Svetlana Terpugova - Profile on Academia.edu (original) (raw)
Papers by Svetlana Terpugova
Condensation activity of atmospheric aerosol particles of different size as assessed from the data of an optical counter
Оптика атмосферы и океана, 2021
Russian Meteorology and Hydrology, Feb 1, 2016
The results of numerical simulation of downward solar radiation fluxes for background and smoke-c... more The results of numerical simulation of downward solar radiation fluxes for background and smoke-contaminated atmospheric conditions are discussed. Vertical profiles of aerosol characteristics are obtained from the empirical model based on the data of aircraft sounding of profiles of angular scattering coefficients and content of absorbing particles in the lower troposphere. The background model was created using the results of measurements obtained under cloudless and mostly cloudless atmospheric conditions in 1999-2011. Optical parameters of smoke aerosol are determined from the data of aircraft measurements in the period of long-term wildfires in Siberia in the summer 2012. It is demonstrated that deficiency in diurnal values of total solar radiation at the surface level caused by the formation of the optically dense smoke layer as compared to background conditions, is more than 13 MJ/m 2 .
Diurnal behavior of aerosol hygro- and thermooptical parameters in the atmosphere of Tomsk region
To study the diurnal behavior of hygro- and thermooptical parameters, the cycles of intensive mea... more To study the diurnal behavior of hygro- and thermooptical parameters, the cycles of intensive measurements with artificial humidification and heating of the aerosol under study were carried out four to six times a day. The parameter of condensation activity γ characterizes variability of the aerosol scattering coefficient under the change of the relative humidity of air, and the thermooptical parameters are determined by the decrease of the volume concentration of particles in the respective temperature range. Diurnal behavior of the parameter of condensation activity is the most pronounced in spring. Its characteristic peculiarities are maximum in the daytime (~ 3 pm) and minimum in the evening (~10 pm). Diurnal behavior of the parameter determining the aerosol fraction evaporated in the temperature range 100 – 250°C also is well pronounced.
Atmospheric Chemistry and Physics, Aug 11, 2014
We conducted long-term network observations using standardized Multi-Axis Differential optical ab... more We conducted long-term network observations using standardized Multi-Axis Differential optical absorption spectroscopy (MAX-DOAS) instruments in Russia and ASia (MADRAS) from 2007 onwards and made the first synthetic data analysis. At seven locations (Cape Hedo, Fukue and Yokosuka in Japan, Hefei in China, Gwangju in Korea, and Tomsk and Zvenigorod in Russia) with different levels of pollution, we obtained 80 927 retrievals of tropospheric NO 2 vertical column density (TropoNO2VCD) and aerosol optical depth (AOD). In the technique, the optimal estimation of the TropoNO2VCD and its profile was performed using aerosol information derived from O 4 absorbances simultaneously observed at 460-490 nm. This large data set was used to analyze NO 2 climatology systematically, including temporal variations from the seasonal to the diurnal scale. The results were compared with Ozone Monitoring Instrument (OMI) satellite observations and global model simulations. Two NO 2 retrievals of OMI satellite data (NASA ver. 2.1 and Dutch OMI NO 2 (DOMINO) ver. 2.0) generally showed close correlations with those derived from MAX-DOAS observations, but had low biases of up to ∼ 50 %. The bias was distinct when NO 2 was abundantly present near the surface and when the AOD was high, suggesting a possibility of incomplete accounting of NO 2 near the surface under relatively high aerosol conditions for the satellite observations. Except for constant biases, the satellite observations showed nearly perfect seasonal agreement with MAX-DOAS observations, suggesting that the analysis of seasonal features of the satellite data were robust. Weekend reduction in the TropoNO2VCD found at Yokosuka Published by Copernicus Publications on behalf of the European Geosciences Union. 7910 Y. Kanaya et al.: Long-term MAX-DOAS network observations of NO 2 in Russia and Asia and Gwangju was absent at Hefei, implying that the major sources had different weekly variation patterns. While the TropoNO2VCD generally decreased during the midday hours, it increased exceptionally at urban/suburban locations (Yokosuka, Gwangju, and Hefei) during winter. A global chemical transport model, MIROC-ESM-CHEM (Model for Interdisciplinary Research on Climate-Earth System Model-Chemistry), was validated for the first time with respect to background NO 2 column densities during summer at Cape Hedo and Fukue in the clean marine atmosphere.
