Methane in Water and Bottom Sediments in Three Sections in the Kara and Laptev Seas     

A. A. Vetrov  N. V. Lobus  A. N. Drozdova  N. A. Belyaev  E. A. Romankevich 《Oceanology》2018,58(2):198-204

The methane content in water and bottom sediments was measured in vertical sections: Lena River Delta–continental slope (the Laptev Sea), Taimyr Peninsula–Voronin Trough, and along the Novaya Zemlya Archipelago. The methane concentrations varied from 2.5 to 70 nmol/L and from 590 to 2600 nmol/L in the water column and sediments, respectively. Most of the surface water samples showed oversaturation in methane (up to 19-fold, fourfold on average), which determined the water–atmosphere direction of methane fluxes, which amounted to 1–400 mol/km² day (52 mol/km² day on average).  相似文献   

The bottom currents in the area of abyssal hills in the north-east tropical Pacific Ocean     

T. A. Demidova  E. A. Kontar'  A. V. Sokov  A. M. Belyaev 《Physical Oceanography》1993,4(1):53-61

The results of simultaneous measurements of the bottom (6.25 and 35 m above the bottom) currents, deep currents, and surface currents made at three points in the north-east tropical Pacific Ocean are given. The bottom intensification of the current velocity is revealed in a layer of 35–25 m above the bottom. The estimation of the thickness of the bottom boundary layer (BBL) indicates that the velocity intensification is observed over the boundary layer upper border. A 10-day long benthic storm with a maximum measured velocity of 13 cm/s was revealed 6 m above the bottom. As was found, the origin of the benthic storm is associated with the penetration of an anticyclonic eddy down to the bottom.Translated by Mikhail M. Trufanov.  相似文献   

Numerical Simulations of Magnetized Astrophysical Jets and Comparison with Laboratory Laser Experiments     

V. S. Belyaev  G. S. Bisnovatyi-Kogan  A. I. Gromov  B. V. Zagreev  A. V. Lobanov  A. P. Matafonov  S. G. Moiseenko  O. D. Toropina 《Astronomy Reports》2018,62(3):162-182

The results of MHD numerical simulations of the formation and development of magnetized jets are presented. Similarity criteria for comparisons of the results of laboratory laser experiments and numerical simulations of astrophysical jets are discussed. The results of laboratory simulations of jets generated in experiments at the Neodim laser installation are presented.  相似文献   

Evolution of the Landscape of the Western Part of the Turan–Uyuk Basin (Tuva Highland) in the Late Pleistocene     

Belyaev  Yu. R.  Panin  A. V.  Kiryuhina  A. D.  Koshurnikov  A. V.  Kramynin  A. M.  Pavlov  M. A.  Konstantinov  E. A.  Kurbanov  R. N.  Zakharov  A. L.  Sychev  N. V. 《Doklady Earth Sciences》2022,506(1):S84-S93

Doklady Earth Sciences - A complex of works including geomorphological deciphering, field survey, drilling, electric prospecting, and dating of deposits using the radiocarbon method and optically...  相似文献   

Prospects of Antarctica for finding economic apatite deposits     

E. V. Belyaev 《Doklady Earth Sciences》2014,455(2):368-369

An assessment of the prospects of apatite mineralization with brief characteristic of the expected geological-industrial types, composition, and mineralogical-technological parameters of ores of the forecast deposits is given for the major tectonic structures of Antarctica. The main prospects are related to the rift (protorift, greenstone, and rift) zones of the Antarctic shield.  相似文献   

Laboratory investigations of the thermal strain of frozen soils, using fiber-optic strain gauges based on Bragg gratings     

Aleksey Marchenko  Nicolai Vasiliev  Artem Nesterov  Yuri Kondrashov  Nikolay Belyaev 《寒旱区科学》2017,9(3):192-196

Measurements of the thermal deformations of frozen soil samples were performed in the cold laboratory in temperature range from 0°C to-12°C.Fiber Bragg Gratings strain and temperature sensors were used to measure the deformation and temperature inside the samples.A number of tests with the samples prepared from Kaolin and Cambrian clay saturated with fresh water,and prepared from fine and silt sand saturated with fresh or saline water,are performed.Thermal deformations of the samples are analyzed depending on the cyclic changes of their temperature.  相似文献   

