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41.
Doklady Earth Sciences - Using the remote sensing data obtained by the Sentinel-1A and Sentinel-1B satellites in the years 2016–2021, a local accumulation of oil slicks in the Barents Sea in... 相似文献
42.
Mizandrontsev I. B. Kozlov V. V. Ivanov V. G. Kucher K. M. Korneva E. S. Granin N. G. 《Water Resources》2020,47(1):122-129
Water Resources - Data on the vertical distribution of dissolved methane in Baikal water column are analyzed. The zone of open lake now shows an increase in the concentrations of dissolved methane... 相似文献
43.
Magnetotelluric soundings are frequently carried out on a single profile or on profiles remote from each other. Interpretation
of the obtained data is difficult in the presence of spatially heterogeneous geoelectric structures. We evaluate its capabilities
on the basis of the synthetic data, that correspond to a geoelectric model, which consists of a three-layered section in the
background and three rectangular prisms, differently arranged relative to the profile. Using the simple methods of analysis
of magnetotelluric data, we succeeded in allocating all three heterogeneities over the area that surrounds the profile of
observations. As a result of the fast smoothed-structure 1D and 2D inversion of different components of data, taking into
account their specific features, the depths of the occurrence of anomalies and the order of the values of their electrical
resistivity were evaluated, and the background section was also reconstructed. On this basis, and, also, with the use of a
priori geological-geophysical information, the construction of a 3D model in a more or less broad band around the profile
and its correction with the aid of 3D data inversion are possible. 相似文献
44.
K. G. Ivanov 《Geomagnetism and Aeronomy》2009,49(5):557-565
The phenomena of superconcentration of the large-scale field photospheric sources in the main zone of active longitudes, blocking of regular differential rotation by these sources, and origination of the four-sector structure of the solar magnetic field during the decline phase of cycle 23 have been considered in more detail and taking into account the polar correction. It has been indicated that superconcentration was formed due to the penetration of photospheric sources into the zone from the western surroundings of this zone and owing to the generation of the large-scale field in the zone itself. The dynamics of a blocking-induced complex MHD disturbance with reflected from the zone and reconnecting photospheric sources of negative and positive polarity, respectively, and the transformation of the bisector structure into the four-sector one have been considered. It has been indicated that the dynamics of this MHD disturbance was responsible for that of associated solar activity: the generation of sunspot groups, appearance of flares, and, finally, origination of a powerful heliospheric storm and the solar-terrestrial extrastorm of July 22–27, 2004. 相似文献
45.
D. V. Alekseev V. A. Ivanov E. V. Ivancha V. V. Fomin L. V. Cherkesov 《Russian Meteorology and Hydrology》2013,38(4):248-255
An effectiveness of the storm wave attenuation by protective piers in the Sevastopol Bay of the Black Sea is studied on the basis of numerical simulation using the SWAN spectral model. Analyzed are the parameters of waves generated by winds of four main directions as well as by the southern cyclone during the storm on November 11, 2007. It is obtained that waves from the northwest part of the Black Sea penetrate most intensively into the Sevastopol Bay in case of western wind and, to a lesser degree, in case of northern and southern winds. A protective effect of the piers is observed in the west part of the bay only and the wave attenuation near the southern coast is more significant than near the northern one. The area of the southern coast directly behind the southern pier is completely protected from the storm waves and, as moving away from the pier, the danger of intensive wave effect on the coast is kept. 相似文献
46.
D. V. Alekseev V. A. Ivanov E. V. Ivancha V. V. Fomin L. V. Cherkesov 《Russian Meteorology and Hydrology》2008,33(3):180-186
Processes of roiling, transport-diffusion, and deposition of fine disperse bottom sediments are studied in the northwestern
shelf of the Black Sea in different synoptic situations connected with the passage of cyclones. Movement of atmospheric disturbances
with velocities of 5 and 15 m/s along three trajectories typical of this region is considered. A nonlinear sigma-coordinate
numerical model is used to calculate hydrodynamic and suspension concentration fields. The bottom areas, most sensitive to
erosion, and the areas of maximum accumulation of depositions due to their sedimentation are determined. The change in suspension
distribution in the surface layer with time is studied. 相似文献
47.
