoring catchment Valkea-Kotinen during 1988–2011
摘要：The precipitation chemistry of nearly 30 acidifying compounds, base cations and several trace elements was monitored in the Valkea-Kotinen catchment in southern Finland during 1988–2011. Measurements of the atmospheric concentration of SO2, NO2 and O3 covered a shorter period. Temporal trends in the components are presented. A notable finding was an indication of a possible increase in the bulk deposition of Cd and NO3 –. The effect of the changing nitrate deposition on the hydrological continuum of groundwater is also briefly discussed. The transport of air masses to the Valkea-Kotinen catchment was estimated and binds all the results presented in this issue to the development in the emission patterns in Europe.