XXVIII Международный симпозиум «Оптика атмосферы и океана. Физика атмосферы», Jun 22, 2022
На основе анализа наблюдений 24-летнего ряда параметра конденсационной активности аэрозоля в приз... more На основе анализа наблюдений 24-летнего ряда параметра конденсационной активности аэрозоля в приземном слое атмосферы г. Томска выявлено, что наиболее значимые его изменения наблюдаются в годовом ходе. Также обнаружены более медленные колебания с периодом 6-7 лет.
Main cycles of variability of the aerosol condensation activity in Tomsk in 1998 - 2021
28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, Dec 8, 2022
Estimation of urban contribution into variability of the aerosol characteristics in the near-ground atmospheric layer in Tomsk region
IOP conference series, Nov 27, 2020
The paper presents the results of monitoring the aerosol characteristics in the near-ground layer... more The paper presents the results of monitoring the aerosol characteristics in the near-ground layer of the atmosphere at the Aerosol Station of the Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Sciences (IOA SB RAS) located at the southeastern outskirts of city of Tomsk and in the background forest area (the Fonovaya Observatory, ∼ 70 km to southwest from Tomsk) in 2014 – 2018. The data were considered on the concentration of aerosol and absorbing substance (soot, black carbon) at two measurement points, as well as the hygroscopic properties of aerosol particles. The features of the annual behavior and interannual variability of the anthropogenic contribution of the city to the average values of aerosol characteristics are analyzed. A significant trend by 7% per year was revealed for an increase in the soot fraction of aerosol under urban conditions. The typical diurnal behavior of the aerosol and soot concentrations at the Aerosol station is characterized by an increase in these parameters at 21-23 hours local time compared to daytime hours. Also a significant decrease in the aerosol hygroscopicity is observed in evening under urban conditions.
Technique for determination of the single scattering albedo of submicron aerosol in the approximation of lognormal size distribution of black carbon
Proceedings of SPIE, Nov 29, 2016
The technique and results of calculation of spectral dependence of the single scattering albedo (... more The technique and results of calculation of spectral dependence of the single scattering albedo (SSA) of submicron aerosol in the visible spectral region with allowance for the lognormal size distribution of absorbing matter (black carbon) are presented. The ranges of albedo variations are estimated, and peculiarities of spectral behavior and variability of SSA are studied as functions of the median radius and the halfwidth of BC size distribution for dry and wet particles in the summer period. The generalized parameter of the coarseness of BC size distribution is proposed, which takes into account simultaneously the influence of the median radius and the halfwidth. It allows good approximation of the SSA dynamics as a function of the BC size distribution parameters for dry particles by a linear dependence.
Optical-Microphysical Model of Tropospheric Aerosol Over West Siberia
Journal of Aerosol Science, Sep 1, 2001
Study of the role of particles of different size in the aerosol condensation activity by the method of diffusion selection
27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, Dec 16, 2021
When studying the condensation growth of atmospheric aerosol, many researchers note the dependenc... more When studying the condensation growth of atmospheric aerosol, many researchers note the dependence of the hygroscopic properties on the particle size. To change the aerosol size spectrum, we use diffusion selection, i.e. sequential removal of the finest fraction from the air flow. This makes it possible, on the one hand, to more accurately describe the distribution function in the size range r <0.2 μm, and, on the other hand, to increase the contribution of the intermediately dispersed fraction (r = 0.5 - 1 μm) to the formation of the optical signal. This work is devoted to the study of the sensitivity of the parameter of condensation activity of particles to changes in their size spectrum.
Journal of Aerosol Science, Jul 1, 2004
Atmospheric and Oceanic Optics, 2018
We present the quantitative estimates of the vertical distribution of absorbed solar radiation an... more We present the quantitative estimates of the vertical distribution of absorbed solar radiation and temperature effects in the background and extremely smoke-laden troposphere of Siberia, obtained using empirical data and numerical simulation. Vertical profiles of the aerosol characteristics are created based on an empirical model, relying on aircraft sensing of angular scattering coefficients and the content of absorbing particles at different altitudes. It is shown that, under the smoke-haze conditions, the radiation effect of aerosol particles with high black carbon content on the diurnal influx of solar radiation in the central part of the smoke layer exceeds 50%. The change in air temperature due to the absorption of solar radiation during the daylight hours is approximately 2.5-5.5 K when the optical depth of the smoke aerosol varies in the range 2 ≤ τ smoke (0.55 μm) ≤ 4.
