Evidence for long‐term changes in base cations in the atmospheric aerosol

Strontium isotope composition as a tracer of calcium sources in two forest ecosystems in Belgium

“…In other respects, a decrease in the basic cations concentration from atmospheric depositions to ecosystems has been observed in Europe and North America (Wesselink et al, 1995;Likens et al, 1998;Lee et al, 1998). Our results support therefore the conclusion of Hedin et al (1994) which suggest that the atmospheric base cation trends are ecologically relevant on the scale of decades for nutrient-poor ecosystems.…”

Atmospheric deposition of inorganic and organic nitrogen and base cations in Hawaii

“…The atmosphere also becomes an increasingly important source of the base cations, potassium (K + ), calcium (Ca 2+ ), and magnesium (Mg 2+ ), through time [ Chadwick et al , 1999]. While recent research on base cation deposition has focused on their important role in neutralizing acid deposition [ Hedin et al , 1994; Larssen and Carmichael , 2000; Lee et al , 1998], base cations are also important plant nutrients. On young islands, there is a high availability of cations in the soil because of high concentrations present in the relatively unweathered rock substrate.…”

Precipitation chemistry in Croatia during the period 1981–2006

“…The results presented above have shown the major significant decreasing trends for concentrations of all main ions in precipitation. Previous studies 72,[75][76][77] related the decline in atmospheric base cations (Na + , Ca 2+ , K + , Mg 2+ ) with the decline of sulfate ion and decline of emissions of SO 2 . Emission of sulfur pollutants and base cations could originate from the same source.…”