Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia



Advanced Search

Atmospheric and Oceanic Optics

2022 year, number 11

1.
Line intensities of the H36Cl radioactive isotopologue of hydrogen chloride

A.A. Marinina1, T.I. Velichko2, V.I. Perevalov1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Industrial University of Tyumen, Tyumen, Russia
Keywords: radioactive isotopologue, hydrogen chloride, absorption bands, line intensity, effective dipole moment parameter

Abstract >>
The calculated line intensities of the 1-0, 2-0 and 3-0 absorption bands of the radioactive hydrogen chloride isotopologue H36Cl are presented. The line positions were calculated using the Dunham coefficients obtained with the help of the isotopic independent spectroscopic constants. The line intensities of these bands were calculated using the effective dipole moment parameters obtained with the help of the isotopic substitution equations based on the effective dipole moment parameters of the H35Cl isotopologue. The latter were fitted to the line intensities presented in the HITRAN2020 database.
																								



2.
Study of the methane spectrum near 1653 nm in the 298-720 temperature range with a diode laser

D.M. Plastinina1,2, E.N. Chesnokov1
1V.V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the RAS, Novosibirsk, Russia
2National Research Novosibirsk State University, Novosibirsk, Russia
Keywords: methane spectrum, collisional broadening, diode laser, Fabry-Perot interferometer

Abstract >>
The methane spectrum is studied near R (3) and R (4) multiplets of the first vibrational overtone in the 298-720 K temperature range with a tuning diode laser. We have developed the technique for laser radiation measurement and frequency calibration with the use of a high-stability plain-mirror interferometer. The coefficients of collisional broadening by nitrogen are calculated at different temperatures.
																								



3.
Pure NH3 spectrum measurements and analysis of overlapping absorption lines in 6611.6-6613.5 cm-1 region

V.A. Kapitanov1, Ya.Ya. Ponurovskii2, K.Yu. Osipov1, Yu.N. Ponomarev1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russia
Keywords: diode laser spectroscopy, spectral line, lineshape, line parameters

Abstract >>
The results of experimental studies of absorption spectra of pure NH3 at room temperature in the ranges 6604.3-6606.3 and 6611.6-6613.5 cm-1 and pressure of up to 0.04 atm are presented. The measurements were carried out at the Department of Diode Laser Spectroscopy of the Institute of General Physics at a high-sensitivity high-resolution diode laser spectrometer with a signal-to-noise ratio of ~ 1400. The spectra were analyzed using a Voigt contour. The results of retrieving the parameters of spectral absorption lines are presented: the positions of centers, intensities, and coefficients of collisional self-broadening and shifts. A comparison was made with the parameters from HITRAN database. A two-fold difference between the measured intensities of a number of lines and the HITRAN values was found.
																								



4.
Dimer absorption in the long-wave wing of the rotational H2O band

O.B. Rodimova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: water vapor, continuum absorption, spectral line wings, dimer absorption

Abstract >>
The absorption spectrum of stable dimers in the long-wave wing of the rotation H2O band is estimated proceeding from available experimental data on the H2O continuum absorption in this region and calculations on the basis of the asymptotic line wing theory. The spectral line contour of the rotational band describing the spectral and temperature behavior of the H2O continuum absorption in the 8-12 mm range was used in the calculations. The spectrum derived does not conflict with computations with the dimer model of the continuum absorption.
																								



5.
Information content of ground-based FTIR method for atmospheric HNO3 vertical structure retrieval

Ya.A. Virolainen, Yu.M. Timofeyev, A.V. Poberovsky, A.V. Polyakov
Saint Petersburg State University, St. Petersburg, Russia
Keywords: atmospheric nitric acid, information content and accuracy of measurements, vertical resolution, FTIR ground-based measurements

Abstract >>
Nitric acid plays an important role in atmospheric chemistry; therefore, it is currently monitored by various methods and instruments. Ground-based FTIR method based on spectral measurements of solar radiation by Bruker Optics IFS 125HR spectrometers allows to retrieve not only the total column HNO3, but also its content in several atmospheric layers. We analyze time series of HNO3 measurements at St. Petersburg NDACC site between 2009 and 2021. We demonstrate that FTIR measurements can provide information on HNO3 content in at least two atmospheric layers; the degrees of freedom for signal in average totals 3.1. The mean random error of HNO3 measurements amount to 3.9, 14 and 1.6% for total atmospheric, tropospheric (up to 15 km), and stratospheric (above 15 km) content, respectively. Thus, the FTIR-method considered is more sensitive to changes in the stratospheric HNO3 content. The absorption of solar radiation by nitric acid in the measured spectra overlaps with the absorption by water vapor; therefore, the information content and accuracy of HNO3 measurements are maximal in winter and minimal in summer: in winter, measurements are carried out mainly at low sun and low humidity, and in summer, vice versa.
																								



6.
On estimation of the height of a turbulent mixing layer from the height-time distributions of the Richardson number

V.A. Banakh, A.V. Falits, A.M. Sherstobitov, I.N. Smalikho, A.A. Sukharev, E.V. Gordeev, I.V. Zaloznaya
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: wind lidar, temperature profiler, turbulent mixing layer height, Richardson number, turbulent energy dissipation rate

Abstract >>
The results of a comparison of the time series of the turbulent mixing layer height, which is determined from the height-time distributions of the kinetic energy dissipation rate of turbulence and from the height-time distributions of the gradient Richardson number are presented. It is found that only under conditions of atmospheric boundary layer instability due to convection, estimation of the height of the turbulent mixing layer from the height-time distributions of the Richardson number gives results close to those obtained from the distributions of the kinetic energy dissipation rate of turbulence. In other cases, the height of the mixing layer found from the Richardson number can be significantly underestimated.
																								



7.
Experimental study of the reflection of light radiation from crystalline particles in the lower troposphere

V.P. Galileiskii, A.I. Grishin, A.I. Elizarov, A.V. Kruchkov, G.G. Matvienko, A.M. Morozov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: specular reflection, crystalline particles, interference, diffraction, wave optics

Abstract >>
The phenomenon of reflection of light radiation from crystalline particles oriented in the atmosphere, as well as the physical laws and possible conditions contributing to its occurrence, are considered. A variant of registration of mirror layers using a panoramic optical station (AllSky system) is described.
																								



8.
Analysis of derivatives in atmospheric hydrothermodynamics equations with the use of experimental data. Part 1: Equation for the temperature field

V.A. Gladkikh1, A.A. Mamysheva1, I.V. Nevzorova1, S.L. Odintsov1,2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2RussiaNational Research Tomsk State University, Tomsk, Russia
Keywords: wind, meso-gamma scale, surface layer, gray zone, temperature, turbulence

Abstract >>
The time and space derivatives of the air temperature and its products with the wind vector components are analyzed for the cases where the temperature and wind fields are resolved into the deterministic, meso-gamma scale, and turbulent parts. Ultrasonic thermoanemometer measurements in the surface air layer are used for the analysis. The variability ranges of the derivatives are estimated including meso-gamma scale variations in the temperature and wind fields. The variability ranges of these derivatives are compared with those of the classical derivatives (when only deterministic and turbulent parts are considered). The derivatives of the components which contain meso-gamma scales are shown to be comparable with the components which include only turbulent parts.
																								



9.
Sensitivity of the numerical weather forecast fields to the variations in St. Petersburg surface parameters

E.M. Ladokhina1,2,3, K.G. Rubinshtein1,4, A.V. Kulyushina2,5
1Hydrometeorological Centre of Russia, Moscow, Russia
2Limited Liability Company «MicroStep-Mis, St. Petersburg, Russia
3North-West Department of Hydrometeorology and Environmental Monitoring, St. Petersburg, Russia
4Nuclear Safety Institute, Russian Academy of Sciences, Moscow, Russia
5Udmurt State University, Izhevsk, Russia
Keywords: numerical weather prediction, WRF-ARW, St. Petersburg, physical parameters of underlying surface, urban heat island

Abstract >>
The influence of physical parameters, which describe the St. Petersburg surface properties in the WRF-ARW model, on the forecast of surface meteorological elements is studied. The results are estimated for the cases June 14-22, 2015, when intense positive temperature anomaly occurred in St. Petersburg in comparison with the surroundings. The parameters were chosen from the analysis of similar studies for several cities of the world. Experiments with serial variations in the parameters selected showed that decrease in the surface albedo, soil moisture content, and surface emissivity and an increase in the roughness length improved the forecast quality for the city in comparison with a control experiment. In final experiment, the concurrent variations in the urban surface physical parameters, in accordance with the results of serial experiments, significantly improved the simulation of the citys thermal anomaly in the model. In the time periods corresponding to the intense urban heat island occurrence, the difference in the surface temperatures between the control and final forecasts could attain 2 C for the St. Petersburg model area. Under certain synoptic conditions, the variations in the urban surface parameters in the model affect the forecast of meteorological fields within a radius of 150 km from the center of the metropolis.
																								



10.
On the applicability of the Beer-Lambert-Bouguer law for estimating the absorption coefficient of light rays in a cloud of dispersed liquid

A.V. Zagnitko1, N.P. Zaretsky1, L.I. Menshikov1,2, P.L. Menshikov1,2
1National Research Center «Kurchatov Institute, Moscow, Russia
2Moscow Institute of Physics and Technology (State University), Moscow, Russia
Keywords: light scattering, optical density, scattering phase function, aerosol, absorption coefficient, Bouguer-Lambert-Beer law, geometrical optics, mean free path, diffraction

Abstract >>
The conditions for applicability of the Bouguer-Lambert-Beer law for aerosol clouds with particles much larger than the photon wavelength are derived in the form of an analytical formula. The corrections to this law due to diffraction scattering and the geometry of a measuring device are estimated. The resulting formula is useful for processing single experiments that cannot be repeated for some reason.
																								



11.
Estimation of the limiting sensitivity of the laser fragmentation/laser-induced fluorescence method for the detection of vapors of nitrocompounds in the atmosphere

S.M. Bobrovnikov1, E.V. Gorlov1, V.I. Zharkov2
1National Research Tomsk State University, Tomsk, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: laser fragmentation, nitrocompound, nitrobenzene, nitrotoluene, laser-induced fluorescence, nitric oxide, NO-fragment

Abstract >>
The limiting sensitivity of a method for detecting vapors of nitrocompounds in the atmosphere based on laser fragmentation/laser-induced fluorescence is estimated in calculations with the developed kinetic model of the LF/LIF process. The calculations take into account the influence of atmospheric nitrogen dioxide as a limiter of the sensitivity of the method when operating in a real atmosphere. It is shown that if the concentration of nitrogen dioxide in the atmosphere does not exceed 10 ppb, the maximum detectable concentrations of nitrobenzene and o -nitrotoluene vapors are ppb-level. It was also shown that the one-color excitation method usually used for the detection of nitrocompounds does not allow attaining the maximum efficiency of the LF/LIF process.
																								



12.
Optical thickness of the atmosphere above peak Terskol

A.Yu. Shikhovtsev1, V.B. Khaikin2, P.G. Kovadlo1, P. Baron3
1Institute of Solar-Terrestrial Physics of the Siberian Branch of the RAS, Irkutsk, Russia
2Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS), Nizhnij Arkhyz, Russia
3National Institute of Information and Communications Technology, NICT, Tokyo, Japan
Keywords: telescope, astroclimate, precipitable water vapor, optical thickness, ERA-5 database

Abstract >>
The paper describes the results related to variations in precipitable water vapor at the peak Terskol site. Applying MPM Liebe model and MOLIERE model and using JPL and HITRAN configurations, we estimated optical thickness of the atmospheric column above peak Terskol for 100, 150 and 225 GHz.
																								



13.
Prospects for improving the energy characteristics of a copper vapor laser

H.A. Baalbaki1,2, N.A. Yudin1,3, N.N. Yudin1
1National Research Tomsk State University, Tomsk, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science
3V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: copper vapor laser, breakdown, energy input cutoff

Abstract >>
The electro-physical process in the discharge circuit of a copper vapor laser (CVL) with an LT-10Cu industrial gas-discharge tube has been studied. It is shown that the pumping of the active medium of the CVL is carried out in two stages. During the first (preparatory) stage, the capacitive components of the laser discharge circuit are charged from the storage capacitor, and during the second stage, the active medium is directly pumped. The transition from the preparatory stage to the pumping stage is carried out as a result of breakdown. It is shown that under these conditions it is possible to achieve a practical CVL efficiency of ~ 1% in pump circuits with magnetic compression units and ~ 2.5-3% when the energy input is cut off after the generation pulse. The conditions for implementing the mode of cutting off the energy input after the generation pulse are considered.