SPIE Proceedings, Nov 30, 2006
Different techniques for determination of the height of the aerosol mixing layer are considered. ... more Different techniques for determination of the height of the aerosol mixing layer are considered. Seasonal behaviors of the heights of homogeneous atmosphere and submicron aerosol mixing layer are studied. It is revealed that in summer the height of the homogeneous aerosol atmosphere and the height of the mixing layer of submicron particles practically coincide with each other, while in winter
Restructuring submicron aerosol size spectrum in early spring period
Proceedings of SPIE, Nov 25, 2014
The conditions of variability of the submicron fraction of near-surface atmospheric aerosol with ... more The conditions of variability of the submicron fraction of near-surface atmospheric aerosol with radii 0,3 ÷ 0,6 microns in transitional winter-spring period in the experiments carried out on aerosol station LOA IAO SB RAS in 2009-2013 are considered. A relationship between variations of the concentration of particles and submicron aerosol condensation activity is investigated.
Relationship of the aerosol condensation activity with concentration of particles in the nanometer size range
28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, Dec 8, 2022
Lëd i Sneg, May 11, 2016
Chemical composition of aerosol in the ground layer of the coastal zone in East Antarctica is ana... more Chemical composition of aerosol in the ground layer of the coastal zone in East Antarctica is analyzed in the article. The aerosol samples were taken in 2006-2015 during seasonal works of the Russian Antarctic Expeditions (RAE), namely, these were 52 nd -53 rd , 55 th , and 58 th -60 th expeditions. Samples were taken in the 200-km band of the sea-shore zone along routes of the research vessels (REV) «Akademik Fedorov» and «Akademik Treshnikov» as well as on territories of the Russian stations Molodezhnaya and Mirny. Although the results obtained did show the wide range of the aerosol concentrations and a certain variability of their chemical composition, some common features of the variability were revealed. Thus, during the period from 2006 to 2014 a decrease of average values of the sums were noted. Spatially, a tendency of decreasing of the ion concentrations was found in the direction from the station Novolazarevskaya to the Molodezhnaya one, but the concentrations increased from the Molodezhnaya to the station Mirny. The sum of ions of the aerosol in the above mentioned coastal zone was, on the average, equal to 2.44 µg/m 3 , and it was larger than that on the territory of the Antarctic stations Molodezhnaya (0,29 µg/m 3 ) and Mirny (0,50 ág / m 3 ). The main part to the sum of the aerosol ions on the Antarctic stations was contributed by Na + , Ca 2+, Cl -, SO 4 2-. The main ions in aerosol composition in the coastal zone are ions Na + and Cl -. The dominant contribution of the sea salt and SO 4 2-can be traced in not only the composition of atmospheric aerosols, but also in the chemical composition of the fresh snow in the coastal areas of East Antarctica: at the Indian station Maitri, on the Larsemann Hills, and in a boring located in 55.3 km from the station Progress (K = 1.4÷6.1). It was noted that values of the coefficient of enrichment K of these ions decreases as someone moves from a shore to inland. Estimation of contributions of the continental and maritime factors to formation of the aerosol chemical composition revealed higher enrichment ratios for K + , Ca 2+ , SO 4 2-(K = 3.6÷13.0). This reflects not only influence of the natural sources, but the intensity of human activities on the Antarctic continent as well. The elemental composition of solid aerosols was also analyzed. The largest concentrations were determined for Zn, Al and Fe. The ratio of concentration of the elements in both the soluble and insoluble phases of the aerosol showed that 84.1% of the total amount of the elements was contained in a water-insoluble state. Fractional relation between the element concentrations changed in different phases from 16 to 98%. High enrichment of the aerosol particles by Zn, Cu, Cr, Ba, Pb, Ni, Se, As, Cd (the enrichment factors = 27÷26 445) had been revealed. The content of dominant chemical components (Na + , Cl -, Zn, Fe), factors and coefficients of the element enrichment in the aerosols as well as in fresh snow of the coastal zone of East Antarctica are indicative of the identity of sources where their composition is formed.
