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Report No.

Modeling fog chemistry and its deposition on a mountain forest in summer in Japan

Kajino, Mizuo*; Katata, Genki; Hiraki, Takatoshi*; Aikawa, Masahide*; Kobayashi, Tomiki*; Ueda, Hiromasa*

We numerically evaluated depositional pathways of major air pollutants such as SO$$_{4}^{2-}$$, NH$$_{4}^{+}$$, NO$$_{3}^{-}$$, Cl$$^{-}$$, and Na$$^{+}$$ over mountain forest areas in Mt. Rokko in July 1999. A modified WRF model including fog deposition (fog-WRF) and Regional Air Quality Model 2 (RAQM2) was used for simulations. To show the consistency of the model performance, the measured chemical components in fog water were compared with the modeled concentrations. During the simulation period, the persistent southerly wind carried humid air from the Osaka Bay to Mt. Rokko and caused condensation along mountain ridges higher than 400 m in altitude during nights. Simulation results showed that fog deposition was dominant for all depositional components, while dry deposition of nitrate was large due to the high deposition velocity of HNO$$_{3}$$ gas.



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