M. M. Ivanov N. N. Ivanova V. N. Golosov E. N. Shamshurina 《Geography and Natural Resources》2016,37(4):355-361
We examine the use of two alternative techniques for assessing the redistribution volumes of sorbed 137Cs within the upper components of the fluvial network, based on the concept of catchment as a lithodynamical system. In terms of one of them, we made a substantive analysis of changes in reserves on accumulative positions where the 137Cs distribution curves showed a significant increase in radionuclide content levels. We carried out a typization o the accumulation surfaces in order to extrapolate data, obtained for a group of soil profiles, to the territory of the entire catchment and to make a direct assessment of the increases in accumulation. An alternative technique was used to assess the volumes of accumulated sediment loads on accumulative positions by analyzing the 137Cs distribution curves, and to correlate with denudation zones in the drainage area under consideration. Values of the wash-out rates for the period 1986–2012 have been obtained, which are necessary for the formation of the accumulative layer observed. We calculated the volume of 137Cs swept away during 26 years after the Chernobyl accident, based on information regarding the volumes of initial reserves in the denudation zones and a correlation between the erosion rate and a specific reduction in reserves. It is established that the technique on the basis of analyzing the wash-out zones featuring high economical efficiency can be used in assessing 137Cs migration for larger territories with relatively low labor-consuming effort. 相似文献
48.
R. R. Gabdullin N. V. Badulina E. A. Bakai E. V. Rubtsova A. Yu. Yurchenko E. V. Karpova A. V. Ivanov M. A. Varzanova A. V. Sergienko T. A. Konovalova M. V. Parakhina 《Moscow University Geology Bulletin》2018,73(4):346-360
The composition and origin of the Callovian–Oxfordian deposits of the Sudak Bay were characterized on the basis of the generalization and analysis of our own results, as well as published and unpublished data. The botanical future was first implemented for the geological mapping of the Oxfordian deposits. 相似文献
49.
A. A. Boyarchuk B. M. Shustov I. S. Savanov M. E. Sachkov D. V. Bisikalo L. I. Mashonkina D. Z. Wiebe V. I. Shematovich Yu. A. Shchekinov T. A. Ryabchikova N. N. Chugai P. B. Ivanov N. V. Voshchinnikov A. I. Gomez de Castro S. A. Lamzin N. Piskunov T. Ayres K. G. Strassmeier S. Jeffrey S. K. Zwintz D. Shulyak J.-C. Gérard B. Hubert L. Fossati H. Lammer K. Werner A. G. Zhilkin P. V. Kaigorodov S. G. Sichevskii S. Ustamuich E. N. Kanev E. Yu. Kil’pio 《Astronomy Reports》2016,60(1):1-42
The article presents a review of scientific problems and methods of ultraviolet astronomy, focusing on perspective scientific problems (directions) whose solution requires UV space observatories. These include reionization and the history of star formation in the Universe, searches for dark baryonic matter, physical and chemical processes in the interstellar medium and protoplanetary disks, the physics of accretion and outflows in astrophysical objects, from Active Galactic Nuclei to close binary stars, stellar activity (for both low-mass and high-mass stars), and processes occurring in the atmospheres of both planets in the solar system and exoplanets. Technological progress in UV astronomy achieved in recent years is also considered. The well advanced, international, Russian-led Spektr-UV (World Space Observatory—Ultraviolet) project is described in more detail. This project is directed at creating a major space observatory operational in the ultraviolet (115–310 nm). This observatory will provide an effective, and possibly the only, powerful means of observing in this spectral range over the next ten years, and will be an powerful tool for resolving many topical scientific problems. 相似文献
50.
Shchetnikov A. A. Bezrukova E. V. Kerber E. V. Belozerova O. Yu. Kuzmin M. I. Ivanov E. V. Krainov M. A. Filinov I. A. Nechaev I. O. 《Doklady Earth Sciences》2019,486(1):503-506
Doklady Earth Sciences - The first results of tephrochronological studies of Late Pleistocene–Holocene volcanic eruptions in the Zhom-Bolok River valley (Eastern Sayan) are reported. Based on... 相似文献