Evgeny Mareev - Academia.edu (original) (raw)

Papers by Evgeny Mareev

XXVIII Международный симпозиум «Оптика атмосферы и океана. Физика атмосферы»

Работа посвящена определению влияния аэрозолей на параметры грозовых облаков. Проведено сравнение... more Работа посвящена определению влияния аэрозолей на параметры грозовых облаков. Проведено сравнение численных расчетов с использованием модели WRF-ARW и параметризации микрофизики без учёта и с учётом аэрозолей на примере грозовых событий Нижегородской области. Выполнено сравнение данных моделирования радиолокационной отражаемости с данными метеорадара. По результатам моделирования проведен анализ изменения индекса доступной потенциальной энергии во время грозового события. Выявлены следующие особенности: при учёте аэрозолей увеличивается площадь, занимаемая конвективным событием, а также смещается во времени пик конвективной активности. Таким образом, при мезомасштабном моделировании динамики атмосферы и моделировании процессов электризации учёт аэрозолей имеет большое значение.

Figures of our submission to Journal of Geophysical Research - Atmospheres (Advanced numerical mo... more Figures of our submission to Journal of Geophysical Research - Atmospheres (Advanced numerical model of lightning development: Application to studying the role of LPCR in determining lightning type, Paper # 2016JD026261RR).

Journal of Atmospheric and Solar-Terrestrial Physics, 2019

Izvestiya, Atmospheric and Oceanic Physics, 2016

Radiophysics and Quantum Electronics, 2011

Recent measurements show that a mesospheric electric discharge (sprite) can provoke disturbances ... more Recent measurements show that a mesospheric electric discharge (sprite) can provoke disturbances in the chemical composition of the mesosphere. In this paper, we propose a plasmachemical system of equations which allows one to describe the complex relationship among chemical components during the discharge. Disturbances of the mesospheric ion composition are analyzed under the night-time and daytime conditions at an altitude of 75 km, which is typical of the sprite initiation and at an altitude of 85 km where the diffuse region of discharge is usually observed. The most probable scenarios of development of the electric-field and electron-temperature disturbances, which are characteristic of the diffusive and streamer regions of the sprite, are simulated. The value and characteristic time of disturbances of the main ion components (O2+, NO+, H3O+, H5O2+, and N2+) are evaluated. The obtained values of the electron-density disturbances are in agreement with experimental and theoretical data. It was established that the sprite series, which are recorded over the vast stratified regions of mesoscale convection systems, can lead to generation of comparatively long-lived disturbances in the ion composition of mesospheric plasma.

Radiophysics and Quantum Electronics, 2014

ABSTRACT A series of features of the spectral characteristics of thunderstorm-cloud field perturb... more ABSTRACT A series of features of the spectral characteristics of thunderstorm-cloud field perturbations is specified on the basis of long-term ground-based measurements of the electric field at remote locations. A significant increase in the spectral density of the electric-field variations during the thunderstorm has been observed. Maximum increase due to the pulsed field component, which is related to the lightning discharges, is observed in the fluctuation-period range from tens of seconds to several minutes. A significant increase is also observed in the range 0.5–1.5 mHz (10–30-min periods) in which the spectral density is increased by more than a factor of 104, whereas the increase factor at the lower frequencies is equal to 100 (about 10 times for the field). Quasimonochromatic components (with 10–20-min periods) in the frequency fluctuation spectra of an electric field of the powerful thunderstorm clouds, which drift by frequency at the cloud initiation, maturity, and dissipation stages are found. It is shown that presentation of the sequence of the pulsed field perturbations related to the discharges in the form of a pulse flow with independent intervals (Poisson flow) agrees with the form of the fluctuation spectrum of the observed field and leads to an estimate of 10 s for the average relaxation (regeneration) time of the field in the thunderstorm-cloud vicinity after the discharge.

