A heuristic approach to defining the structure parameter of the refractive index of atmosphere from the turbulent lidar data
I.A. Razenkov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: atmospheric turbulence, backscatter enhancement effect, turbulent lidar
Abstract
It is shown that the approximate Vorobyov formula linking the lidar returns with the intensity of optical turbulence, for the case of a statistically homogeneous medium with an accuracy up to a constant coefficient, satisfactorily agrees with the sounding data. The procedure for determining the coefficient in the Vorobyov formula for a specific lidar aperture size is recommended. The construction of a nomogram for the operational determination of the intensity of homogeneous turbulence from lidar readings is proposed. The discrepancy between the experimental results and the theory when sounding inhomogeneous turbulence is established. It is shown that the main contribution to the formation of the turbulent component of a lidar return due to the BSE effect is made by the section of the path in front of the scattering volume. It is proposed to use an approximate formula to restore the structure parameter of the optical turbulence Cn2, in which normalized Cn2 is directly proportional to the return and inversely proportional to the integral determining the dispersion of intensity fluctuations.
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