Biogeochemical processes in the Chukchi Sea     

A. Yu. Lein  A. S. Savvichev  I. I. Rusanov  G. A. Pavlova  N. A. Belyaev  K. Craine  N. V. Pimenov  M. V. Ivanov 《Lithology and Mineral Resources》2007,42(3):221-239

Study of biogeochemical processes in water and sediments of the Chukchi Sea in August 2004 revealed atypical maximums of the concentration of biogenic elements (N, P, and Si) and the rate of microbial sulfate reduction in the surface layer (0–3 cm) of marine sediments. The C: N: P ratio in the organic matter (OM) of this layer does not fit the Redfield-Richards stoichiometric model. Specific features of biogeochemical processes in sea are likely related to the complex dynamics of water, high primary productivity (110–1400 mg C/(m² day)), low depth of basin (<50 m in 60% of the water area), reduced food chain due to low population of zooplankton, high density of zoobenthos (up to 4230 g m^?2), and high activity of microbial processes. Drastic decrease in the concentration of biogenic elements, iodine, total alkalinity (Alk), and population of microorganisms beneath the 0–3 cm layer testify to a large-scale OM decay at the water-seafloor barrier. Our original experimental data support the high annual rate of OM mineralization at the bottom of the Chukchi Sea.  相似文献   

On the oceanic impact of a data-assimilation method in a coupled ocean-land-atmosphere model     

Clemente A. S. Tanajura  Konstantin P. Belyaev 《Ocean Dynamics》2002,52(3):123-132

 Based on the Kalman filter theory, a new data-assimilation method has been used to improve the 3-D oceanic temperature field of the Center for Ocean-Land-Atmosphere Studies (COLA) coupled general circulation model. This method is applied to assimilate surface and subsurface temperature of in situ measurements from the Pilot Research Moored Array in the Tropical Atlantic project (PIRATA). The assimilation of the PIRATA data produces an improved representation of the thermal state of the ocean and allows a better estimation of other oceanographic quantities, like meridional heat fluxes and zonal currents. The present paper focuses on the tropical Atlantic and, in particular, it contains new reconstructed temperature profiles. One-month forecast experiments during 1999 were performed and the impact of the assimilation is discussed. Received: 24 April 2001 / Accepted: 8 March 2002  相似文献   

Influence of Biogenous Elements on Components of the Lake Baikal Plankton Community     

E. A. Silow  D. J. Stom  N. A. Basharova  A. A. Belyaev  N. A. Buntina  O. A. Burlakova  T. A. Dzuban  E. N. Ermakova  N. A. Zausaeva  A. I. Spivak  T. G. Khramtzova  G. V. Shahova  N. G. Sheveleva  N. A. Shestakova 《洁净——土壤、空气、水》1991,19(6):629-634

Fertilization experiments in mesocosms of 1 … 2,000 1 containing up to 0.32 mg/l P and 1.7 mg/l N in summer and in winter did not show any significant changes of the hydrochemical conditions and in the bacterio-plankton. CO₂-assimilation (14-C method) is reduced by circa 10= by nutrient doses, whereas the chlorophyll concentration increases significantly due to addition of P and N at the same time in summer, a decrease taking place in winter. The different courses of development are connected with different reactions of individual species of phytoplankton.  相似文献   

Water balance and water resources of the Aral sea basin and its man-induced changes     

A. V. Belyaev 《GeoJournal》1995,35(1):17-21

Presented natural-climatological characteristics of water resources forming conditions of the Aral sea basin. Analised flow variability correlation of Amy Darya and Syr Darya from the point of their influence on the sea level fluctuation.Shows up the tendences of structural changes and efficiency of water resources usage of the region, presents their present-day spacial-geographical peculiarities.On the basis of temporal analysis of water balance structure of the Aral Sea, forming processes of river flow and its discharge a conclusion about quantative correlation of natural and anthropogenic components of sea level degradation is made.  相似文献