Uspekhi Fizicheskih Nauk, 2010

Atmosphere

An increase in the frequency of atmospheric hazards in a changing climate has attracted interest ... more An increase in the frequency of atmospheric hazards in a changing climate has attracted interest in the study of regional features of mesoscale convective systems and trends of lightning activity. Severe convective storms are the most destructive weather events causing substantial damage and fatalities. In this paper, we analyze general trends in the lightning activity in the Upper Volga region and identify the particular features of a severe thunderstorm on 13–14 July 2020. The analysis of the annual variability of the lightning activity in the Upper Volga region, carried out according to the World-Wide Lightning Location Network (WWLLN) data, has shown that the total number of discharges during the convective seasons of 2016–2021 increased. For the convective season of 2020, the daily number of discharges in the neighborhood of Nizhny Novgorod (the center of the region) is calculated according to the WWLLN data and the electric field mill (EFM) measurements. It is revealed that th...

&lt;p&gt;Lightning activity is predicted to increase with global warming, though ... more &lt;p&gt;Lightning activity is predicted to increase with global warming, though estimates of lightning sensitivity to a change of temperature vary widely.&amp;#160; Since lightning is a small scale process, it must be represented by parameterizations in climate models. This paper uses large-scale meteorological parameters tied to thunderstorm generation to improve existing empirical models that simulate regional thunderstorm behavior. This study focuses on Tropical America, and uses the ERA5 higher resolution reanalysis data (ERA5) to develop our empirical model.&amp;#160; Thunderstorm data were taken from the World Wide Lightning Location Network (WWLLN) and processed using the clustering algorithm developed by Mezuman et al. (2014). The two meteorological parameters that correlated best with thunderstorm clusters in Tropical America were specific humidity (SH) and convective available potential energy (CAPE).&amp;#160; The resulting empirical model was run from 1979-2019 using ERA5 reanalysis data as input. This approach enables the observation of long-term trends in the behavior of thunderstorms in the regions, in the absence of a complete historical lightning record. To our surprise, Tropical American thunderstorms exhibited a negative trend over this period, with a ~8% decrease in thunderstorm clusters since the 1980s even with a rise of 1K in temperature over the same period. The regions of largest decreases in thunderstorm activity align well with estimates of deforestation.&amp;#160; We estimate that for every 1 Tg C lost due to deforestation, there is a 10% decrease in thunderstorm number.&lt;/p&gt;

Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia, National Researc... more Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia, National Research Nuclear University MEPhI, Moscow, Russia, Deptment of Electronic and Electrical Engineering, University of Bath, Bath, United Kingdom, Deptment of Environmental Engineering, Democritus University of Thrace, Xanthi, Greece, Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia

27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2021

Short-term (∆f ≅ 10–1 Hz) electric field pulsations have been measured in the surface atmospheric... more Short-term (∆f ≅ 10–1 Hz) electric field pulsations have been measured in the surface atmospheric layer during 1999 and 2001 under fair-weather conditions. At the frequencies 10–1 Hz these pulsations have a power-law spectrum with the spectral index varying in the range from -1.23 to -3.36 while the most probable values of the index fall into the range from -2.25 to -3.0, unlike the temperature fluctuation spectra which obey in the inertial subrange the Kolmogorov power law with the spectral index close to –5/3. Remote sensing of aeroelectric pulsations with a changeable inter-sensor distance allowed us to study the relation between the power indexes of structure functions and spectra decay slopes for respective aeroelectric structures. Approximation of the latter by linear function αS = αD + С has revealed αS10 = αD10 + 1,85 and αS3 = αD3 + 1,79 for the 10-m (energy-supply) and 3-m sub-ranges of the inertial interval of aeroelectrical turbulence. INTRODUCTION Two classical problems...

