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Your search keyword '"L. I. Korshunov"' showing total 10 results
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10 results on '"L. I. Korshunov"'

1. Arctic stratospheric dehydration – Part 1: Unprecedented observation of vertical redistribution of water

Author

S. M. Khaykin, I. Engel, H. Vömel, I. M. Formanyuk, R. Kivi, L. I. Korshunov, M. Krämer, A. D. Lykov, S. Meier, T. Naebert, M. C. Pitts, M. L. Santee, N. Spelten, F. G. Wienhold, V. A. Yushkov, and T. Peter

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

We present high-resolution measurements of water vapour, aerosols and clouds in the Arctic stratosphere in January and February 2010 carried out by in situ instrumentation on balloon sondes and high-altitude aircraft combined with satellite observations. The measurements provide unparalleled evidence of dehydration and rehydration due to gravitational settling of ice particles. An extreme cooling of the Arctic stratospheric vortex during the second half of January 2010 resulted in a rare synoptic-scale outbreak of ice polar stratospheric clouds (PSCs) remotely detected by the lidar aboard the CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) satellite. The widespread occurrence of ice clouds was followed by sedimentation and consequent sublimation of ice particles, leading to vertical redistribution of water inside the vortex. A sequence of balloon and aircraft soundings with chilled mirror and Lyman- α hygrometers (Cryogenic Frostpoint Hygrometer, CFH; Fast In Situ Stratospheric Hygrometer, FISH; Fluorescent Airborne Stratospheric Hygrometer, FLASH) and backscatter sondes (Compact Optical Backscatter Aerosol Detector, COBALD) conducted in January 2010 within the LAPBIAT (Lapland Atmosphere-Biosphere Facility) and RECONCILE (Reconciliation of Essential Process Parameters for an Enhanced Predictability of Arctic Stratospheric Ozone Loss and its Climate Interactions) campaigns captured various phases of this phenomenon: ice formation, irreversible dehydration and rehydration. Consistent observations of water vapour by these independent measurement techniques show clear signatures of irreversible dehydration of the vortex air by up to 1.6 ppmv in the 20–24 km altitude range and rehydration by up to 0.9 ppmv in a 1 km thick layer below. Comparison with space-borne Aura MLS (Microwave Limb Sounder) water vapour observations allow the spatiotemporal evolution of dehydrated air masses within the Arctic vortex to be derived and upscaled.

Published
2013
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2. The FLASH instrument for water vapour measurements on board of high altitude airplane

Author

Vladimir Yushkov, L. I. Korshunov, Armin Afchine, F. Ravegnani, Cornelius Schiller, A. E. Ulanovskii, N. M. Sitnikov, M. Kraemer, A. Mangold, and V. I. Astakhov

Subjects
business.product_category, Meteorology, Hygrometer, Effects of high altitude on humans, Atmospheric sciences, Airplane, Troposphere, Flash (photography), Observatory, Environmental science, business, Instrumentation, Stratosphere, Water vapor
Abstract

A fluorescent airborne stratospheric hygrometer (FLASH) for precise water vapor measurements on board a high-altitude airplane in the upper troposphere and the lower stratosphere has been developed and produced at the Central Aerological Observatory. The range of measured water vapor concentrations is 0.5–300 ppmv at altitudes of 8–21 km. The results of laboratory tests of the instrument are compared to the data of the other hygrometers. Some results of water vapor measurements on board the Geofizika M55 high-altitude airplane in different regions of the Earth are presented.

