Measurement of fog deposition by the throughfall method and ion deposition amounts from fog and rain at Lake Mashu
2015
Yamaguchi, T. | Noguchi, I.
We evaluated the concentration in fogwater and deposition amounts of air pollutants from June to September in 2013 at Lake Mashu, in eastern Hokkaido, northern Japan. Concentrations of major ions derived from air pollutants were higher in fog water than in rainwater. The concentration of ammonium ion (NH4sup(+)) in fog water was 126.7 micro eq /L, which was 8.5 times larger than the concentration in rainwater. The deposition amount of rain water was 462mm, while the deposition amount of fogwater, measured by the throughfall method, was 122mm, or 26% of rainwater deposition. Nitrogen deposition (NH4sup(+) + NO3sup(-)) by fog was estimated at 21.7 meq /square m (NH4sup(+):17.5 meq /square m, NO3sup(-):4.2 meq /square m) and was double of that of rain, which was 11.5 meq /square m (NH4sup(+):7.0 meq /square m, NO3sup(-):4.5 meq /square m). The results indicate that the nitrogen deposition by fog deposition could be a main nitrogen source for trees in mountainous areas.
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