Atmospheric and Oceanic Optics最新文献_第4页

Laser Triggering System for Dual-pulse Laser Diagnostics 双脉冲激光诊断的激光触发系统

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Atmospheric and Oceanic Optics Pub Date : 2025-09-04 DOI: 10.1134/S1024856025700356

S. M. Bobrovnikov, E. V. Gorlov, V. I. Zharkov, N. G. Zaitsev

{"title":"Laser Triggering System for Dual-pulse Laser Diagnostics","authors":"S. M. Bobrovnikov, E. V. Gorlov, V. I. Zharkov, N. G. Zaitsev","doi":"10.1134/S1024856025700356","DOIUrl":"10.1134/S1024856025700356","url":null,"abstract":"The two-pulse synchronous excitation technique used for remote laser diagnostics of matter is of great interest, since it significantly expands the capabilities of traditional methods of single-pulse laser action. However, the practical implementation of the technique requires strict synchronization of the times of sending laser pulses and automated control of their time positions. The two-pulse excitation scheme needs in more complex equipment. Standard laser triggering and control tools are expensive, cumbersome, and not always applicable. The paper describes a specialized laser triggering system capable of recording the shape and position of excitation pulses and their displaying on a single time scale. The structural diagram and technical characteristics of the system are presented; an example of its operation as a component of a research setup for remote laser detection of organophosphorus compounds by the two-pulse LF/LIF laser fragmentation technique is given. The developed synchronization system can be used in optical diagnostics, where synchronous action of two or more independent laser sources is required, to set and control the time delay between laser pulses.","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"38 4","pages":"492 - 497"},"PeriodicalIF":0.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990398","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}

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Dynamics of Distribution of Aerosol Fractions in the Surface Air of the Boreal Zone of Western Siberia (Based on Observations at the Fonovaya Observatory)—Part 2. “Snow” Photophoresis 西伯利亚西部北寒带地面大气中气溶胶组分分布的动力学（基于Fonovaya天文台的观测）-第2部分。“雪”光致漂移

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Atmospheric and Oceanic Optics Pub Date : 2025-09-04 DOI: 10.1134/S1024856025700241

M. P. Tentyukov, D. A. Timushev, D. V. Simonenkov, B. D. Belan, K. A. Shukurov, A. V. Kozlov

{"title":"Dynamics of Distribution of Aerosol Fractions in the Surface Air of the Boreal Zone of Western Siberia (Based on Observations at the Fonovaya Observatory)—Part 2. “Snow” Photophoresis","authors":"M. P. Tentyukov, D. A. Timushev, D. V. Simonenkov, B. D. Belan, K. A. Shukurov, A. V. Kozlov","doi":"10.1134/S1024856025700241","DOIUrl":"10.1134/S1024856025700241","url":null,"abstract":"Features of the daily dynamics of aerosol fractions in surface air during the generation of a winter aerosol field above the Fonovaya Observatory of V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, (Tomsk, Russia) are studied. The distributions of hourly average particulate count are analyzed along with the spatial distributions of the probability of transport of moisture-bearing air masses taking into account the time intervals of snow accumulation at the observatory in the first half of winter 2022/23 (from November 17, 2022, to January 30, 2023). It is found that the daily variations in hourly average particulate count in the particle size range d = 0.3–2.0 μm are sometimes determined by radiometric forces, that is, “snow” photophoresis caused by and associated with the manifestation of the microphysical properties of aerosol in the field of infrared radiation outgoing from the snow cover. It is reasonable to assume that “snow” photophoresis certainly affects the radiation balance in the winter atmosphere and should be taken into account when modeling vertical transport of aerosols in the lower troposphere.","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"38 4","pages":"408 - 417"},"PeriodicalIF":0.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990441","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}

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Ground-Level Ozone as a Factor of Increase in Community-Acquired Pneumonia Rate in Moscow in Warm Seasons 地面臭氧是莫斯科温暖季节社区获得性肺炎发病率增加的一个因素

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700095

B. D. Belan, N. V. Dudorova, S. N. Kotel’nikov

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Variability of Multilayer Cloud Field Structure over Western and Eastern Siberia in Summer and Winter in 2006–2023 Based on CALIPSO Data 基于CALIPSO数据的2006-2023年西伯利亚西部和东部夏季和冬季多层云场结构变率

