August 2024
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4 Reads
Russian Meteorology and Hydrology
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August 2024
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4 Reads
Russian Meteorology and Hydrology
June 2024
Meteorologiya i Gidrologiya
The spatiotemporal distribution of the lightning activity radar characteristics and parameters for two supercells with a lifetime of more than 10 hours in the North Caucasus on August 19, 2015 is analyzed. It has been shown that despite similar radar characteristics of clouds, there were significant differences in the parameters of the supercell lightning activity. The data on variations in the types of lightnings, their polarity and current characteristics are interpreted in terms of their diagnostic and prognostic potential. The need for further studies on the spatiotemporal structure of the electrically active zones of deep convective clouds is considered.
May 2023
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5 Reads
IZVESTIYA SFedU ENGINEERING SCIENCES
В настоящее время физика облаков и активных воздействий на них постепенно пере-ходит от этапа изучения "элементарных" облачных процессов к этапу изучения облаков вцелом с учетом их системных свойств. Одним из направлений исследований на этом этапестановится изучение роли системных свойств облаков в формировании их макро- и микро-структурных характеристик. Именно эти свойства являются основными факторами,влияющими на формирование структуры облаков. В статье представлены некоторые ре-зультаты исследований роли одного из таких свойств облаков, а именно взаимодействияоблаков с окружающей их атмосферой (свойство иерархичности систем). В качестве спо-соба их взаимодействия рассмотрен механизм, обусловленный аэрозольным составом ат-мосферы. Методика исследований основана на предположении, что на интенсивностьобразования кристаллов в облаках влияет содержание в атмосфере аэрозольных частицдостаточной концентрации, обладающих льдообразующими свойствами (ядер сублима-ции). Для расчетов использовалась трехмерная нестационарная модель конвективных об-лаков. Интенсивность образования кристаллов в облаке менялась путем варьирования зна-чения параметра в выражении для источника кристаллов в модельных уравнениях для об-лачной среды. В работе также обсуждается современное состояние проблемы активныхвоздействий на конвективные облака с целью управления процессами осадкообразования.Для осуществления успешного активного воздействия необходимо определение локальнойобласти в облаке, в которой условия благоприятны для воздействия и концентрации час-тиц реагента, которую следует обеспечить в данной области в каждый момент времени.Модельные расчеты показали, что незначительное увеличение содержания аэрозольныхчастиц в атмосфере привело к увеличению значений максимальной лёдности и суммарнойводности, а также лёдности при одновременном уменьшении максимальной водности воблаке. При этом его макроструктурные характеристики практически не изменились.Дальнейшее решение задач требует разработки эффективных методологий моделирова-ния активного воздействия на конвективные облака.
January 2023
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6 Reads
January 2023
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3 Reads
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2 Citations
Izvestiya Atmospheric and Oceanic Physics
December 2022
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15 Reads
The article investigates the role of the cloud system properties based on a comparison of the results of calculations of the formation and development of clouds corresponding to the real and model structures of the wind field in the atmosphere. In this case, the hierarchy property is considered, i.e., the interaction of convective clouds with the surrounding atmosphere, due to the structure of the wind field in the atmosphere. A three-dimensional unsteady model of thunderstorm clouds with a detailed account of microphysical processes was used for the research. The results of numerical experiments are presented in order to study the role of the interaction of convective clouds with the surrounding atmosphere.KeywordsThunderstorm cloudsSystem propertiesRoleHierarchy propertyInteraction of clouds with the surrounding atmosphereThree-dimensional model
December 2022
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8 Reads
The reasons for the slowdown in the development of the convective cloud physics and active influences on them in recent decades are discussed. As the results of the analysis showed are that the present period of time is a transitional one for this scientific direction: there is a transition from the stage of studying “elementary” processes in clouds to the stage of studying the formation and development of clouds as a whole, considering their systemic properties. The main tasks arising at the coming stage of its development are formulated. It is noted that such tasks include aggregating the results of studying “elementary” processes in clouds and studying the role of systemic properties of clouds in the formation of macro- and microstructural characteristics of clouds. The state of research on the development of numerical models of convective clouds, within which the aggregation of “elementary” processes in clouds is carried out, is touched upon. As for the study of the role of the system properties of clouds in the formation of their macro- and microstructural characteristics, the study of the role of the interaction of clouds with the atmosphere surrounding them (the property of the hierarchy of systems) and the interaction of processes in clouds, which are the most important structure-forming factors for clouds, seems to be the most important and difficult task in this area of research. Methods and some results of research in this direction are presented, which confirm the significant role of these factors in the formation and development of clouds, in the formation of their macro- and microstructural characteristics.KeywordsConvective cloud physicsDirections of developmentThe role of system propertiesResearch results
November 2022
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3 Reads
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1 Citation
Russian Meteorology and Hydrology
October 2022
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6 Reads
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1 Citation
Russian Meteorology and Hydrology
August 2022
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3 Reads
Meteorologiya i Gidrologiya
The results of numerical experiments with the three-dimensional nonstationary bin model of convective clouds with a detailed consideration of hydrothermodynamic, microphysical, and electrical processes are presented. The structure of the cloud is investigated at different time moments for comparison with radar and lightning location observations in the North Caucasus. The possibility is analyzed of improving the quality of processing and interpretation of simulation and observation data on deep convective (with thunderstorm and hail) clouds using the developed three-dimensional visualization software.
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... Ряд работ посвящен численному моделированию конвективного облака в различных регионах. В [Lesev et al., 2021] представлена трехмерная модель конвективного облака с учетом электрических процессов. Исследованы новые аспекты механизма формирования электрического заряда и поля в облаках. ...
June 2021
JP Journal of Heat and Mass Transfer
... The system of equations (5)-(9) was solved by the method of componentwise splitting (see [6]). In creation of the information systems for the meteorological and the environmental safety, the models of this level are the only available source of the detailed quantitative analysis of the situation of the real picture of the distribution of meteorological parameters (see [15]). ...
March 2021
Journal of Mathematical Sciences
... These defects affect the mechanical properties of structures and materials [1]. In the aviation field, when an aircraft flies through a cloud filled with supercooled droplets [2], abrupt crystallization occurs on local surfaces, such as airfoils, engines, and probes [3,4]. Therefore, from the perspectives of science and engineering, it is important to develop a mathematical theory to describe the dynamics of crystallization. ...
April 2018
Journal of Environmental Management and Tourism
... In the present work, the quantitative and optical investigations use eBC to describe the BC aerosols. The complex microphysical features are also subject to dynamic changes over the course of time and space (Shapovalov et al. 2018). ...
January 2018
Natural Science
... Research shows that in thunderstorm weather, the charge carried by the clouds will keep increasing, and the atmospheric EF will change abnormally [14]. When charges keep gathering to reach a certain threshold, the discharge phenomenon between clouds or between clouds and ground will occur, which is called lightning. ...
May 2017
Proceedings of SPIE - The International Society for Optical Engineering
... Observatories from different regions of the world describe their experience in organizing AEF observations. The authors of [6] present the development of methods and means for recording lightning electricity in the North Caucasus, Russia. The authors of [7] describe the history of the formation and organization of AEF observations at the Nagycenk Geophysical Observatory, Hungary, Central Europe. ...
March 2016
Russian Meteorology and Hydrology
... In this case, the proportionality coefficient depends on the temperature of the growing particle, as well as on the concentration and chemical composition of impurities in the cloud water and takes a value from 10 -10 to 10 -8 C/g. The formation of microscopic fragments during freezing of droplets is taken into account as follows [7]: ...
April 2014
Radiophysics and Quantum Electronics