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Report No.

Aerosol deposition and behavior on leaves in cool-temperate deciduous forests, 2; Characteristics of fog water chemistry and fog deposition in northern Japan, in 2010

Yamaguchi, Takashi*; Noguchi, Izumi*; Watanabe, Yoko*; Katata, Genki; Sato, Haruna*; Hara, Hiroshi*

Fog water chemistry was measured and the fog water deposition rate was estimated by a throughfall method at Lake Mashu, northern Japan, from May to November, 2010. NH$$_{4}$$$$^{+}$$ and SO$$_{4}$$$$^{2-}$$ were the most abundant cation and anion, respectively. The fog water pH ranged from 4.2 to 6.4 (mean value: 5.1). The [NH$$_{4}$$$$^{+}$$]/[SO$$_{4}$$$$^{2-}$$] equivalent ratio in fog water was more than 1.0 throughout the measuring period, indicating that NH$$_{4}$$$$^{+}$$ was the major factor in the neutralization of fog water. The estimated fog water deposition rate and fog water deposition were 0.11$$pm$$0.22 mm h$$^{-1}$$ and 117.0 mm, respectively. The estimated seasonal deposition of nitrogen in fog water, 26.1 meq m$$^{-1}$$, was considerable amount compared to that of reported nitrogen deposition in rainfall.



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