Estimation of \begin{document}${\boldsymbol{C_n^2}}$\end{document} profile of troposphere over the sea

Abstract

The problem of turbulence has been puzzling relevant researchers for more than 300 years. Although some feasible solutions and models have been proposed, the turbulence still brings trouble in the foreseeable future. Turbulence is caused mainly by buoyant thermal bubbles and wind shear, which transports matter and energy between the earth surface and the atmosphere. Based on the analysis of the measured data obtained from the Sea Monsoon Experiment-II (SMEX-II), carried out on the ‘Shenkuo’ scientific research ship, the vertical spatial distribution of meteorological data overseas was explored when the air sounding balloons were released at relatively fixed times during June 2019. Through the Tatarski model, the main influencing factors of fitting turbulence profile over the sea and the turbulence evolution of boundary layer top and tropopause are discussed. Meanwhile, the effect of offshore distance of the scientific research ship on the vertical profile of optical turbulence strength is analyzed. The results show that the outer scale plays a decisive role in the distribution of turbulence over the seas. The inverse growth section between the boundary layer top and the tropopause depends on the sudden change of temperature gradient. The underlying land surface has a significant influence on the inverse growth section to the boundary layer top, while the underlying sea surface has a more pronounced influence on the inverse growth section of the tropopause. Based on the obtained data and corresponding analysis, the spatiotemporal distribution characteristics of optical turbulence overseas are grasped, which provides necessary references for selecting the astronomical observation sites, atmospheric laser transmission, and satellite remote sensing observations over the sea.