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700083

A. V. Skorokhodov, K. V. Kuryanovich

{"title":"Variability of Multilayer Cloud Field Structure over Western and Eastern Siberia in Summer and Winter in 2006–2023 Based on CALIPSO Data","authors":"A. V. Skorokhodov, K. V. Kuryanovich","doi":"10.1134/S1024856025700083","DOIUrl":"10.1134/S1024856025700083","url":null,"abstract":"One of the indicators of ongoing climate change is the evolution of cloud regimes, both in individual regions and globally. Within this framework, the long-term variability of the structure of multilayered clouds with an optical thickness of less than 15 over Western and Eastern Siberia during the summer and winter seasons from 2006 to 2023 in daytime conditions is estimated based on CALIOP lidar data (CALIPSO satellite). Multilayering refers to the presence of clouds at several levels at the same time located under each other with gaps between them. The applied methodology is based on the use of cloud classification results from daily CALIOP lidar measurements, calculation of seasonal recurrence values for each combination of cloud types in the multilayer structure, deriving time series, determining trends, and evaluating their parameters. It has been found that the fraction of clouds with different numbers of layers over both regions did not significantly change during the period under study. In Western Siberia, the fraction of two-layer clouds is 68% in summer and 71% in winter; in Eastern Siberia, 71 and 75%, respectively. The fraction of three-layer clouds in Western Siberia attains 27% in summer and 25% in winter; in Eastern Siberia, 26 and 23%. The fractions of four- and five-layer clouds do not exceed 5% in both regions together and are almost the same in the two seasons. The most frequent combinations of cloud types in multilayer clouds over Western and Eastern Siberia have been determined. Estimates of linear trends in the fraction of the most frequent combinations in multilayer clouds over the period under study are presented. The results can contribute to improving the accuracy of climate models and radiative transfer estimates.","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"38 3","pages":"290 - 299"},"PeriodicalIF":0.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165605","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}

引用次数: 0

Nonlinear Multiplier and Deep Learning Based Fixed Threshold On-Off Keying Detection for Free-Space Optical Communications 基于非线性乘法器和深度学习的自由空间光通信固定阈值开关键控检测

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700198

X. Liu, Y. Q. Hong, C. Y. Zhai, Y. Gao, N. Liu, W. Y. Liu

{"title":"Nonlinear Multiplier and Deep Learning Based Fixed Threshold On-Off Keying Detection for Free-Space Optical Communications","authors":"X. Liu, Y. Q. Hong, C. Y. Zhai, Y. Gao, N. Liu, W. Y. Liu","doi":"10.1134/S1024856025700198","DOIUrl":"10.1134/S1024856025700198","url":null,"abstract":"On-off keying (OOK) signal is affected by the scintillation effect caused by atmospheric turbulence when it is transmitted through atmospheric channel, which results in intensity fluctuation of received signal. This paper proposes nonlinear multiplier (NM) and deep learning (DL) based fixed threshold OOK detection for free-space optical (FSO) communications to compensate the scintillation effect. The strength of the received signal is improved due to the multiplier characteristic of providing different amplification gains according to different signal strengths. Three kinds of nonlinear multipliers are studied in this paper. However, the NM based fixed threshold OOK detection technique is less effective at higher atmospheric turbulence intensities due to the distortion of the OOK signal extinction ratio (ER) caused by the use of highly non-linear compensation. Therefore, an improved Gated Recurrent Unit (GRU) model is used to assist NM. Simulation experiments were conducted at different turbulence intensities. The results showed that the proposed method outperforms traditional fixed threshold decision (FTD), NM based fixed threshold OOK detection, improved GRU based fixed threshold OOK detection, and adaptive threshold decision (ATD). The atmospheric turbulence scintillation effect is effectively compensated.","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"38 3","pages":"228 - 238"},"PeriodicalIF":0.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164911","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}

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Two-Component Optical Model of Stratospheric Aerosol and Its Application to Interpretation of Lidar Measurements 平流层气溶胶双分量光学模式及其在激光雷达测量数据解释中的应用

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700137

V. A. Korshunov

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Black Carbon and Brown Carbon and Selective Smoke Aerosol Absorption during Massive Wildfires in Alaska in 2019 and Canada in 2023 2019年阿拉斯加和2023年加拿大大规模野火中的黑碳和棕色碳以及选择性烟雾气溶胶吸收

