Influence of the dynamics of currents on the hydrophysical structure of the waters and the vertical exchange in the active layer of the Black Sea     

A. G. Zatsepin  N. N. Golenko  A. O. Korzh  V. V. Kremenetskii  V. T. Paka  S. G. Poyarkov  P. A. Stunzhas 《Oceanology》2007,47(3):301-312

An analysis of the data of measurements of the fine structure and microstructure fluctuations of hydrophysical fields in the upper 200-m layer of the Black Sea carried out using CTD profilers and a Baklan free falling microstructure and turbulence profiler revealed the existence of a positive correlation between the intensity of the fine structure and microstructure fluctuations and the dynamics of the currents. On the other hand, the level of the fine structure and microstructure fluctuations reflects the rate of the vertical turbulent exchange. It was shown that, in the case of the absence of the Black Sea Rim Current (BSRC) jet or clearly manifested mesoscale eddy structures, the vertical turbulent exchange in the pycnocline is weak, while, in the opposite case, it is stronger. The results obtained support the supposition that the interbasin dynamics play an important role in the maintenance of the rate of small-scale mixing in the pycnocline and halocline and provide the vertical transport of dissolved oxygen from the cold intermediate layer into the deeper layers of the sea.  相似文献   

Physical mechanisms of submesoscale eddies generation: evidences from laboratory modeling and satellite data in the Black Sea     

Zatsepin  Andrey  Kubryakov  Arseny  Aleskerova  Anna  Elkin  Dmitry  Kukleva  Olga 《Ocean Dynamics》2019,69(2):253-266

Ocean Dynamics - The observed evidence of the implementation of three different mechanisms of the submesoscale eddies generation in the Black Sea previously studied by the field research and...  相似文献   

Akvazond moored automatic measuring system for vertical profiling of the marine medium     

A. G. Ostrovskii  A. G. Zatsepin  V. A. Derevnin  S. S. Nizov  S. G. Poyarkov  A. L. Tsybulskiy  D. A. Shvoev 《Oceanology》2008,48(2):275-283

The design and application of the Akvazond moored automatic water profiling system is described. The system was developed at the Shirshov Institute of Oceanology of the Russian Academy of Sciences. The system is designed for multidisciplinary oceanological studies and environmental monitoring on the sea shelves and continental slopes. An autonomous carrier (marine elevator) for different oceanic measuring equipment was developed for the first time in the practice of Russian oceanography. It is a carrier, for example, for an acoustic Doppler current meter, a CTD-profiler, a sensor of dissolved oxygen, a fluorometer, a turbidity meter, etc. The Akvazond system has an energy resource sufficient for profiling the water column in the programming regime for up to several months. The total length of the vertical displacement of the system at a nominal capacity of the power supply reaches 200 km. The main results of the field tests of the Akvazond and preliminary scientific results of its application are presented on the basis of the results of the Black Sea-2006 expedition.  相似文献   

On-line recognition of supernova neutrino bursts in the LVD     

N.Yu. Agafonova  M. Aglietta  P. Antonioli  G. Bari  A. Bonardi  V.V. Boyarkin  G. Bruno  W. Fulgione  P. Galeotti  M. Garbini  P.L. Ghia  P. Giusti  F. Gomez  E. Kemp  V.V. Kuznetsov  V.A. Kuznetsov  A.S. Malguin  H. Menghetti  A. Pesci  R. Persiani  I.A. Pless  A. Porta  V.G. Ryasny  O.G. Ryazhskaya  O. Saavedra  G. Sartorelli  M. Selvi  C. Vigorito  L. Votano  V.F. Yakushev  G.T. Zatsepin  A. Zichichi 《Astroparticle Physics》2008,28(6):516-522

In this paper we show the capabilities of the Large Volume Detector (INFN Gran Sasso National Laboratory) to identify a neutrino burst associated with a supernova explosion, in the absence of an “external trigger”, e.g., an optical observation. We describe how the detector trigger and event selection have been optimized for this purpose, and we detail the algorithm used for the on-line burst recognition. The on-line sensitivity of the detector is defined and discussed in terms of supernova distance and intensity at the source.  相似文献   

Impact of the winter cooling on the variability of the thermohaline characteristics of the active layer in the Black Sea   总被引：1，自引：0，他引：1  