Seasonal variations of anthropogenic contribution into diurnal behavior of the aerosol and soot mass concentrations and the aerosol hygroscopicity in the suburb of Tomsk
A comparative analysis of the seasonal mean diurnal behavior of aerosol characteristics was carri... more A comparative analysis of the seasonal mean diurnal behavior of aerosol characteristics was carried out using the monitoring data in the suburban area of Tomsk and in the background region in 2013-2019. It is revealed that the greatest contribution of anthropogenic sources to the diurnal variation of the concentrations of submicron aerosol and soot is observed in winter during their evening maximum at 8–9 p.m. The minimum urban load on these aerosol characteristics was detected in summer at 1–2 p.m. During the evening maximum of the aerosol and soot concentrations, a decrease in the parameter of condensation activity is observed in Tomsk compared to the background region.
Relations between the aerosol optical characteristics measured on a near-ground long path and in a local volume of air
The aerosol extinction coefficients in the wavelength range from 0.45 to 3.9 μm measured on a lon... more The aerosol extinction coefficients in the wavelength range from 0.45 to 3.9 μm measured on a long horizontal path are compared with optical parameters measured in the visible wavelength range in a local air volume. The following parameters were analyzed: “dry” and “wet” angular scattering coefficients at an angle of 45°, as well as the mass concentration of the absorbing substance (“soot”) in aerosol particles. Round-the-clock measurements were carried out from March till November in 2000-2006. The comparison was carried out for three seasons: spring, summer, fall and four types of aerosol weather: “, background”, “haze”, “smog” and “smoke haze”. The role of each factor in extinction of optical radiation at different wavelengths is revealed.
XXVIII Международный симпозиум «Оптика атмосферы и океана. Физика атмосферы»
При изучении конденсационного роста атмосферного аэрозоля многими исследователями отмечается зави... more При изучении конденсационного роста атмосферного аэрозоля многими исследователями отмечается зависимость гигроскопических свойств от размера частиц. В данной работе на примере тестовых измерений рассмотрена связь параметра конденсационной активности со средним радиусом ансамбля аэрозольных частиц и объемной долей фракций d < 200 нм и d = 500 – 1000 нм. Ввиду небольшого массива данных результаты являются предварительными.
Condensation activity of atmospheric aerosol particles of different size as assessed from the data of an optical counter
Оптика атмосферы и океана, 2021
Russian Meteorology and Hydrology, Feb 1, 2016
The results of numerical simulation of downward solar radiation fluxes for background and smoke-c... more The results of numerical simulation of downward solar radiation fluxes for background and smoke-contaminated atmospheric conditions are discussed. Vertical profiles of aerosol characteristics are obtained from the empirical model based on the data of aircraft sounding of profiles of angular scattering coefficients and content of absorbing particles in the lower troposphere. The background model was created using the results of measurements obtained under cloudless and mostly cloudless atmospheric conditions in 1999-2011. Optical parameters of smoke aerosol are determined from the data of aircraft measurements in the period of long-term wildfires in Siberia in the summer 2012. It is demonstrated that deficiency in diurnal values of total solar radiation at the surface level caused by the formation of the optically dense smoke layer as compared to background conditions, is more than 13 MJ/m 2 .
Diurnal behavior of aerosol hygro- and thermooptical parameters in the atmosphere of Tomsk region
To study the diurnal behavior of hygro- and thermooptical parameters, the cycles of intensive mea... more To study the diurnal behavior of hygro- and thermooptical parameters, the cycles of intensive measurements with artificial humidification and heating of the aerosol under study were carried out four to six times a day. The parameter of condensation activity γ characterizes variability of the aerosol scattering coefficient under the change of the relative humidity of air, and the thermooptical parameters are determined by the decrease of the volume concentration of particles in the respective temperature range. Diurnal behavior of the parameter of condensation activity is the most pronounced in spring. Its characteristic peculiarities are maximum in the daytime (~ 3 pm) and minimum in the evening (~10 pm). Diurnal behavior of the parameter determining the aerosol fraction evaporated in the temperature range 100 – 250°C also is well pronounced.