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700058

G. I. Gorchakov, A. V. Karpov, R. A. Gushchin, O. I. Datsenko, E. G. Semoutnikova

{"title":"Black Carbon and Brown Carbon and Selective Smoke Aerosol Absorption during Massive Wildfires in Alaska in 2019 and Canada in 2023","authors":"G. I. Gorchakov, A. V. Karpov, R. A. Gushchin, O. I. Datsenko, E. G. Semoutnikova","doi":"10.1134/S1024856025700058","DOIUrl":"10.1134/S1024856025700058","url":null,"abstract":"Smoky haze which occurs during large-scale wildfires essentially transforms the radiative regime of the atmosphere over large territories. The variability of shortwave radiation fluxes in a smoke-laden atmosphere is driven by variations in the optical and microphysical properties of smoke aerosols, including the spectral dependences of the imaginary part of the refractive index. These dependences are determined by the presence of black carbon, brown carbon, and radiation-selective absorbing organic compounds in aerosol particles. This study analyzes the aforementioned spectral dependences based on AERONET data during large-scale wildfires in Alaska in 2019 and Canada in 2023. The analysis includes the cases of extreme radiation absorption by black and brown carbon, where the imaginary part of the refractive index at a wavelength of 440 nm attained 0.50 and 0.27, respectively. Variations in the spectral dependence of the imaginary part of the refractive index under moderate manifestations of selective absorption of smoke aerosol during massive fires in Alaska and Canada are analyzed. Approximations for the spectral dependence of the imaginary part of the refractive index are suggested. The aerosol radiative forcing at the top of the atmosphere is estimated for the cases of extreme radiation absorption by black carbon and brown carbon in the visible and near-infrared spectral regions and of anomalous selective absorption. The results can be useful in monitoring of the radiative regime of the atmosphere and for the development of atmospheric remote sounding techniques.","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"38 3","pages":"266 - 272"},"PeriodicalIF":0.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165880","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}

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Optical Inspection of Surfaces under Large Strains Using Digital Image Correlation 基于数字图像相关的大应变表面光学检测

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700162

Abdelmeguid Fathy Ahmed Abouellail, A. A. Lugovskoi, M. V. Trigub

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Capabilities of Non-line-of-sight Optical Communications with UAV through Water–Atmosphere Interface 水-大气界面无人机非视距光通信性能研究

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700010

M. V. Tarasenkov, E. S. Poznakharev, A. V. Fedosov, A. N. Kudryavtsev, V. V. Belov

{"title":"Capabilities of Non-line-of-sight Optical Communications with UAV through Water–Atmosphere Interface","authors":"M. V. Tarasenkov, E. S. Poznakharev, A. V. Fedosov, A. N. Kudryavtsev, V. V. Belov","doi":"10.1134/S1024856025700010","DOIUrl":"10.1134/S1024856025700010","url":null,"abstract":"А non-line-of-sight optical (NLOS) communication line with an unmanned aerial vehicle (UAV) through the water–atmosphere interface allows removing the limitation to the UAV position within the transmitter divergence angle during a communication session. However, the capabilities of such communication lines were not previously considered. We experimentally and theoretically estimate the capabilities of an NLOS optical communication line between an underwater transmission system and a flying UAV. Field experiments show a possibility of organizing stable NLOS optical communication at baseline distances of 90 m and UAV flight altitude of 30 m. The simulation of a communication line shows a useful signal to be mainly formed by radiation scattered in the atmosphere at short baseline distances and by radiation scattered in water at long baseline distances. Therefore, the useful signal is maximal at high water turbidity (Secchi depth is 3 m). The results make it possible to analyze the main patterns of generation of a useful signal in communication lines under study and can serve a basis for the creation of such systems.","PeriodicalId":46751,"journal":{"name":"Atmospheric and Oceanic Optics","volume":"38 3","pages":"221 - 227"},"PeriodicalIF":0.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164894","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}

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Efficiency of Resonance and Cascade Schemes of Fluorescence Excitation in Atoms in Mesosphere for Laser Guide Star Creation. Part I. Potassium and Nickel Atoms 激光导星形成中中间层原子荧光激发的共振效率和级联方案。第一部分钾和镍原子

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Atmospheric and Oceanic Optics Pub Date : 2025-07-14 DOI: 10.1134/S1024856025700174

S. M. Bobrovnikov, L. A. Bolbasova, E. V. Gorlov, V. I. Zharkov, V. P. Lukin

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