Modeling the diurnal dependence of the optical refractive index structure parameter

A model which simulates the diurnal dependence of the optical refractive index structure parameter within the atmospheric boundary layer is constructed by solving an energy balance equation for the ground surface temperature. This solution yields surface fluxes of sensible and latent heat. Empirical relationships are then used to calculate Cn2. Model results compare favorably with data obtained at a desert location under clear skies. A sensitivity analysis indicates that Cn2 is particularly sensitive to time of year, wind speed, the product of soil heat capacity and soil density, and soil moisture content. This model is applicable over relatively flat surfaces with little or no vegetation.

[1]  D. L. Walters,et al.  Atmospheric modulation transfer function for desert and mountain locations: the atmospheric effects on r 0 , 1981 .

[2]  J. Kaimal,et al.  Turbulence Structure in the Convective Boundary Layer , 1976 .

[3]  M. L. Wesely,et al.  Diurnal cycles of the refractive index structure function coefficient , 1973 .

[4]  John C. Wyngaard,et al.  Turbulence in the Evolving Stable Boundary Layer , 1979 .

[5]  A. Chamberlain.  Transport of gases to and from surfaces with bluff and wave‐like roughness elements , 1968 .

[6]  M. Wesely,et al.  The Combined Effect of Temperature and Humidity Fluctuations on Refractive Index , 1976 .

[7]  K. I. Kondratʹev.  Radiation in the atmosphere , 1969 .

[8]  The Diurnal Variation of Mixing Height by Season over White Sands Missile Range, New Mexico , 1976 .

[9]  B. Hicks,et al.  Momentum, heat and water vapour transfer to and from natural and artificial surfaces , 1973 .

[10]  G. R. Ochs,et al.  A saturation-resistant optical scintillometer to measure Cn2† , 1978 .

[11]  A. Blackadar,et al.  High resolution models of the planetary boundary layer , 1979 .

[12]  C. Bhumralkar.  Numerical Experiments on the Computation of Ground Surface Temperature in an Atmospheric General Circulation Model , 1975 .

[13]  Kenneth E. Kunkel,et al.  Behavior of the Temperature Structure Parameter in a Desert Basin , 1981 .

[14]  J. Deardorff.  Efficient prediction of ground surface temperature and moisture, with inclusion of a layer of vegetation , 1978 .

[15]  J. Wyngaard,et al.  A Model Study of the Stably Stratified Planetary Boundary Layer , 1978 .

[16]  D. O. Staley,et al.  Effective Atmospheric Emissivity under Clear Skies , 1972 .

[17]  K. Kunkel,et al.  Intermittent turbulence in measurements of the temperature structure parameter under very stable conditions , 1982 .