A technique for processing measurements with 4- and 9-channel transparency meters developed at the Department of Marine Optics and Biophysics of Marine Hydrophysical Institute are discussed. A system of orthogonal functions for beam attenuation coefficient of coastal waters near Sevastopol was derived on the basis of new measurements with a 9-channel transparency meter. It was used to retrieve the spectral distribution of the beam attenuation coefficient in a wide spectral range from measurements in two (460 and 625 nm) spectral channels. The technique suggested was used to calculate the bio-optical characteristics from the beam attenuation coefficient measured in two expeditions of the R/V “Biryuza” in September 9-10, 2015, and September 12-13, 2016, in the coastal waters of Sevastopol. The main features of the obtained distributions of dissolved organic matter absorption and suspended matter scattering in both surveys are connected with the plume upwelling to the sea surface. The existence of the plume is a consequence of emergency state of the underwater pipe of the wastewater discharge system.
Conditions of THz generation in laser filament from ultrashort pulses under aberrations in one- and two-color optical scheme are observed. Possibilities of controlling THz radiation pattern by electric field and aberrations in focusing beam are discussed.
T.V. Khodzher1, G.S. Zhamsueva2, A.S. Zayakhanov2, A.L. Dementeva2, V.V. Tsydypov2, Yu.S. Balin3, I.E. Penner3, G.P. Kokhanenko3, S.V. Nasonov3, M.G. Klemasheva3, L.P. Golobokova1, V.L. Potemkin1 1Limnological Institute of the Siberian Branch of the RAS, 3, Ulan-Batorskaya str., 664033, Irkutsk, Russia 2Institute of Physical Material Science of the Siberian Branch of the RAS, 670047, Ulan-Ude, 8, Sakhyanovoy str 3V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: оз. Байкал, тропосферный озон, окислы азота, аэрозоль, лидар, лесные пожары, НИС «Академик В.А. Коптюг», Lake Baikal, tropospheric ozone, nitrogen oxides, aerosol, lidar, forest fires, research vessel “Academik V.А. Koptyug”
The paper presents the results of complex experimental studies of gas impurities and the vertical structure of aerosol in the atmosphere above Lake Baikal in July 2018 from the research vessel “Academik V.А. Koptyug”. Simultaneous observations were made at the “Boyarsky” station, located in the south-eastern part of Lake Baikal. A brief description of the equipment used in the experiments is given; some preliminary results of the analysis of the data obtained are discussed.
D.A. Marakasov1, V.M. Sazanovich1, R.Sh. Tsvyk1, A.N. Shesternin1, D.A. Gubanov2 1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia 2Khristianovich Institute of Theoretical and Applied Mechanics of Siberian Branch of Russian Academy of Sciences, 4/1, Institutskaya str., Novosibirsk, 630090, Russia
Keywords: сверхзвуковая струя, акустическое поле, волновой фронт, частотный спектр, микрофоны, дискретные частоты, акустический шум, supersonic jet, acoustic field, wave front, frequency spectrum, microphones, discrete frequencies, acoustic noise
Subsection: ACOUSTOOPTICAL AND RADIOOPTICAL METHODS OF ENVIRONMENTAL STUDIES
The article presents the results of experimental studies of the acoustic field generated by a supersonic jet at the installation of the VJU ITPM SB RAS. The measurements were made with 9 microphones placed symmetrically with respect to the jet axis. The shape of the phase front of the sound wave, the spectra of broadband acoustic noise and discrete components with high temporal and spatial resolution are analyzed. It is shown that the structure of turbulence in the acoustic field is inhomogeneous and is formed by several sources.
V.A. Gladkikh, I.V. Nevzorova, S.L. Odintsov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: порывы ветра, приземный слой, турбулентность, wind gusts, surface layer, turbulence
Subsection: ACOUSTOOPTICAL AND RADIOOPTICAL METHODS OF ENVIRONMENTAL STUDIES
The structure of strong wind gusts in the surface air layer over an urban territory and a natural landscape is analyzed. Experimental data obtained with ultrasonic anemometers-thermometers at altitudes of 5 and 10 m (natural landscape) and 17 m (urban territory) above the surface have been examined. Contributions of the longitudinal and transverse components to wind gusts have been estimated. Motions to the right from the main flow and from top down have been found to predominate somewhat in wind gusts.
S.A. Soldatenko, R.M. Yusupov
St. Petersburg Institute for Informatics and Automation of the Russian Academy of Sciences, 14-th Linia, VI, No. 39, St. Petersburg, 199178, Russia
Keywords: изменение климата, глобальное потепление, импульсная переходная функция, неравновестный отклик климата, стратосферный аэрозоль, climate change, global warming, impulse response function, transient climate response, stratospheric aerosols
E.K. Samygina1, A.I. Klem2,3 1National Research University, Krasnokazarmennaya 14, Moscow, 111250, Russia 2N.E. Bauman Moscow State Technical University, Russia, 107005, Moscow, 2-ya Baumanskaya str., 5 3P.N. Lebedev Physical Institute of the Russian Academy of Science, The Astro Space Center, 53 Leninskij Prospekt, 119991, Moscow, Russia
Keywords: космический телескоп, составное главное зеркало, многоосевые сервоприводы, система адаптивного управления, space telescope, the composite primary mirror, multi-axis servodrives, the adaptive control system
Currently, the scientific community is increasingly in demand for large-sized telescopes, which include the developed international project of the Millimetron space telescope with a composite main mirror diameter of ten meters. Creating an effective space telescope is associated with solving the problem of ensuring the high quality of observational information received by the telescope. The successful solution of this problem is largely determined by the task of ensuring high fidelity and maintaining the shape of the composite main telescope mirror (RMS 1 x 10-5 m [1, 3]) which can be solved using the adaptive control system of the space telescope. The article describes the developed mathematical model of the adaptive control system of the composite main telescope mirror, similar in characteristics to the Millimetron project, and presents the results of numerical simulation of the adaptive control system taking into account the limitations of the hardware and software implementation. According to the results of the simulation, an estimate was made of the error in maintaining the shape of the composite main mirror, confirming the applicability of the developed mathematical model.
The results of creation of new techniques and technical means that allow the use of small-sized unmanned aerial vehicles (UAVs) in environmental monitoring of marine areas according to the MARPOL 73/78 international convention requirements are presented. The hard- and software complex developed for an oil spill recognition system with elements of artificial intelligence is described. The results of laboratory experiments on the identification of oil spills by the laser induced fluorescence (LIF) along with the technique for recording upward solar radiation spectrum are given.
V.V. Zuev1,2, D.P. Mordus1,3, A.V. Pavlinskii1 1Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, 634055, Tomsk, 10/3, Academichesky ave 2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia 3Aviamettelekoma Roshydromet, 1, Deputatskaya, Novosibirsk, 630099, Russia
Keywords: обледенения воздушных судов, предупрежденность наличия явления, успешность прогноза, формула Годске, модель Шульца-Политович, aircraft icing, phenomenon presence warning, forecast accuracy, the Godske formula, the Schulz-Politovich model
Subsection: COMMUNICATIONS
The results of verification of the aircraft icing forecast based on the remote method for determining the areas of potential icing in the lower kilometer layer, are presented. The evaluation was carried out on the basis of the calculation of the presence warning of the dangerous meteorological phenomenon, in this case, the icing of the aircraft. The method of calculating of the phenomenon presence warning, which corresponds to the method used in the aviation forecasting units for the calculation of accuracy, is described. The proposed method takes into account not only time but also height. The calculations showed that the proposed remote method successfully predicted aircraft icing hazard, both using the Godske formula and the Schulz-Politovich model.