&amp;lt;p&amp;gt;A problem of the electric field dynamics in turbulent electro-ac... more &amp;lt;p&amp;gt;A problem of the electric field dynamics in turbulent electro-active clouds (Cumulus, Stratus, Cumulonimbus) is one of the most relevant and complex problems of dynamical meteorology and atmospheric electricity. This problem is important for the study of intense large-scale electric field and its fluctuations that may lead to high-energy particle flows and lightning discharges, for electric current parameterization. Direct field measurements in convective clouds with a developed electrical structure are very difficult; so one of urgent tasks is the development of remote sensing methods for turbulence characteristics in electro-active clouds.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;The growth of a large-scale electric field in a turbulent atmosphere is caused by the generation of an electric charge on colliding particles (hydrometeors and dust). Meanwhile, observations (including preliminary observations of the authors) and theoretical studies (Mareev and Dementyeva, 2017) show that intensification of thunderstorm activity can be associated with increased turbulence in the cloud. This paper presents new ideas and results of experimental and theoretical studies of the role of turbulence in electro-active clouds.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;The main attention is paid to complex remote observations of different types of clouds with an experimental set-up including the microwave radiometers of 3 cm and 8 mm wavelengths (with a time resolution of order of one second), the network of electrostatic fluxmeters spaced by several kilometers each from another, and the meteorological radar. The data of recent several years were used for analysis. Note that recently space-borne passive microwave radiometry of intense convective clouds (see, for example, Peterson et al., 2017) attracted more attention compared to ground-based microwave observations. A principal idea of our approach is to use the wave-length channels allowing us to reveal both optically thick and optically transparent cloud events from the data on fluctuations in the brightness temperature of the atmosphere.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;A special attention was paid to comparative analysis of the turbulence characteristics in thunderclouds and in clouds that do not have a developed electrical structure. The spectral characteristics of electric field and brightness fluctuations were found to be associated with atmospheric air turbulence and mostly are quantitatively described by Kolmogorov-type spectra. Compared with ordinary Cumulus and Stratus clouds, a limited band near a frequency of ~ 0.01 Hz with a higher level of fluctuations is distinguished in the spectral density of fluctuations in the brightness temperature of thunderclouds. The spectra of fluctuations of the electric field caused by thunderclouds, as well as turbulence interior thundercloud, are significantly different from the spectra caused by ordinary Cumulus and layered clouds.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;The work was supported by the Russian Foundation for Basic Research (projects no. 19-05-00975 and 18-45-520010).&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;References&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;Mareev E.A., Dementyeva S.O. (2017), The role of turbulence in thunderstorm, snowstorm, and dust storm electrification. Journal of Geophysical Research: Atmospheres, V. 122, No. 13, P. 6976-6988. doi: 10.1002/2016JD026150.&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;Peterson M., Liu C., Mach D., Deierling W., Kalb C. (2015), A method of estimating electric fields above electrifi_ed clouds from passive microwave observations. J. Atmos. Ocean. Tech., V.32 (8), P.1429-1446. doi: 10.1175/ JTECH-D-14-00119.1.&amp;lt;/p&amp;gt;

The electrical properties of the fog are described in detail on the basis of full-scale aeroelect... more The electrical properties of the fog are described in detail on the basis of full-scale aeroelectrical observations and theoretical modeling. The measured electric field and spectrum of its pulsations are given along with the simultaneous amplitude–time series of the vertical component of electric field and electric current. Fog is shown to increase the intensity of electric field pulsations by more than an order of magnitude. Nevertheless, in the majority of observations, the exponent of the spectrum does not differ drastically from the spectrum exponents typical for fair-weather conditions. The results of structure–time analysis offer the possibility of specifying two types of electrical states of fog: one is characterized by aeroelectric structure generation and another, by chaotic structure–time variations. Possible mechanisms of electric-field profiles and spectra formation are discussed with allowance for fog-particle charging, neutral gas turbulence and aeroelectric structure...

Two alternative approaches to the description of thunderstorms in models of the global electric c... more Two alternative approaches to the description of thunderstorms in models of the global electric circuit (GEC) are considered, one treating thunderstorms as current sources, and the other, as voltage sources; it is shown that the two approaches are equally convenient in simple equivalent circuit models of the GEC, but in more realistic continuous three-dimensional spherical models the current-source approach proves more natural and useful. Within the current-source approach a number of simple model problems are analysed so as to illustrate the effect of conductivity inhomogeneities on the ionospheric potential; it is shown that taking account of the conductivity reduction inside thunderclouds leads to a substantial increase in the ionospheric potential, while the increase of conductivity above thunderstorms does not lead to a significant change in the ionospheric potential. The two approaches to the description of generators of the GEC are compared from the perspective of the ionosph...