V. B. Piotukh  A. G. Zatsepin  A. S. Kazmin  V. G. Yakubenko 《Oceanology》2011,51(2):221-230

The influence of the winter atmospheric forcing on the interannual variability of the Black Sea’s active layer’s thermohaline structure during 1982–2008 is investigated. The results are based on the combined analysis of the hydrological measurements from a ship, satellite measurements of the sea’s surface temperature (SST), and the NCEP/NCAR reanalysis data for the surface air temperature (SAT). A high correlation between the variability of the winter mean SST/SAT and the thermohaline characteristics of the active layer during the following warm season was found. It is shown that the winter atmospheric forcing significantly affects the variability of the temperature, salinity, and density down to the 150–200 m depth, and this has to be considered in the analysis of the interannual and long-term variability of the Black Sea’s active layer.  相似文献   

Numerical Forecast of the Sea State Parameters Considering a Priori Nonadiabatic Sources for a Limited Marine Area     

Semenov  E. V.  Zatsepin  A. G.  Mortikov  E. V. 《Oceanology》2022,62(4):482-486

Oceanology - The study considers the formulation of the problem and performs a numerical experiment for a short-term forecast of hydrological parameters using the data of two thermohaline surveys...  相似文献   

Estimating physical parameters of cracked-porous oil reservoirs by inverting shear-wave splitting   总被引：1，自引：0，他引：1  

L. U. Brodov  A. A. Tikhonov  E. M. Chesnokov  V. V. Tertychnyi  S. V. Zatsepin 《Geophysical Journal International》1991,107(3):429-432

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160-min oscillations of the Sun as the mean of study of its internal structure     

Gavryuseva  E. A.  Kopysov  Yu. S.  Zatsepin  G. T. 《Solar physics》1983,82(1-2):209-213

The investigation of the models of the contemporary Sun with a mixed core has shown that the amplitude of some gravity modes of oscillations of the star can be mainly concentrated in the central region. This phenomenon takes place if the node of the amplitude of radial displacement coincides with the boundary of the mixed core. In this case the core can be regarded as a driving generator of the oscillations, determining their period and phase. It is suggested as the explanation of the observational properties of the 160-min oscillation.

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Modelling the compliance of crustal rock—I. Response of shear-wave splitting to differential stress     

Sergei V. Zatsepin  Stuart Crampin 《Geophysical Journal International》1997,129(3):477-494

We show that seismic shear waves may be used to monitor the in situ stress state of deep inaccessible rocks in the crust. The most widespread manifestation of the stress-related behaviour of seismic waves is the shear-wave splitting (shear-wave birefringence) observed in almost all rocks, where the polarizations of the leading split shear waves are usually subparallel to the direction of the local maximum horizontal stress. It has been recognized that such shear-wave splitting is typically the result of propagation through distributions of stress-aligned fluid-filled microcracks and pores, known as extensive-dilatancy anisotropy or EDA. This paper provides a quantitative basis for the EDA hypothesis. We model the evolution of anisotropic distributions of microcracks in triaxial differential stress, where the driving mechanism is fluid migration along pressure gradients between neighbouring microcracks and pores at different orientations to the stress field. This leads to a non-linear anisotropic poroelasticity (APE) model for the stress-sensitive behaviour of fluid-saturated microcracked rocks. A companion paper shows that APE modelling matches a range of observed phenomena and is a good approximation to the equation of state of a stressed fluid-saturated rock mass.  相似文献   

Exoelectron spectroscopy of traps in surface layers of phenakite and quartz     

V. S. Kortov  A. F. Zatsepin  V. I. Ushkova 《Physics and Chemistry of Minerals》1985,12(2):114-121

The possibilities of exoelectron spectroscopy to investigate defects in dielectrics are demonstrated for phenakite Be₂SiO₄, its structural analogs Zn₂ SiO₄, Be₂GeO₄, solid solutions Be₂Si_1?x Ge _x O₄ (x=0÷1) and α-quartz. Emission maxima at 330 and 670 K in phenakite have been found to be due to [GeO₄]^5? andE' centers, respectively. Structural disturbances in the silicon and oxygen positions have been shown to control the exoemission activity of the crystals. Radiation induced decrease of exoemission activity connected with generation ofE' centers by neutron irradiation has been discovered. The energy level scheme of active centers in the subsurface region of Be₂SiO₄ has been established.  相似文献