Atmospheric Chemistry and Physics, Aug 11, 2014
We conducted long-term network observations using standardized Multi-Axis Differential optical ab... more We conducted long-term network observations using standardized Multi-Axis Differential optical absorption spectroscopy (MAX-DOAS) instruments in Russia and ASia (MADRAS) from 2007 onwards and made the first synthetic data analysis. At seven locations (Cape Hedo, Fukue and Yokosuka in Japan, Hefei in China, Gwangju in Korea, and Tomsk and Zvenigorod in Russia) with different levels of pollution, we obtained 80 927 retrievals of tropospheric NO 2 vertical column density (TropoNO2VCD) and aerosol optical depth (AOD). In the technique, the optimal estimation of the TropoNO2VCD and its profile was performed using aerosol information derived from O 4 absorbances simultaneously observed at 460-490 nm. This large data set was used to analyze NO 2 climatology systematically, including temporal variations from the seasonal to the diurnal scale. The results were compared with Ozone Monitoring Instrument (OMI) satellite observations and global model simulations. Two NO 2 retrievals of OMI satellite data (NASA ver. 2.1 and Dutch OMI NO 2 (DOMINO) ver. 2.0) generally showed close correlations with those derived from MAX-DOAS observations, but had low biases of up to ∼ 50 %. The bias was distinct when NO 2 was abundantly present near the surface and when the AOD was high, suggesting a possibility of incomplete accounting of NO 2 near the surface under relatively high aerosol conditions for the satellite observations. Except for constant biases, the satellite observations showed nearly perfect seasonal agreement with MAX-DOAS observations, suggesting that the analysis of seasonal features of the satellite data were robust. Weekend reduction in the TropoNO2VCD found at Yokosuka Published by Copernicus Publications on behalf of the European Geosciences Union. 7910 Y. Kanaya et al.: Long-term MAX-DOAS network observations of NO 2 in Russia and Asia and Gwangju was absent at Hefei, implying that the major sources had different weekly variation patterns. While the TropoNO2VCD generally decreased during the midday hours, it increased exceptionally at urban/suburban locations (Yokosuka, Gwangju, and Hefei) during winter. A global chemical transport model, MIROC-ESM-CHEM (Model for Interdisciplinary Research on Climate-Earth System Model-Chemistry), was validated for the first time with respect to background NO 2 column densities during summer at Cape Hedo and Fukue in the clean marine atmosphere.
XXVIII Международный симпозиум «Оптика атмосферы и океана. Физика атмосферы», Jun 22, 2022
На основе анализа наблюдений 24-летнего ряда параметра конденсационной активности аэрозоля в приз... more На основе анализа наблюдений 24-летнего ряда параметра конденсационной активности аэрозоля в приземном слое атмосферы г. Томска выявлено, что наиболее значимые его изменения наблюдаются в годовом ходе. Также обнаружены более медленные колебания с периодом 6-7 лет.
Main cycles of variability of the aerosol condensation activity in Tomsk in 1998 - 2021
28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, Dec 8, 2022
Estimation of urban contribution into variability of the aerosol characteristics in the near-ground atmospheric layer in Tomsk region
IOP conference series, Nov 27, 2020
The paper presents the results of monitoring the aerosol characteristics in the near-ground layer... more The paper presents the results of monitoring the aerosol characteristics in the near-ground layer of the atmosphere at the Aerosol Station of the Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Sciences (IOA SB RAS) located at the southeastern outskirts of city of Tomsk and in the background forest area (the Fonovaya Observatory, ∼ 70 km to southwest from Tomsk) in 2014 – 2018. The data were considered on the concentration of aerosol and absorbing substance (soot, black carbon) at two measurement points, as well as the hygroscopic properties of aerosol particles. The features of the annual behavior and interannual variability of the anthropogenic contribution of the city to the average values of aerosol characteristics are analyzed. A significant trend by 7% per year was revealed for an increase in the soot fraction of aerosol under urban conditions. The typical diurnal behavior of the aerosol and soot concentrations at the Aerosol station is characterized by an increase in these parameters at 21-23 hours local time compared to daytime hours. Also a significant decrease in the aerosol hygroscopicity is observed in evening under urban conditions.
