Horizontal structural functions in troposphere for radio waves refractivity index by use of ground set of GPS-GLONASS receivers

In this paper we show results of troposphere fluctuation analysis and its influence on radiowaves refractive index variations. For comparison of inhomogeneous impurities structure we used electromagnetic waves refraction index data which don't depend on impurity but depend on atmospheric parameters only. Our main object of investigation is a mesoscale process in tropo- sphere. We can estimate space structure of atmospheric parameters, using the data from network based on Global Navigation Satellite System receivers. We used structure function to estimate characteristics of impurities and refraction index fluctuation. Function shows the contribution of the processes of the defned scale in the total variance of the fluctuations. The received structure functions demonstrate increasing with distance between stations. The results show a significant effect on electromagnetic wave refraction index caused by the mesoscale troposphere process

GPS-Derived zenith tropospheric delay assimilation into numeric atmosphere model

© 2014 SPIE. The total zenith tropospheric delay (ZTD) is an important parameter of the atmosphere and directly or indirectly reflects the weather processes and variations. This paper presents a hardware and software complex for continuous measurements and prediction of atmospheric thermodynamics and radiowaves refraction index. The main part is a network of ground-based spatially separated GPS-GLONASS receivers, which allows the remote sensing zenith tropospheric delay. GPS-Derived Zenith Tropospheric Delay shows the day to day variation and mesoscale spatial and temporal variability. Comparison with the numerical weather reanalysis fields and solar photometer measurements showed agreement with the relative deviation of less than 10%. Hardware-software complex includes the numerical model of the atmosphere on a computational cluster. A variational assimilation system was used to examine the comparative impact of including satellite derived total zenith tropospheric delay from GPS and GLONASS ground observations. Preliminary results show that the initial field of radiowaves refraction index was improved by assimilating the satellite derived ZTD

On the possibility of studying the horizontal structural functions of the tropospheric radio-wave refractive index using a network of GPS and GLONASS receiving stations

We present the results of experimental study of the horizontal structural functions of the tropospheric delay of radio waves and the altitude variations (0-10 km) of the structural function of the radio-wave refractive index, calculated using the data of the networks of the GPS and GLONASS satellite navigational systems spaced at 1-35 km. © 2012 Springer Science+Business Media New York

Variability of the Tropospheric-Delay Temporal Structure Function of Radio Signals from the Global Navigation Satellite Systems Versus Tropospheric Surface Layer Parameters

© 2016, Springer Science+Business Media New York.We present the results of a four-year (2009–2012) study of the decimeter radio wave propagation using signals from the global navigation satellite system (GNSS) and simultaneous measurements of the tropospheric surface layer parameters in the city of Kazan. Inter- and intra-annual variabilities of the temporal structure functions of the zenith tropospheric delay (ZTD) of decimeter radio waves are analyzed. It has been found that the contribution of irregularities with time scales of up to 24 h to the ZTD fluctuation variance varies, depending on the surface weather parameters (temperature and pressure). Correlation coefficient between the approximation exponents of the ZTD temporal structure function of decimeter radio waves and surface temperature reaches 0.77 for fluctuations with time scales of up to 8 h. It has been established that synoptic processes and the underlying surface affect the formation of mesoscale fluctuations on the phase path of radio signals from the navigation satellite systems

Interannual and seasonal variability of atmospheric inhomogeneities from satellite systems data and it's correlation with atmosphere monitoring

© 2016 SPIE.In this paper we presented results long-term experimental study of atmosphere remote sensing by GPS-GLONASS signals and simultaneous near surface atmospheric parameters measurements in Kazan city. During the period of 2010 - 2012. The interannual and seasonal variability of the radiovawes zenith tropospheric delay structure functions was analyzed. The correlation coefficient of the of the time structure function decimeter radio waves zenith tropospheric delay power approximation with surface temperature reaches a value of 0.73 for the fluctuations with time scales up to 8 hours. According to the results it can be assume a strong influence of the synoptic processes and the underlying surface on the formation of mesoscale fluctuations in the satellite navigation systems phase path

