Retrieval of structure functions of air temperature and refractive index from large eddy simulations of the atmospheric boundary layer

Chris Wilson; Alexander M.J van Eijk; Evgeni Fedorovich

doi:10.1117/12.2023990

25 September 2013 Retrieval of structure functions of air temperature and refractive index from large eddy simulations of the atmospheric boundary layer

Chris Wilson, Alexander M.J van Eijk, Evgeni Fedorovich

Author Affiliations +

Proceedings Volume 8874, Laser Communication and Propagation through the Atmosphere and Oceans II; 887408 (2013) https://doi.org/10.1117/12.2023990
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

A methodology is presented to infer the refractive-index structure function parameter and the structure parameters for temperature and humidity from numerical simulations of the turbulent atmospheric convective boundary layer (CBL). The method employs spatial and temporal averaging of multiple realizations of the CBL flow field reproduced by a large-eddy simulation (LES) of the atmosphere. The C_n² values yielded by LES-based approach agree fairly well with C_n² values predicted by the Monin-Obukhov similarity theory. In this respect, the C_n² retrieval from the LES data is promising for evaluating the vertical profile of C_n² throughout the entire CBL. Under the considered CBL conditions and for the selected optical wavelength of 0.55 μm the value of C_n² was found to be dominated by the C_T² contribution in the first few hundred meters above the surface, whereas the C_Tq contribution became significant aloft.

Citation Download Citation

Chris Wilson, Alexander M.J van Eijk, and Evgeni Fedorovich "Retrieval of structure functions of air temperature and refractive index from large eddy simulations of the atmospheric boundary layer", Proc. SPIE 8874, Laser Communication and Propagation through the Atmosphere and Oceans II, 887408 (25 September 2013); https://doi.org/10.1117/12.2023990

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