Home – Home – Jornals – Advanced Search

The new method of calculation of rotation-vibration line broadening of asymmetric tops is proposed. The application of this method allows one to obtain the linewidths having been based on some empirical data without complicated calculations. Using experimental data a vibrational dependence of averaged energy difference is deduced. The approach was used for calculation of H ₂O and HDO lines broadening. Comparisons of the theoretical line shape parameters with the experimental values in different absorption bands are made.

Statistical analysis of the links between direct aerosol radiative forcing at the upper boundary of the atmosphere (ARF), aerosol radiative perturbation at the lower boundary of the atmosphere (ARP) in spectral range from 0.2 to 4.0 m and optical and microphysical characteristics of atmospheric aerosol was carried out using measurements by global network AERONET in the Middle Urals during 2004-2014. It is proposed to use multiple regression analysis to build simple models of ARF, ARP - parameters of the aerosol. The ranked sets of the most significant statistically independent predictors of aerosol parameters were found. The semi empirical linear and nonlinear statistical models of the influence of the atmospheric aerosol on perturbation fluxes of short-wave solar radiation on the upper and lower boundary of the atmosphere were proposed.

Comparison of four aerosol models is carried out: two one-parametrical models for a ground layer of an arid zone of Kazakhstan, two-parametrical model for horizontal routes and two-parametrical model for horizontal and inclined routes. It is shown that the models received with use of new methods of creation of linear regression and division into components allow one to restore physically correctly not only values of coefficients of aerosol extinction, but also their mean square deviations.

Analysis of the data series of the surface temperature from weather stations of Eurasia have been performed with use of analytic signals. The climatic classes are allocated by comparing the phase of the temperature series with an estimated phase during iterations. This computing technology is first applied to the study of climate processes. The new approach is informative and corresponds to the known concepts of the climate geography. It follows that phasing and synchronicity are essential features of climate processes on the Earth.

We present observation results of airglow variations in emissions of OI 557.7 nm, OI 630 nm, and NaI 589.0-589.6 nm in Eastern Siberia after the Chelyabinsk meteorite fall on February 15, 2013. In the first nights, we discovered certain features of OI 557.7 nm, OI 630 nm, and NaI 589.0-589.6 nm emissions related to the changes of mean night intensities (OI 557.7 nm emission decrease, NaI 589.0-589.6 nm emission increase) and night variations in these emissions. A month after the fall of the Chelyabinsk meteorite, intervals were found with increasing intensities of OI 557.7 nm and NaI of 589.0-589.6 nm emissions as compared to preceding periods. Nature of some marked features of variations in OI 557.7 nm, OI 630 nm, and NaI 589.0-589.6 nm emissions does not exclude their possible coupling with the Chelyabinsk meteorite.

The paper presents the improved method of determining meteorological air pollution potential (MAPP) based on the use of surface meteorological data available for any weather station in Russia. Testing of the methods was performed on the data obtained from 196 weather stations in Western Siberia during the period 1986 to 2010. Boundary conditions to distinguish areas with different meteorological resources for dispersion of pollutants were specified. Interannual and territorial variability of MAPP was analyzed. Correlation coefficients were found between the MAPP values and the levels of air pollution with both separate ingredients and a pollution index as a whole (APS ₄).

In this paper a number size distribution of atmospheric nanoparticles has been analyzed with a view to estimate particle formation and growth rates during the nucleation bursts observed in the atmospheric surface layer over West Siberia. Estimates showed that during the period from March 2010 to August 2014, inclusively, new particle formation and growth rates ranged from 0.1 to 3.55 cm ^-3 × s ^-1 and from 0.26 to 53.04 nm × h ^-1, respectively. Results of continuous long-term observations recently carried out at two atmospheric monitoring stations located in Siberia point out a similarity of them with the frequency and main characteristics of nucleation bursts recorded in other regions of the boreal belt. Statistical data on nucleation bursts obtained in our region can be used when modeling the climate change and developing methods of their identification on a global scale with the use of satellite data.

Development of a passive optical method for estimating the atmospheric turbulence strength (refractive index structure constant C _n ² of atmosphere) from image jitter is discussed. It is proposed that high rate digital camera and fast parallel 2-D image processing algorithms are used for real-time C _n ² measurements. A comparison is made of the results obtained by passive and active optical and acoustic methods.

A modified method of the radial velocities (RV) is offered. On the base of results of the numerical simulation that imitates operation of “Stream Line” and 2-mm pulsed coherent Doppler lidars (PCDL) we analyze accuracy of the estimation of aircraft wake vortex parameters using the RV method. Results are presented of field experiments carried out with the aim to obtain estimates for vortex axis trajectories and dependence of the vortex circulation on time from arrays of the radial velocity measured by these lidars. For the case of 2-mm PCDL we compared results given by methods of velocity envelopes and RV. The limits of applicability of the RV method have been determined.

We explored fire torch’s radiation in laboratory conditions. Fire torch was burning from a tank, which was fixed at the axis of uprising flow of air. Ethanol was used as a fuel. The description of processing of a thermogram sequence of the twisted torch is presented. The rotation frequency was determined by FFT conversion of time pulsation of thermovision signal.