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Atmospheric and Oceanic Optics

2021 year, number 3

1.
Comparison of profile models for water vapor absorption lines

T.M. Petrova, A.M. Solodov, A.P. Shcherbakov, V.M. Deichuli, A.A. Solodov, Yu.N. Ponomarev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: absorption line profile, water molecule, Fourier spectrometry

Abstract >>
The absorption spectra of a water molecule perturbed by argon pressure were measured in the 6700-7650 cm-1 region. The spectra were recorded at an IFS 125HR Fourier spectrometer with a high signal-to-noise ratio at a room temperature with a spectral resolution of 0.01 cm-1. The argon pressure was varied from 0 to 0.9 atm. Using three models of the line profile (the traditional Voigt profile, the quadratic Voigt profile depending on the velocity of the absorbing molecule, and the Hartmann-Tran profile), the parameters of the absorption lines of the water molecule were obtained. It is shown that the use of the HTP profile gives better agreement with the experimental data. For mass measurements at pressures above 300 mbar, it is suggested to use a relatively simple Voigt profile which depends on the velocity of the absorbing molecule.



2.
Absorption coefficient and intermolecular vibrations in the СО-Ar system

O.B. Rodimova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: fundamental CO band wing, the He broadening, spectral line wings, second virial coefficient, potential energy surface

Abstract >>
Absorption in the 1-0 band of CO broadened by Ar is examined using the asymptotic line wing theory. An expression for the line shape is derived within the asymptotic line-wing theory (ALWT) when the center of mass motion is considered as classical whereas the other variables remain quantum. The line shape parameters are fitted to reach agreement between calculated and experimental data on the absorption in the CO band wing. The classical potential parameters are found from the temperature dependence of the second virial coefficient. A qualitative agreement is found between the quantum potential parameters and intermolecular potential surfaces from quantum-chemical calculations.



3.
Determination of the height of the turbulent mixing air layer based on estimation of the parameters of wind turbulence from lidar data

V.A. Banakh, I.N. Smalikho, A.V. Falits
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: spectral line wings, second virial coefficient, potential energy surface

Abstract >>
A method is suggested for retrieving the diurnal variation in the height of turbulent mixing layer based on the height-temporal distributions of the dissipation rate of turbulent kinetic energy and variance of radial velocity obtained from measurements with a conically scanning coherent Doppler lidar. The accuracy of determining the mixing layer height by the method suggested is analyzed.



4.
Compensation for aberration distortions of a laser beam wavefront by aero-optical effects on aircraft - satellite paths based on backscatter signals

A.A. Sukharev, V.A. Banakh
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: aero-optical effects, aberrations, atmospheric backscatter

Abstract >>
We present the results of a numerical study of the possibility of compensating for aero-optical aberration distortions of the beam wavefront by the method of aperture sensing based on the atmospheric backscatter signal. It is shown that the method makes it possible to partially compensate for aero-optical aberrations. The dimensions of a beam in the cross section become several times smaller than of a beam without adaptive control of the wavefront, and the intensity distribution becomes more symmetric about the optical axis.



5.
Development of the empirical model of optical characteristics of aerosol in Western Siberia

P.N. Zenkova, S.A. Terpugova, V.V. Pol'kin, Vas.V. Pol'kin, V.N. Uzhegov, V.S. Kozlov, E.P. Yausheva, M.V. Panchenko
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: aerosol, empirical model, scattering, absorption, extinction

Abstract >>
A scheme of the new stage of the development of a generalized empirical model of optical characteristics of tropospheric aerosol in Western Siberia is described. An algorithm is suggested for accounting the particle size distribution function of absorbing matter and the condensation activity of aerosols. Optical characteristics have been calculated with the complex refractive index of particles of different sizes variable with the relative air humidity. Using the “haze” type of the “aerosol weather” as an example, the results of model calculation are compared with the average experimental data on the angular scattering coefficient in a small-angle range and the spectral behavior of the aerosol extinction coefficients.



6.
Databank of Mueller matrices on atmospheric ice crystals of 10-100 mm for interpretation of ground-based and space-borne lidar data

I.V. Tkachev1,2, D.N. Timofeev1, N.V. Kustova1, A.V. Konoshonkin1,2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
Keywords: light scattering, absorption, ice particles, cirrus clouds, laser sensing, lidar

Abstract >>
Solution to the problem of light scattering by hexagonal atmospheric plates and columns and irregularly shaped particles 10 to 100 mm in size is presented in the form of a databank of Mueller matrices. It is intended for interpretation of data from ground-based and space-borne lidars. The solution is obtained for typical wavelengths used in laser sensing: 0.355; 0.532; 1.064 mm, as well as for the wavelengths of the near-IR region: 1.55; 2 and 2.15 mm. The solution was derived with the use of the physical optics method. Based on the Mueller matrices calculated, the color and linear depolarization ratios were derived.



7.
Adaptive imaging and stabilization system for a large-aperture solar telescope

V.P. Lukin, P.A. Konyaev, A.G. Borzilov, E.L. Soin
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: astronomy, solar telescope, atmosphere, turbulence, adaptive optics, cascades of correction

Abstract >>
The ways of further development of a multistage adaptive system for stabilization and image formation at the Large Solar Vacuum Telescope are suggested. The system was created at IAO SB RAS with the technical support of ISTP SB RAS, tested, and proved to be effective. In this system, the first stage provides image stabilization, the second stage corrects the wave-front shape using a flexible mirror controlled by a special wave-front sensor, and the third stage is post-detector frame processing. For post-detector correction of digital images, special processing software was developed based on high-speed parallel algorithms. The system can be improved by means of creating high-speed correlation tracking algorithms and adding a second set of wave-front sensor and flexible mirror mounted in a plane conjugate to the altitude of a layer of strong local turbulence.



8.
Increase in the CuBr-laser pulse duration in the pulse train mode

M.V. Trigub1, V.A. Dimaki1, V.O. Troitskii1, N.V. Karasev1,2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Research Tomsk Polytechnic University, Tomsk, Russia
Keywords: duration, CuBr-laser, amplification, continuous control

Abstract >>
The experimental results of the influence of excitation mode on the CuBr active element pulse duration are presented. One of the distinctive features of the research is the use of the train pulses for copper bromide molecules dissociation. The influence of train pulse number and delay time between the last pulse in a train and the excitation pulse on the laser pulse parameters is investigated. It is shown that the variation in the delay time allows one to change the duration of lasing pulse by more than 3 times.



9.
Three-range panoramic catadioptric navigation video camera system for unmanned miniature drones

M.P. Egorenko, V.S. Efremov
Siberian State University of Geosystems and Technologies, Novosibirsk, Russia
Keywords: panoramic optical system, three-range catadioptric system, ultraviolet, visible, near-infrared regions, video camera, navigation, unmanned miniature drone

Abstract >>
Computer simulation of a panoramic three-range catadioptric system (lens) of a navigation video camera of unmanned miniature drones is presented. The optical system operates using a three-channel radiation receiver sensitive in three spectral regions.



10.
Changes in the radial growth and distribution of CO2 in larches survived the explosion of the Tunguska space body

B.G. Ageev1, V.A. Sapozhnikova1, D.A. Savchuk2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: Tunguska space body, larch discs, СО

Abstract >>
A photoacoustic method was used to analyze gas samples vacuum-extracted from larch discs that survived the explosion of a space body in the Podkamennaya Tunguska area in 1908. The specificity of СО2 accumulation in tree rings after the catastrophe was revealed, which could affect the dynamics of СО2 emission by the trunks into the atmosphere.