An extensive database obtained after long-term ground-based aero-electrical and magnetic measurem... more An extensive database obtained after long-term ground-based aero-electrical and magnetic measurements at the Geophysical Observatory “Borok”, enables a unique insight into the main components of the global electric circuit and their interconnection from the middle-latitude observation point. Data analysis allows us to describe the global electric circuit as an aggregation of structures with different spatio-temporal scales, including aeroelectric structures, thunderstorms, and synoptic-scale structures. The results of simultaneous observation of aeroelectric and geomagnetic fields during magnetic storm conditions are presented to illustrate strong coupling of different-scale phenomena in the global circuit. INTRODUCTION Over the recent decade many efforts have been undertaken both in observation and theoretical modeling providing substantial progress in understanding the global circuit. According to its classical definition, the global electrical circuit represents the current conto...

Atmospheric Research, 2021

Abstract It is known that the global electric circuit (GEC) intensity can be characterised by a s... more Abstract It is known that the global electric circuit (GEC) intensity can be characterised by a single global index, namely the ionospheric potential (IP), made up of contributions from electrified clouds all over the globe. Using the Weather Research and Forecasting model, we have reproduced the atmospheric dynamics for 2008–2018 and simulated the variation of the GEC by parameterising regional contributions to the IP in terms of convection and precipitation. Considering that the El Nino—Southern Oscillation (ENSO) can be quantitatively characterised by sea surface temperatures (SSTs) in the Nino 3.4 region, this allowed us to identify and study in detail the effect of ENSO on regional contributions to the GEC. Our simulations have shown that contributions to the GEC from the land and oceanic parts of the Earth's surface respond oppositely to the ENSO cycle. The oceanic contribution is positively correlated with the Nino 3.4 SST, largely owing to increases in convection over the Pacific Ocean. In contrast to the oceans, the land contribution shows a negative correlation with ENSO due to decreases in convection over the Maritime Continent and South America. The observed correlations are statistically significant and are clearly seen on the decadal timescale; at the same time contributions to the IP for individual years do not always clearly reflect the corresponding Nino 3.4 SST anomalies. During the two El Ninos and two La Ninas that occurred between 2008 and 2018, the oceanic contribution always changed in phase with ENSO, increasing in El Nino years and decreasing in La Nina years; on the other hand, the contribution of land showed a clear variation in antiphase with ENSO only for the 2015/16 El Nino and 2010/11 La Nina, characterised by extremely large SST anomalies, with a small and indefinite effect for the two lesser events. When summing the contributions of land and ocean, two strong effects of opposite signs nearly counterbalance each other and we obtain a much less pronounced effect of ENSO on the total IP. This effect is generally positive since land and ocean provide nearly equal contributions to the GEC during Northern Hemisphere winters and, according to our analysis, the contribution of ocean is slightly more sensitive to ENSO than that of land.

Atmospheric Research, 2017

We consider the relations between the mixed layer height and atmospheric electric parameters affe... more We consider the relations between the mixed layer height and atmospheric electric parameters affected by convective mixing. Vertical turbulent transport of radon, its progeny and electrically charged particles is described under Lagrangian stochastic framework, which is the next step to develop a consistent model for the formation of electrical conditions in the atmospheric boundary layer. Using the data from detailed and complex measurements of vertical profiles of the temperature and turbulence statistics as input, we calculated non-stationary vertical profiles of radon and its daughter products concentrations, atmospheric electric conductivity and intensity of electric field in the convective boundary layer from the morning transition through early afternoon quasi-stationary conditions. These profiles demonstrate substantial variability due to the changing turbulent regime in the evolving boundary layer. We obtained quantitative estimates of the atmospheric electric field variability range essentially related to the sunrise and convection development. It is shown that the local change in the electrical conductivity is the only factor that can change the intensity of electric field at the earth's surface more than twice during the transition from night to day. The established relations between electric and turbulent parameters of the boundary layer indicate that the effect of sunrise is more pronounced in the case when development of convection is accompanied by an increase in aerosol concentration and, hence, a decrease in local conductivity.

Radiophysics and Quantum Electronics, 2005

2011 XXXth URSI General Assembly and Scientific Symposium, 2011