Published
2007

3. Using vacuum ultraviolet sources in the design of a fluorescence hygrometer

Author

Vladimir Yushkov, A. D. Dubakin, D. V. Budovich, V. I. Astakhov, Alexey Lykov, V. L. Budovich, and L. I. Korshunov

Subjects
Materials science, Hygrometer, Hydrogen, business.industry, Applied Mathematics, Krypton, General Engineering, chemistry.chemical_element, Fluorescence, Atomic and Molecular Physics, and Optics, Vacuum ultraviolet, Computational Mathematics, Optics, chemistry, Modulation, Optoelectronics, business, Stratosphere, Water vapor
Abstract

This paper describes a fluorescence hygrometer for measuring the microconcentration of water vapor in the stratosphere. The vacuum ultraviolet sources to be used in the hygrometer are considered. Questions of the temperature dependence of the characteristics of hydrogen and krypton glow-discharge lamps are discussed, as well as the operation of the lamps in the modulation regime. The results of laboratory and field tests of the hygrometer are presented.

Published
2012

6. Anthracene Crystals Under Intensive Optical Pumping

Author

I. I. Tartakovskii, V. A. Benderskii, A. G. Lavrushko, L. I. Korshunov, O. S. Avanesjan, V. Kh. Brikenstein, and V. L. Broude

Subjects
Optical pumping, Anthracene, chemistry.chemical_compound, Range (particle radiation), Annihilation, Quenching (fluorescence), chemistry, Lattice defects, Analytical chemistry, Nitrogen laser, Fluorescence
Abstract

The fluorescence of a number of anthracene crystals has been studied over a wide range of nitrogen laser optical pumping. The conditions for the separate study of light generation in the plane-parallel anthracene plates and nonlinear fluorescence quenching due to exciton-exciton annihilation have been found. The threshold of generation I n (l) and quenching constant k ss have been found to be substantially dependent on the structural perfection of crystals. The values of I n (1) and K ss are reduced to 4.1019 cm−2 sec−1 and ∼ 10−9 cm3 sec−1 respectively in the most perfect subliminated plates. The decrese in the quenching constant is connected with the nontrivial influence of lattice defects on the process of exciton-exciton annihilation.

Published
1974

8. Electron work function from metals in a liquid dielectric

Author

Ya. M. Zolotovitskii, V.A. Benderskii, and L. I. Korshunov

Subjects
chemistry.chemical_compound, Chemistry, Inorganic chemistry, Liquid dielectric, Analytical chemistry, chemistry.chemical_element, Dimethylformamide, Work function, General Chemistry, Electron, Polarization (electrochemistry), Mercury (element)
Abstract

1. The work functions of the electron in water were determined for 17 metals, as well as those from mercury in alcohols and dimethylformamide. 2. The energies of electronic polarization of water, alcohols, and dimethylformamide were calculated. The values found are correlated with the calculated energies of the nonsolvated electrons in these media.

Published
1972

9. Determination of the points of zero charge of metals by the pulsed preheating method

Author

V. Ya. Bartenev, V.A. Benderskii, Ya. M. Zolotovitskii, and L. I. Korshunov

Subjects
Aqueous solution, Chemistry, Analytical chemistry, chemistry.chemical_element, General Chemistry, Point of zero charge, Mercury (element)
Abstract

1. A new method was proposed for determining the points of zero charge (PZC), based on the change at the PZC in the sign of the preheating currents, arising during pulsed illumination of the electrode-solution interface. 2. The method was used to measure the PZC of mercury in aqueous and nonaqueous solutions. 3. The PZC of a number of solid metals were measured and agree with the literature data.

Published
1971

10. The Photoelectric Effect at the Metal–Electrolyte Boundary

Author

Ya. M. Zolotovitskii, L. I. Korshunov, and V.A. Benderskii

Subjects
Boundary layer, Chemistry, Chemical physics, Photoelectrochemistry, Inverse photoemission spectroscopy, Angle-resolved photoemission spectroscopy, General Chemistry, Electron, Electrolyte, Photoelectric effect, Atomic physics, Solvated electron
Abstract

Photoelectrochemistry is a new branch of physical chemistry, with many applications in the study of boundary layer structure, the energetics of electrons in solutions, the mechanism of photoemission, and the kinetics of fast reactions in solutions initiated by solvated electrons. 110 references.

Published
1971

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