Field studies of variation scales of gravitational capillary waves and near-water wind in the Black Sea shelf area     

V. V. Bakhanov  N. A. Bogatov  A. S. Volkov  A. V. Ermoshkin  E. M. Zuykova  V. I. Kazakov  O. N. Kemarskaya  V. N. Lobanova  I. A. Repina  V. I. Titov 《Izvestiya Atmospheric and Oceanic Physics》2010,46(2):232-238

In this study we present the results of data processing from the 2004 Gelendzhik Bay expedition on the Akvanavt research vessel. The data were processed using the method of wavelet analysis. We found an emerging kilometer-scale variation in the surface heaving and near-water wave over the shelf area. This effect was shown to be possibly caused by the inhomogeneity of current in the depth-drop area.  相似文献   

The First Find of Seals of the Genus Pachyphoca (Carnivora,Phocidae) in Miocene Rocks of Rostov Region     

Tarasenko  K. K.  Titov  V. V. 《Doklady Earth Sciences》2022,505(2):558-561

Doklady Earth Sciences - The fossil remains of a seal of the genus Pachyphoca from the Upper Miocene Sarmatian stratum of the Morskaya-3 site (Neklinovskii district, Rostov region) were described....  相似文献   

Temporal and spatial patterns of modern climatic warming: case study of Northern Eurasia   总被引：1，自引：0，他引：1  

Oleg Anisimov  Vasily Kokorev  Yelena Zhil’tsova 《Climatic change》2013,118(3-4):871-883

Century-scale near-surface air temperature data from 744 weather stations in Russia and neighboring countries indicate that the temperature variations have distinct temporal patterns. Two periods, near the beginning and at the end of the 20th century, experienced the largest warming rates. Temperature changes in both periods were not uniform in time or space. We used statistical criteria and applied them to data at the weather stations to define a “tipping point” corresponding to the beginning of the modern climatic period. Results indicate that the position of this point depends on location, and in most cases falls into the interval from the early 1970s through the late 1980s. By means of spatial correlation analysis we delineated regions with coherent air temperature changes and calculated the region-specific rates and magnitudes of changes. We compared the distribution of regional tipping points in time and over space with large-scale atmospheric circulation patterns over northern Eurasia. We analyzed the 20th—early 21st century changes in the relative frequencies of the three circulation forms defined by Vangengheim-Girs classification, and found their qualitative correspondence with the spatial temperature patterns and spread of the tipping points in time. These results improve our knowledge about the regional structure and drivers of modern climate change in northern Eurasia, which is likely to hold the fingerprint of the anthropogenic signal. Findings of this study can be used to obtain insight into regional climatic changes in northern Eurasia over the next few decades.  相似文献   

On the method of calculating two-dimensional potential magnetic fields with current sheets     

V. S. Titov 《Solar physics》1992,139(2):401-404

The method of calculating two-dimensional potential magnetic configurations with current sheets (CS) is proposed, the number of CS in corona and the degree of asymmetry being both arbitrary. As a given boundary value the component of magnetic field normal to the photosphere is considered.  相似文献   

Non-geometrical waves–are there any? An asymptotic description of some 'non-geometrical' phenomena in seismic wave propagation     

Vasily M. Babich  Aleksey P. Kiselev 《Geophysical Journal International》1989,99(2):415-420

  相似文献   

Thermal interaction between near-water atmospheric layer and surface water layer on the northeastern shelf of the Black Sea     

V. B. Titov  L. A. Chasovnikova 《Russian Meteorology and Hydrology》2012,37(8):560-566

Thermal interaction between near-water atmospheric layer and surface water layer is considered within long-term, seasonal, synoptic, and mesoscale variability ranges from long-term air and water temperature measurement data. It is established that long-term mean monthly values of water temperature within annual cycle are greater than corresponding values of air temperature. Equations of relationships are obtained for long-term mean annual, mean seasonal, and mean monthly air and water temperature values.  相似文献   

Venus express: Highlights of the nominal mission     

D. V. Titov  H. Svedhem  F. W. Taylor  S. Barabash  J. -L. Bertaux  P. Drossart  V. Formisano  B. Häusler  O. Korablev  W. J. Markiewicz  D. Nevejans  M. Pätzold  G. Piccioni  J. -A. Sauvaud  T. L. Zhang  O. Witasse  J. -C. Gerard  A. Fedorov  A. Sanchez-Lavega  J. Helbert  R. Hoofs 《Solar System Research》2009,43(3):185-209

Venus Express is the first European (ESA) mission to the planet Venus. Its main science goal is to carry out a global survey of the atmosphere, the plasma environment, and the surface of Venus from orbit. The payload consists of seven experiments. It includes a powerful suite of remote sensing imagers and spectrometers, instruments for in-situ investigation of the circumplanetary plasma and magnetic field, and a radio science experiment. The spacecraft, based on the Mars Express bus modified for the conditions at Venus, provides a versatile platform for nadir and limb observations as well as solar, stellar, and radio occultations. In April 2006 Venus Express was inserted in an elliptical polar orbit around Venus, with a pericentre height of ～250 km and apocentre distance of ～66000 km and an orbital period of 24 hours. The nominal mission lasted from June 4, 2006 till October 2, 2007, which corresponds to about two Venus sidereal days. Here we present an overview of the main results of the nominal mission, based on a set of papers recently published in Nature, Icarus, Planetary and Space Science, and Geophysical Research Letters.  相似文献   

