  Characterization of atmospheric turbulence is essential to understanding
image quality of astronomical telescopes and applying adaptive optics systems.
In this study, the vertical distributions of optical turbulence at the Peak
Terskol Observatory (43.27472N 42.50083E, 3127 m a.s.l.) using the Era-5
re-analysis, scintillation measurements and sonic anemometer data are
investigated. For the reanalysis grid node closest to the observatory, vertical
profiles of the structural constant of the air refractive index turbulent
fluctuations $C^2_n$ were obtained. The calculated $C^2_n(z)$ vertical profiles
are compared with the vertical distribution of turbulence intensity obtained
from tomographic measurements with Shack-Hartmann sensor. The Fried parameter
r0 at the location of Terskol Peak Observatory was estimated. Using combination
of atmospheric models and scheme paramaterization of turbulence, $C^2_n(z)$
profiles at Mt. Kurapdag were obtained. The r0 values at the Peak Terskol
Observatory are compared with estimated values of this length at the ten
astronomical sites including Ali, Lenghu and Daocheng.
