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Discussion papers
https://doi.org/10.5194/acp-2019-703
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-703
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Aug 2019

Submitted as: research article | 12 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Aerosol dynamics and gas-particle conversion in dry deposition of inorganic reactive nitrogen in a temperate forest

Genki Katata1, Kazuhide Matsuda2, Atsuyuki Sorimachi3, Mizuo Kajino4, and Kentaro Takagi5 Genki Katata et al.
  • 1Institute for Global Change Adaptation Science (ICAS), Ibaraki University, Ibaraki, 310-8512, Japan
  • 2Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
  • 3Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikarigaoka, Fukushima, Fukushima 960-1295, Japan
  • 4Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Ibaraki 305-0052, Japan
  • 5Teshio experimental forest, Field Science Center for Northern Biosphere. Hokkaido University, Toikanbetsu, Horonobe, Hokkaido 098-2943, Japan

Abstract. Although dry deposition has an impact on nitrogen status in the forest environments, the mechanism for high dry deposition rates of fine nitrate aerosols (NO3-) observed in forests remains unknown and is a potential source of error in chemical transport models. Here we developed a new multi-layer land surface model coupled with dry deposition and aerosol dynamics processes for a temperate mixed forest in Japan. The processes of thermodynamics, kinetics, and dry deposition for mixed inorganic aerosols are modeled by a triple-moment modal method. The new model overall reproduces observed turbulent fluxes above the canopy and vertical micrometeorological profiles, as well as inorganic mass and size-resolved total number concentrations within the canopy. Sensitivity tests revealed that the within-canopy evaporation of ammonium nitrate (NH4NO3) under dry conditions significantly enhances deposition flux for fine NO3- and NH4+ aerosols, while reducing deposition flux for nitric acid gas (HNO3). A dry deposition scheme coupled with aerosol dynamics may be required to improve the predictive accuracy of chemical transport models for the surface concentration of inorganic reactive nitrogen.

Genki Katata et al.
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Short summary
This work quantified the role of aerosol dynamics and gas-particle conversion processes in dry deposition of inorganic reactive nitrogen using a new multi-layer land surface model. It was also revealed that a potential impact of the above processes to improve the predictive accuracy of chemical transport models.
This work quantified the role of aerosol dynamics and gas-particle conversion processes in dry...
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