Further Developments of the A. R. A. P. Model for the Atmospheric Marine Environment

Abstract : This report presents further developments of A.R.A.P.'s model for computing the detailed low-level atmospheric distribution of velocity, temperature, moisture, refractive index, and the turbulent variations of these quantities. A number of simulations of possible fog scenarios have been run and compared with Calspan data. The detailed evolution of wave turbulent interactions in the inversion which caps the mixed layer has been analyzed with a view towards simpler parameterization of this phenomenon. The model has been extended in two quite separate areas: (1) to exhibit the role of turbulent agglomeration in cloud microphysics; and (2) to examine the conditions under which the turbulent macroscale becomes highly anisotropic and to provide a relatively simple means for incorporating this effect into our turbulent transport model whenever necessary. Preliminary analysis is given to argue that the A.R.A.P. model can be used as the basis of parameterization of the influence of sub-grid turbulent fluxes in mesoscale meteorological models.