Technique for determination of the single scattering albedo of submicron aerosol in the approximation of lognormal size distribution of black carbon
Proceedings of SPIE, Nov 29, 2016
The technique and results of calculation of spectral dependence of the single scattering albedo (... more The technique and results of calculation of spectral dependence of the single scattering albedo (SSA) of submicron aerosol in the visible spectral region with allowance for the lognormal size distribution of absorbing matter (black carbon) are presented. The ranges of albedo variations are estimated, and peculiarities of spectral behavior and variability of SSA are studied as functions of the median radius and the halfwidth of BC size distribution for dry and wet particles in the summer period. The generalized parameter of the coarseness of BC size distribution is proposed, which takes into account simultaneously the influence of the median radius and the halfwidth. It allows good approximation of the SSA dynamics as a function of the BC size distribution parameters for dry particles by a linear dependence.
Optical-Microphysical Model of Tropospheric Aerosol Over West Siberia
Journal of Aerosol Science, Sep 1, 2001
Study of the role of particles of different size in the aerosol condensation activity by the method of diffusion selection
27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, Dec 16, 2021
When studying the condensation growth of atmospheric aerosol, many researchers note the dependenc... more When studying the condensation growth of atmospheric aerosol, many researchers note the dependence of the hygroscopic properties on the particle size. To change the aerosol size spectrum, we use diffusion selection, i.e. sequential removal of the finest fraction from the air flow. This makes it possible, on the one hand, to more accurately describe the distribution function in the size range r <0.2 μm, and, on the other hand, to increase the contribution of the intermediately dispersed fraction (r = 0.5 - 1 μm) to the formation of the optical signal. This work is devoted to the study of the sensitivity of the parameter of condensation activity of particles to changes in their size spectrum.
Journal of Aerosol Science, Jul 1, 2004
Atmospheric and Oceanic Optics, 2018
We present the quantitative estimates of the vertical distribution of absorbed solar radiation an... more We present the quantitative estimates of the vertical distribution of absorbed solar radiation and temperature effects in the background and extremely smoke-laden troposphere of Siberia, obtained using empirical data and numerical simulation. Vertical profiles of the aerosol characteristics are created based on an empirical model, relying on aircraft sensing of angular scattering coefficients and the content of absorbing particles at different altitudes. It is shown that, under the smoke-haze conditions, the radiation effect of aerosol particles with high black carbon content on the diurnal influx of solar radiation in the central part of the smoke layer exceeds 50%. The change in air temperature due to the absorption of solar radiation during the daylight hours is approximately 2.5-5.5 K when the optical depth of the smoke aerosol varies in the range 2 ≤ τ smoke (0.55 μm) ≤ 4.
SPIE Proceedings, Nov 30, 2006
Different techniques for determination of the height of the aerosol mixing layer are considered. ... more Different techniques for determination of the height of the aerosol mixing layer are considered. Seasonal behaviors of the heights of homogeneous atmosphere and submicron aerosol mixing layer are studied. It is revealed that in summer the height of the homogeneous aerosol atmosphere and the height of the mixing layer of submicron particles practically coincide with each other, while in winter
Restructuring submicron aerosol size spectrum in early spring period
Proceedings of SPIE, Nov 25, 2014
The conditions of variability of the submicron fraction of near-surface atmospheric aerosol with ... more The conditions of variability of the submicron fraction of near-surface atmospheric aerosol with radii 0,3 ÷ 0,6 microns in transitional winter-spring period in the experiments carried out on aerosol station LOA IAO SB RAS in 2009-2013 are considered. A relationship between variations of the concentration of particles and submicron aerosol condensation activity is investigated.
