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The Empirical Model of Aerosol Uplifting from the Arid Area

Gorchakov, G.I., Shukurov, K.A., and Golitsyn, G.S., A.M. Obukhov Institute of Atmospheric Physics, RAS
Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting

The model enables to make the estimates of the vertical fluxes of arid aerosol using measured data of the wind velocity. The model includes the following main elements: 1. The parameterization of the microstructure of the aerosol uplifted from the area. 2. Relationship between wind velocity and the submicron aerosol concentration. 3. The aerosol uplifting rates. It is found that there is the synchronism of the submicron and coarse aerosol fluctuation in convective conditions at the arid area. Vertical turbulent fluxes of the aerosol were determined regarding two regimes of aerosol fluctuations observed in September 1998: the lift by dust devils and by regular convection. The new approximation was proposed regarding to particle size distribution function of the aerosol generated at the surface in the size range from 0.4 to 7.0 mcm. The statistical relationship between mass concentration of the submicron aerosol and the wind velocity was found. The estimates of the aerosol fluxes depending on both particle size and wind velocity were obtained. The model can be used for estimates of the radiative effects of the mineral aerosol.

Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).