Isochron‐burial dating of glaciofluvial deposits: First results from the Swiss Alps          下载免费PDF全文

Naki Akçar  Susan Ivy‐Ochs  Vasily Alfimov  Fritz Schlunegger  Anne Claude  Regina Reber  Marcus Christl  Christof Vockenhuber  Andreas Dehnert  Meinert Rahn  Christian Schlüchter 《地球表面变化过程与地形》2017,42(14):2414-2425

In this study, we use isochron‐burial dating to date the Swiss Deckenschotter, the oldest Quaternary deposits of the northern Alpine Foreland. Concentrations of cosmogenic ¹⁰Be and ²⁶Al in individual clasts from a single stratigraphic horizon can be used to calculate an isochron‐burial age based on an assumed initial ratio and the measured ²⁶Al/¹⁰Be ratio. We suggest that, owing to deep and repeated glacial erosion, the initial isochron ratio of glacial landscapes at the time of burial varies between 6.75 and 8.4. Analysis of 22 clasts of different lithology, shape, and size from one 0.5 m thick gravel bed at Siglistorf (Canton Aargau) indicates low nuclide concentrations: <20 000 ¹⁰Be atoms/g and <150 000 ²⁶Al atoms/g. Using an ²⁶Al/¹⁰Be ratio of 7.6 (arithmetical mean of 6.75 and 8.4), we calculate a mean isochron‐burial age of 1.5 ± 0.2 Ma. This age points to an average bedrock incision rate between 0.13 and 0.17 mm/a. Age data from the Irchel, Stadlerberg, and Siglistorf sites show that the Higher Swiss Deckenschotter was deposited between 2.5 and 1.3 Ma. Our results indicate that isochron‐burial dating can be successfully applied to glaciofluvial sediments despite very low cosmogenic nuclide concentrations. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

Seismogravitational oscillations and a change in the Earth’s rotation rate in a period range from 1 to 5 h in December 2004     

L. N. Petrova  O. A. Titov 《Seismic Instruments》2014,50(1):37-51

The observations carried out using a seismogravimeter in St. Petersburg simultaneously with the variations of the Earth’s rotation rate determined based on the results of observations with radiotelescopes located at large distances from each other at the surface of the Earth are compared with each other. It is found that the simultaneous observations agree with each other in the daily variation dynamics. It is also found that the distribution of spectral components along the frequency axis in the spectra of these observations in a period range from 1 to 5 h corresponds to a long-known distribution of frequencies at which the Earth’s oscillations arise most often. It is also shown that the spectra in a period range from 1 to 5 h obtained in different years using the astronomical data, the superconducting gravimeter observations, and the seismogravimeter observations at points located at large distances from each other agree with each other very well. Individual oscillation components have comparable amplitudes and may not be of a tidal nature. An explanation that allows one to examine the entire body of obtained results from a unified perspective is proposed.  相似文献   

Gold–quartz deposits of the Zhdaninsky ore–placer cluster,eastern Yakutia: Structural control and formation conditions     

V. V. Aristov  I. I. Babarina  A. V. Grigor’eva  V. Yu. Alekseev  V. Yu. Prokof’ev  A. A. Uzyunkoyan  O. V. Zabolotskaya  S. G. Titov 《Geology of Ore Deposits》2017,59(1):68-101

Gold deposits and occurrences small in reserves and high in Au grade conventionally determine the line of prospecting in terrigenous sequences of the Verkhoyansk–Kolyma region. In this paper, the geological structure of such gold objects is considered with the example of the deposits and prospects making up the Zhdaninsky ore–placer cluster in the Republic of Sakha (Yakuia). From lithological, structural, and mineralogical–geochemical data, the formation conditions of ore-bearing complexes are specified, the geological evolution history of the northern Ol’chan Zone of the Kular–Nera Belt is reconstructed, and the zonal distribution of mineralization within the ore–placer cluster is revealed. The structural–compositional complexes were formed in the following succession: (1) sedimentation at the shelf of the passive margin accompanied by synsedimentation deformations; (2) metagenesis of sediments and the development of bedding-plane intraformational detachments of collision stage D₁ under conditions of tangential compression and accompanied by the formation of carbon dioxide–aqueous metamorphic fluid at a temperature of 300°C and under a pressure of 1.4 kbar; (3) folding and faulting of orogenic stage D₂ with the formation of synkinematic magmatic bodies, metasomatic alteration, and Au-bearig mineral assemblages. Small Au-bearing objects with veined mineralization and high Au grade are localized in structures of stage D₂ transverse to bedding-plane schistosity S₁. They form at the collision stage above intraformational detachment surfaces and are controlled by shear structures of the orogenic stage with misalignment of these deformations. The ore zoning is determined by the distribution of Co and Ni minerals and by variations in the anionic composition of ore (S, As, Sb).  相似文献