Direct evaluation of refractive-index structure functions from large-eddy simulation output for atmospheric convective boundary layers

• Autorzy: Wilson C. , Fedorovich E.
• Języki publikacji: EN

Abstrakty

EN

Fluctuations of the refractive index associated with atmospheric turbulence affect the propagation of electromagnetic and acoustic waves in the atmosphere. In the reported study, the effects of turbulence on wave propagation in the atmospheric convective boundary layer (CBL) are considered in terms of the second-order refractive index structure function and related to its structure-function parameter C2n . Two structure-function evaluation methods are compared. The direct evaluation method involves calculating the refractive index at each point in the simulation domain with subsequent calculation of the structure function. The second method is based on a parameterized linear relationship between the refractive-index structure function and temperature/humidity structure functions. For each evaluation method, vertical profiles of C2n computed for separations along the three coordinate directions collapse together over a significant portion of the CBL. Near-surface divergence of C2n values along the horizontal directions was noted and attributed to the influence of surface wind shear on the turbulent fluctuations of temperature and humidity. The behavior of C2n near the surface was shown to agree favorably with similarity-theory predictions.

Słowa kluczowe

EN

turbulence; boundary layer; refractive index; structure function; numerical simulation

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2012
• Tom: Vol. 60, no. 5
• Strony: 1474--1492
• Opis fizyczny: Bibliogr. 25 poz.

Twórcy

autor

Wilson C.

autor

Fedorovich E.

• School of Meteorology, University of Oklahoma, Norman, OK, USA,

Bibliografia

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