Relationship of the aerosol condensation activity with concentration of particles in the nanometer size range
28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, Dec 8, 2022
Lëd i Sneg, May 11, 2016
Chemical composition of aerosol in the ground layer of the coastal zone in East Antarctica is ana... more Chemical composition of aerosol in the ground layer of the coastal zone in East Antarctica is analyzed in the article. The aerosol samples were taken in 2006-2015 during seasonal works of the Russian Antarctic Expeditions (RAE), namely, these were 52 nd -53 rd , 55 th , and 58 th -60 th expeditions. Samples were taken in the 200-km band of the sea-shore zone along routes of the research vessels (REV) «Akademik Fedorov» and «Akademik Treshnikov» as well as on territories of the Russian stations Molodezhnaya and Mirny. Although the results obtained did show the wide range of the aerosol concentrations and a certain variability of their chemical composition, some common features of the variability were revealed. Thus, during the period from 2006 to 2014 a decrease of average values of the sums were noted. Spatially, a tendency of decreasing of the ion concentrations was found in the direction from the station Novolazarevskaya to the Molodezhnaya one, but the concentrations increased from the Molodezhnaya to the station Mirny. The sum of ions of the aerosol in the above mentioned coastal zone was, on the average, equal to 2.44 µg/m 3 , and it was larger than that on the territory of the Antarctic stations Molodezhnaya (0,29 µg/m 3 ) and Mirny (0,50 ág / m 3 ). The main part to the sum of the aerosol ions on the Antarctic stations was contributed by Na + , Ca 2+, Cl -, SO 4 2-. The main ions in aerosol composition in the coastal zone are ions Na + and Cl -. The dominant contribution of the sea salt and SO 4 2-can be traced in not only the composition of atmospheric aerosols, but also in the chemical composition of the fresh snow in the coastal areas of East Antarctica: at the Indian station Maitri, on the Larsemann Hills, and in a boring located in 55.3 km from the station Progress (K = 1.4÷6.1). It was noted that values of the coefficient of enrichment K of these ions decreases as someone moves from a shore to inland. Estimation of contributions of the continental and maritime factors to formation of the aerosol chemical composition revealed higher enrichment ratios for K + , Ca 2+ , SO 4 2-(K = 3.6÷13.0). This reflects not only influence of the natural sources, but the intensity of human activities on the Antarctic continent as well. The elemental composition of solid aerosols was also analyzed. The largest concentrations were determined for Zn, Al and Fe. The ratio of concentration of the elements in both the soluble and insoluble phases of the aerosol showed that 84.1% of the total amount of the elements was contained in a water-insoluble state. Fractional relation between the element concentrations changed in different phases from 16 to 98%. High enrichment of the aerosol particles by Zn, Cu, Cr, Ba, Pb, Ni, Se, As, Cd (the enrichment factors = 27÷26 445) had been revealed. The content of dominant chemical components (Na + , Cl -, Zn, Fe), factors and coefficients of the element enrichment in the aerosols as well as in fresh snow of the coastal zone of East Antarctica are indicative of the identity of sources where their composition is formed.
Seasonal variations of anthropogenic contribution into diurnal behavior of the aerosol and soot mass concentrations and the aerosol hygroscopicity in the suburb of Tomsk
A comparative analysis of the seasonal mean diurnal behavior of aerosol characteristics was carri... more A comparative analysis of the seasonal mean diurnal behavior of aerosol characteristics was carried out using the monitoring data in the suburban area of Tomsk and in the background region in 2013-2019. It is revealed that the greatest contribution of anthropogenic sources to the diurnal variation of the concentrations of submicron aerosol and soot is observed in winter during their evening maximum at 8–9 p.m. The minimum urban load on these aerosol characteristics was detected in summer at 1–2 p.m. During the evening maximum of the aerosol and soot concentrations, a decrease in the parameter of condensation activity is observed in Tomsk compared to the background region.
Relations between the aerosol optical characteristics measured on a near-ground long path and in a local volume of air
The aerosol extinction coefficients in the wavelength range from 0.45 to 3.9 μm measured on a lon... more The aerosol extinction coefficients in the wavelength range from 0.45 to 3.9 μm measured on a long horizontal path are compared with optical parameters measured in the visible wavelength range in a local air volume. The following parameters were analyzed: “dry” and “wet” angular scattering coefficients at an angle of 45°, as well as the mass concentration of the absorbing substance (“soot”) in aerosol particles. Round-the-clock measurements were carried out from March till November in 2000-2006. The comparison was carried out for three seasons: spring, summer, fall and four types of aerosol weather: “, background”, “haze”, “smog” and “smoke haze”. The role of each factor in extinction of optical radiation at different wavelengths is revealed.
XXVIII Международный симпозиум «Оптика атмосферы и океана. Физика атмосферы»
При изучении конденсационного роста атмосферного аэрозоля многими исследователями отмечается зави... more При изучении конденсационного роста атмосферного аэрозоля многими исследователями отмечается зависимость гигроскопических свойств от размера частиц. В данной работе на примере тестовых измерений рассмотрена связь параметра конденсационной активности со средним радиусом ансамбля аэрозольных частиц и объемной долей фракций d < 200 нм и d = 500 – 1000 нм. Ввиду небольшого массива данных результаты являются предварительными.