Accession Number : ADA018374

Title :   Development of a Low-Level Atmospheric Turbulence Model for Marine Environments.

Descriptive Note : Final rept. 4 Sep 74-4 Sep 75,


Personal Author(s) : Lewellen,W. S. ; Teske,M. E.

Report Date : SEP 1975

Pagination or Media Count : 63

Abstract : Second-order closure modeling of turbulence is used to develop a program for computing the marine atmospheric boundary layer. Detailed low-level distributions of mean velocity, temperature, humidity, and the second-order correlations of the turbulent fluctuations of these variables, are computed numerically from a set of partial differential equations for these variables. Moisture is permitted in both gaseous and liquid form with the change of phase assumed to follow equilibrium, Clasius-Clapeyron conditions. Comparison with laboratory data and qualitative comparison with field observations tend to verify the program's predictions. The predictions for humidity and temperature, along with their fluctuations, are used to predict the index of refraction and the refractive-index-structure parameter. Several sample calculations are made. These include calculations using (a) output from the hemispherical model of Fleet Numerical Weather Central, (b) boundary conditions corresponding to the Atlantic Tradewinds, and (c) conditions simulating steady shoreline situations for different combinations of land and water temperature.

Descriptors :   *Atmosphere models, *Weather forecasting, Turbulence, Atmospheric motion, Marine climatology, Atmospheric temperature, Humidity, Partial differential equations, Air water interactions, Mathematical models

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE