{"title":"The Influence of Bubstons on the Operation of Underwater Optical Communication Systems","authors":"V. F. Myshkin, V. A. Khan, R. R. Yarullov","doi":"10.1134/S1024856026700259","DOIUrl":"10.1134/S1024856026700259","url":null,"abstract":"<p>The development of the World Ocean shelf requires a variety of underwater communication tools. In this work, we simulated the shape of electrical pulses generated by 1-ns optical pulses from a photodetector and propagating through a water layer containing bubstons with allowance for scattering from the volume behind the emitter. Attenuation was calculated using Bouguer’s law; cluster scattering efficiency factors were estimated within the Mie theory for submicron particles with a refractive index lower than that of water. It was found that the broadening of a 1-ns optical pulse due to the scattering by bubstons considering the volume behind the emitter does not exceed 0.1 ns at a distance of 20 m; nanobubble clusters in transparent water were found to limit underwater wireless optical communication lines due to radiation attenuation. The results can be used in the design of devices for underwater wireless optical communication.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"438 - 443"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Calculations of Self-broadening Parameters of Water Vapor Lines in a Wide Spectral Region","authors":"V. I. Starikov","doi":"10.1134/S1024856026700235","DOIUrl":"10.1134/S1024856026700235","url":null,"abstract":"<p>The comparative analysis of experimental coefficients of self-broadened water vapor line width γ (3641 values) and shift δ (2410 values) in the 1000–14 000 cm<sup>−1</sup> spectral range is performed. It has shown that the coefficients γ measured for the same lines in different works systematically differ, with a maximal difference of more than 20%. The shift coefficients δ of many strong lines differ even in sign. In this work, the coefficients γ and δ are calculated for 17 vibrational bands by the semi-classical method with the exact trajectory model; a sample of the calculated values is presented for 270 vibrational-rotational transitions. The results can be useful for the analysis of water vapor spectra in real conditions of the Earth’s atmosphere.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"413 - 421"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ph. A. Kozhevnikov, M. R. Konnikova, A. S. Sinko, A. A. Angeluts
{"title":"Machine Learning Methods for Recognition of Harmful Impurities in the Atmosphere from Spectral Data","authors":"Ph. A. Kozhevnikov, M. R. Konnikova, A. S. Sinko, A. A. Angeluts","doi":"10.1134/S1024856026700351","DOIUrl":"10.1134/S1024856026700351","url":null,"abstract":"<p>Expansion of instrumental and analytical methods for identifying harmful atmospheric impurities is an important environmental task. The work focuses on developing a comprehensive approach to detection of harmful impurities in atmospheric air based on absorption spectra of air containing harmful impurities measured along a path by pulsed terahertz spectroscopy methods. A neural network is developed for spectral data analysis; it is trained with specially generated arrays of model absorption spectra of gas mixtures of different qualitative and quantitative compositions. It is shown that the neural network is capable of identifying six gas components in concentrations of down to 0.01 ppm with accuracy of 90–95%. A series of experiments with real gases confirms the sensitivity of the THz spectroscopy method to low gas concentrations in the mixture. The results show the sufficiently high sensitivity of the combined method to both single gases and gas mixtures and, hence, its applicability to environmental monitoring.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"526 - 533"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. A. Laptinskiy, G. N. Chugreeva, A. M. Vervald, I. V. Plastinin, T. A. Dolenko
{"title":"Carbon Dots as Luminescent Nanosensors in Determining the Composition of Multicomponent Liquid Media","authors":"K. A. Laptinskiy, G. N. Chugreeva, A. M. Vervald, I. V. Plastinin, T. A. Dolenko","doi":"10.1134/S1024856026700338","DOIUrl":"10.1134/S1024856026700338","url":null,"abstract":"<p>Current technological development increases ecological burden. To monitor the state of aqueous media, sensors capable of simultaneously detecting the presence and concentration of several ions are required. The work suggests carbon dots as luminescent nanosensors of heavy metal ions in aqueous media. Machine learning methods applied to photoluminescence spectra of nanoparticles in multicomponent aqueous salt solutions made it possible to simultaneously determine the concentrations of desired substances. The quality of solving the inverse problem by different neural networks is analyzed and compared; recurrent neural networks are shown to be less efficient. Comparison between the results of neural networks and X-ray fluorescence analysis in determining the ionic composition of industrial process media shows the accuracy of the developed nanosensor to fully meet the requirements for monitoring and controlling the composition of waste and process water.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"511 - 516"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. I. Nakhaev, V. A. Semenov, A. V. Chernokulsky, I. B. Belikov, V. A. Belousov, A. Yu. Artamonov
{"title":"Simulation of Air Pollution by Carbon Monoxide in Kislovodsk: Effects of Orography and Vehicle Emission Correction","authors":"M. I. Nakhaev, V. A. Semenov, A. V. Chernokulsky, I. B. Belikov, V. A. Belousov, A. Yu. Artamonov","doi":"10.1134/S1024856026700296","DOIUrl":"10.1134/S1024856026700296","url":null,"abstract":"<p>Simulation of air pollution in mountainous regions is difficult due to the complex interaction of orography with atmospheric dynamics and uncertainty in anthropogenic emission. This paper discusses simulation of atmospheric pollution by carbon monoxide (CO) in complex mountainous terrain for the case of Kislovodsk region with the use of the mesoscale meteorological model WRF and the chemical transport model CHIMERE. The results are validated against instrumental measurements at the High-Mountain Scientific Station of A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences. It is shown that refining the EMEP emission database by incorporating local features of the road network (density and road types) and their daily/weekly dynamics enables the spatial distribution of pollution sources to more closely approximate the actual layout of the regional road network and improves the accuracy of reproducing the daily cycle of CO concentrations. The contribution of orographic factors to the total pollution has been assessed. It is ascertained that the complex terrain of the region accounts for 20–50% of the average CO concentration level and creates zones of pollutant accumulation and dispersion. The statistical analysis shows satisfactory agreement between the simulation results and observations. The study confirms the feasibility and efficiency of the WRF-CHIMERE system in monitoring and analyzing atmospheric air quality in resort regions with complex orography. The results can serve a foundation for fundamental and applied scientific research aimed at studying the causes of periods with adverse environmental conditions. The air quality simulation can be used by local government authorities for urban planning, road network optimizing, developing recreational areas with allowance for orography, and improving regional environmental monitoring systems.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"473 - 482"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. F. Tarasenko, A. S. Kirillov, N. P. Vinogradov, V. A. Kirillov
{"title":"Effect of Oxygen on Spectral Energy Densities of Emission Bands of B3Πg and C3Πu States of Molecular Nitrogen at Pressures of 0.04–0.4 Torr","authors":"V. F. Tarasenko, A. S. Kirillov, N. P. Vinogradov, V. A. Kirillov","doi":"10.1134/S1024856026700247","DOIUrl":"10.1134/S1024856026700247","url":null,"abstract":"<p>Properties of high-altitude discharges in the atmosphere of the Earth and other planets and their satellites are actively studied in past three decades due to the acquisition of new data, primarily because of improvement of optical observation methods. This work experimentally and theoretically studies the ratios <i>W</i><sub>1+</sub>/<i>W</i><sub>2+</sub> of radiation energy spectral density of four bands of the 1st positive nitrogen system (1+) to a band of the 2nd positive nitrogen system (2+) with a wavelength of 337 nm. The ratios are compared for atmospheric air and nitrogen with low impurity content at pressures of 0.04–0.4 torr. It is shown that the quenching rate of C<sup>3</sup>Π<sub>u</sub> triplet states of molecular nitrogen increases in a nitrogen-oxygen mixture, which decreases the ratios <i>W</i><sub>1+</sub>/<i>W</i><sub>2+</sub>. It is confirmed that quenching of B<sup>3</sup>Π<sub>g</sub> state by nitrogen and oxygen molecules increases with the air density in the Earth’s atmosphere. The results can be useful for studying physical processes occurring against the background of the interaction of high-energy electrons with gases in mainly nitrogen atmospheres of certain planets and their satellites.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"422 - 428"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Simulation of Optical Spectra and Photolysis of Phenolic Compounds","authors":"V. A. Pomogaev, O. N. Tchaikovskaya","doi":"10.1134/S1024856026700302","DOIUrl":"10.1134/S1024856026700302","url":null,"abstract":"<p>Phenol enters the environment due to combustion of plants and biomass, as well as through anthropogenic emissions. Phenolic compounds can act as precursors to organic aerosols; they adversely affect human health and reduce atmospheric visibility. The static absorption spectra of phenol and its volatile substituted compounds (<i>p</i>-cresol and vanillin) presented in this work were obtained and analyzed using computer simulations based on quantum mechanical molecular dynamics. The optical spectra were averaged over excited instantaneous molecular conformers fluctuating along system’s evolution trajectories. The photodynamic dissipation of electronically excited states of the molecules is studied by generating trajectories in nonadiabatic molecular dynamics. Changes in the electronic structure of phenol, <i>p</i>-cresol, and vanillin, along with the crossing points and dissociation of potential energy surfaces, are obtained using the mixed-reference spin-flip approach within the time-dependent density functional theory. The O–H bond breaking in the hydroxyl group followed by deprotonation causes minor structural deformations in the molecules under study. It is shown that, upon excitation, dissociation of the hydroxyl group occurs via an electronic transition to the σ–MO localized on the elongated O–H bond. The results of the work can be used in ecology of the environment for developing devices based on photochemistry for monitoring and purification from phenolic contaminations.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"483 - 487"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. V. Nikolaev, A. V. Zherdeva, G. K. Raspopin, Yu. V. Kistenev
{"title":"Remote and Local Monitoring of Water Reservoir Eutrophication","authors":"V. V. Nikolaev, A. V. Zherdeva, G. K. Raspopin, Yu. V. Kistenev","doi":"10.1134/S1024856026700272","DOIUrl":"10.1134/S1024856026700272","url":null,"abstract":"<p>The work addresses the problem of water body eutrophication and approaches to monitoring this process. It describes key biophysical and chemical markers of water object eutrophication, including the content of chlorophyll-<i>a</i>, suspended solids, and nutrients in water, as well as volatile molecular markers of eutrophication which can be present in air near the water surface. The comparative analysis of experimental, process-based, and theoretical models of this process is performed. Since the volume and quality of experimental data significantly affect the predictive accuracy of eutrophication models, we focus on techniques for accumulating these data, including remote and local sensing of water body parameters. Among the latter, laser gas analysis techniques for detecting volatile markers of eutrophication near water surface are considered. Based on a literature review, a list of the most informative volatile molecular markers of eutrophication emitted from the water surface into the atmosphere has been compiled, i.e., carbon dioxide (CO<sub>2</sub>), hydrogen sulfide (H<sub>2</sub>S), methane (CH<sub>4</sub>), nitric oxide (N<sub>2</sub>O), geosmin, and 2-methylisoborneol. The importance of monitoring the phosphorus derivative phosphine (PH<sub>3</sub>) is noted, since it is an indicator of the phosphorus cycle and a potential greenhouse gas. The lack of data on its sources and processes of synthesis is emphasized. Based on data on quantum spectral transitions, recommendations are provided for recording PH<sub>3</sub> and other volatile markers of eutrophication near the water–air interface using IR gas absorption spectroscopy.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"453 - 461"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. P. Savkin, D. A. Sorokin, D. V. Beloplotov, A. G. Nikolaev, M. V. Shandrikov, A. A. Cherkasov, V. I. Gushenets, A. S. Bugaev, U. V. Khomutova, D. Yu. Ignatov
{"title":"Influence of Power Supply Modes on the Dynamics of Atmospheric Pressure Glow Discharge Radiation in Mg Atom Flow Generation Mode","authors":"K. P. Savkin, D. A. Sorokin, D. V. Beloplotov, A. G. Nikolaev, M. V. Shandrikov, A. A. Cherkasov, V. I. Gushenets, A. S. Bugaev, U. V. Khomutova, D. Yu. Ignatov","doi":"10.1134/S1024856026700429","DOIUrl":"10.1134/S1024856026700429","url":null,"abstract":"<p>The dynamics and spatial distribution of atmospheric pressure glow discharge plasma radiation in an argon flow in the plasma generation mode with metal particles is studied. The discharge system consisted of two symmetrical tantalum crucible-electrodes with inserts of a low-melting metal (magnesium) and operated at a current of 100–600 mA, a relatively high discharge voltage of 150–200 V, and an argon flow rate of 1–3 L/min without changing to spark or arc discharge modes. A discharge was self-maintained in the pulse mode due to afterglow of decaying plasma in the interpulse period. It is shown that emission from metal atoms is the strongest near the glow discharge cathode regardless of the power supply mode (direct or unipolar or bipolar pulse current). The results of this work can be used in aerosol flow generation, synthesis of nanostructured materials, and optical radiation generation by gas discharge.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"568 - 577"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. N. Smalikho, V. A. Banakh, A. V. Falits, A. M. Sherstobitov, A. A. Sukharev, E. V. Gordeev
{"title":"Three-Dimensional Visualization of the Wind Turbine Wake from Coherent Doppler Lidar Data","authors":"I. N. Smalikho, V. A. Banakh, A. V. Falits, A. M. Sherstobitov, A. A. Sukharev, E. V. Gordeev","doi":"10.1134/S1024856026700284","DOIUrl":"10.1134/S1024856026700284","url":null,"abstract":"<p>Studying wind turbine wakes is essential for optimizing wind turbine arrangement within wind farms. Pulsed coherent Doppler lidars (PCDLs) are the most effective tools for such studies. This paper suggests a new method for three-dimensional visualization of wind speed within a wake based on PCDL measurements. Numerical simulation shows that this method enables wind speed deficit estimates with a relative error of no more than 4%. An atmospheric experiment with the use of this three-dimensional visualization method reveals that the wake cross section exhibits a wind speed deficit structure close to an annular distribution. The results are consistent with the numerical simulation data obtained using the LES and RANS methods. The method presented can be used in experimental studies of the fine structure of wind turbine wakes.</p>","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"39 4","pages":"462 - 472"},"PeriodicalIF":0.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}