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Offline Chemical Transport Model: Oslo CTM2 Weather Forecast Study

Explore how Oslo CTM2 offline chemical transport model utilizes forecast data from ECMWF for detailed production of mineral dust based on friction velocities and vegetation thresholds. Calculations include optical properties using Mie theory with AERONET data.

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Offline Chemical Transport Model: Oslo CTM2 Weather Forecast Study

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  1. Model description • Oslo CTM2 is an offline chemical transport model and in this study we use forecast data from the European Center forMedium-Range Weather forecast (ECMWF) with 1.875x1.875 degrees horizontalresolution and with 40 levels in the vertical with a resolution of about 600meters in most of the troposphere. • Production of mineral dust is based on the formula • Production = const · u*2 (u*-u*tr), • u* - friction velocity, u*tr – threshold friction velocity • The threshold friction velocity depends on vegetation and several global vegetation datasets have been used • 8 size bins are used in the model calculations • Optical properties calculated using Mie theory (refractive indices from AERONET)

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