Variability of GPS-derived zenith tropospheric delay and some result of its assimilation into numeric atmosphere model

The total zenith tropospheric delay (ZTD) is an important parameter of the atmo- sphere and directly or indirectly reflects the weather processes and variations. This paper presents a hardware and software complex for continuous measurements and prediction of atmospheric thermodynamics and radiowaves refraction index. The main part is a network of ground-based spatially separated GPS-GLONASS receivers, which allows the remote sensing zenith tropo- spheric delay. GPS-Derived Zenith Tropospheric Delay shows the day to day variation and mesoscale spatial and temporal variability. Comparison with the numerical weather reanalysis fields and solar photometer measurements showed agreement with the relative deviation of less than 10%. Hardware-software complex includes the numerical model of the atmosphere on a computational cluster. A variational assimilation system was used to examine the comparative impact of including satellite derived total zenith tropospheric delay from GPS and GLONASS ground observations. Preliminary results show that the initial field of radiowaves refraction index was improved by assimilating the satellite derived ZTD

Interannual Variability of Surface and Integrated Water Vapor and Atmospheric Circulation in Europe

© 2018, Pleiades Publishing, Ltd. The variability of time series of the integrated water vapor of the atmosphere and the surface partial pressure of water vapor for the territory of Europe over a long period have been studied. The main contribution to the variance of both integrated and surface water vapor is made by seasonal variations of 60–70%; mesoscale processes, 7–17%; and synoptic processes, 17–27%. The linear trend contributes less than 1% to the overall variance of the variability of the atmospheric water vapor in Europe. It has been shown that the interannual variability of the atmospheric water vapor manifests itself both in quasi-periodic variations in the annual average values and in variations in the intensity of synoptic processes. The irregular coherence of variations in the circulation indices and surface partial water vapor pressure in Europe with periods of 2–3, 5–6, 8–11, and 10–13 years has been established

Study of mesoscale irregularities of the refraction coefficient of radiowaves in the troposphere by the methods of numerical simulation

We propose a model of the mesoscale irregular structure of the refraction coefficient of radiowaves and its dynamics in the real atmosphere at altitudes of up to 20 km. This model was verified according to multiyear continuous measurements. The obtained dynamics of the refraction coefficient shows considerable horizontal, vertical, and temporal variability of the mesoscale irregular structure as well as anisotropy of the horizontal spatial structure of the refraction coefficient, which is determined by the fields of wind speed and the synoptic gradient of atmospheric pressure. Dependences of the disturbance of the optical length of the radio paths on the path length, zenith angle, time of the day, and meteorological conditions are found. © 2010 Springer Science+Business Media, Inc

Hardware-software system for monitoring of atmospheric water vapor structure in the city of Kazan

© Published under licence by IOP Publishing Ltd. Methodology and software to reconstruct the spatial-temporal structure of water vapor in the troposphere by GNSS signals measured by ground-based receivers is developed. In this paper, measurements of a satellite navigation system receiver network located near the city of Kazan are used. It is shown that using a tomographic approach it is possible to reconstruct the altitude profile of the refractive index in the lower atmosphere and its space-time variations. The tomography method gives less smoothed results than Tikhonov's method

SENSING of the structure of the radio wave refractivity in the troposphere by a network of satellite navigation system receivers in the city of Kazan

We present the results of an experimental study of the structure of the radio-wave refractivity and its dynamics by a network of seven ground-based GPS and GLONASS receivers in Kazan, Russia. It is shown that the remote sensing results agree well with the data of weather stations, radio sounding, and reanalysis. The standard deviation of the refractivity value, which are obtained using the sensing results from the radio sounding data amounts to 2% of the average value at altitudes of up to 500 m. It is found that the refractivity structure has overnight variations, as well as and mesoscale spatial and temporal variability. ©2011 Springer Science+Business Media, Inc