Development of a Chemical Transport Model Coupled with a Mesoscale Meteorological Model and Application to Atmospheric Diffusion of Volcanic Gases from Miyake Island.

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  • NISHIZAWA Masato
    Department of Environmental Sciences, Japan Atomic Energy Research Institute
  • CHINO Masamichi
    Department of Environmental Sciences, Japan Atomic Energy Research Institute

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  • メソスケール気象モデルと結合した大気化学物質輸送モデルの開発と三宅島火山ガスの大気拡散への適用
  • メソスケール キショウ モデル ト ケツゴウ シタ タイキ カガク ブッシツ ユソウ モデル ノ カイハツ ト ミヤケジマ カザン ガス ノ タイキ カクサン エ ノ テキヨウ

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Abstract

In order to simulate the behavior of atmospheric chemical species in detail, a three-dimensional chemical transport model coupled with a mesoscale meteorological model was developed and applied to the atmospheric diffusion of volcanic gases from Miyake Island. PSU/NCAR MM5 was used to calculate meteorological field, and the processes for atmospheric chemical species, e.g., advection, eddy diffusion, chemical reaction, and deposition, were added to MM5.<BR>In this paper, the relationship between the behavior of volcanic gases and meteorological Conditions and the effect of volcanic gases on concentration of SO2 in the Kanto, Chubu, and Kansai Districts were investigated during the period of August and September 2000.<BR>The comparison of simulated results with observations showed that the model reproduced a suitable meteorological field, increased surface concentration of SO2 due to volcanic gases, and wet deposition of sulfate. The simulation indicated that cyclones, typhoons, fronts, and traveling anticyclones around Japan played an important role in advecting volcanic gases to Honshu, the main island of Japan. Volcanic gases covered most of the calculation domain and increased the monthly average concentration of SO2.

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