Mercury in the Water of Small Rivers of the Onega Bay Basin of the White Sea     

Fedorov  Yu. A.  Ovsepyan  A. E.  Savitsky  V. A.  Zimovets  A. A.  Dotsenko  I. V. 《Doklady Earth Sciences》2019,487(1):804-806

Doklady Earth Sciences - The results of expeditionary studies of the behavior of mercury in the water of small rivers in the basin of Onega Bay of the White Sea are presented. The priority forms of...  相似文献   

Role of the Radiation Factor in Global Climatic Events of the Late Holocene     

Fedorov  V. M.  Frolov  D. M.  Velasco Herrera  V. M. N.  Soon  W. W.-H.  Cionco  R. G. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(10):1239-1253

Izvestiya, Atmospheric and Oceanic Physics - On the basis of calculations of insolation and insolation characteristics, taking into account changes in solar activity, the causes of global climatic...  相似文献   

Field Simulation of Cadmium Pollution of a Freshwater Body     

D. N. Gar’kusha  Yu. A. Fedorov  T. V. Knyazeva  N. S. Tambieva 《Water Resources》2018,45(5):746-756

An experiment in mesocosms installed in a fish-rearing pond was used to adequately simulate the character of self-purification, migration, and the redistribution of cadmium and its chemical forms in major components of a freshwater ecosystem, into which this chemical is imported in concentrations far in excess of its MAC. The major portion of the imported cadmium was found to be removed from the water mass within a few days, mostly, as a component of particulate matter settling onto the bed, including dead plankton remains, as ion-exchange cadmium forms adsorbed by suspension (37%), and as forms associated with ferromanganese oxides (41%). The rate of cadmium removal from the water mass is determined both by the amount of particulate matter settling onto the bed and the efficiency of cadmium sorption by it, depending on the acid–alkaline and redox conditions in the water body.  相似文献   

Sulfide Sulfur in Water Objects with Different Mineralization     

Fedorov  Yu. A.  Mikhailenko  A. V.  Dotsenko  I. V. 《Water Resources》2019,46(2):S59-S64

Water Resources - Hydrogen sulfide, like other sulfides, is formed in aquatic environments due to sulphate reduction processes and putrefactive decomposition of organic matter of bottom sediments,...  相似文献   

Oil components in the mouth area of the Don R. and in the Sea of Azov: Results of many-year studies     

A. N. Kuznetsov  Yu. A. Fedorov 《Water Resources》2014,41(1):55-64

The data given are the results of many-year studying the distribution of the concentrations of main oil components (hydrocarbons, surfactants, and asphaltene-tarry substances) in the water mass, vertically settling particulate matter, and bottom sediment cores taken from the section Lower Don-The Gulf of Taganrog-Russian sector of the Sea of Azov in summer and autumn periods in 2006–2011. Spatial and seasonal regularities in the distributions of the total concentration of oil components and the values of their ratios in water, as well as the spatial and annual features of their accumulation in bottom sediments have been established. Radiological methods have been used for layer-by-layer dating of bottom sediment cores and determine the thickness of the layer that had formed under the maximal anthropogenic impact on ecosystems. The presence of considerable amounts of hydrocarbons of modern biological origin has been revealed in all components of examined aquatic complexes.  相似文献   

Currents in the Drake Passage by the observations in October–November of 2011     

M. N. Koshlyakov  S. V. Gladyshev  R. Yu. Tarakanov  D. A. Fedorov 《Oceanology》2013,53(1):1-12

The currents in the Drake Passage are studied from the ADCP and CTD data acquired in a section across the Drake Passage in October-November of 2011 and from the satellite altimeter data. A complicated pattern of currents including eight jets of the Antarctic Circumpolar Current (ACC) and a system of slope and abyssal currents was found. The most interesting result is the discovery of several cyclonic and anticyclonic mesoscale eddies confined to the abyss. Some reasons explaining the generation of such eddies by the meandering of the ACC jets in the upper ocean layer are presented.  相似文献   

Global stability of the ballooning mode in a cylindrical model     

N. G. Mazur  E. N. Fedorov  V. A. Pilipenko 《Geomagnetism and Aeronomy》2013,53(4):448-456

Ballooning disturbances in a finite-pressure plasma in a curvilinear magnetic field are described by the system of coupled equations for the Alfvén and slow magnetosonic modes. In contrast to most previous works that locally analyzed the stability of small-scale disturbances using the dispersion relationship, a global analysis outside a WKB approximation but within a simple cylindrical geometry, when magnetic field lines are circles with constant curvature, is performed in the present work. This model is relatively simple; nevertheless, it has the singularities necessary for the formation of the ballooning mode: field curvature and non-uniform thermal plasma pressure. If the disturbance finite radial extent is taken into account, the instability threshold increases as compared to a WKB approximation. The simplified model used in this work made it possible to consider the pattern of unstable disturbances at arbitrary values of the azimuthal wavenumber (k _y ). Azimuthally large-scale disturbances can also be unstable, although the increment increases with decreasing azimuthal scale and reaches saturation when the scales are of the order of the pressure nonuniformity dimension.  相似文献   

Nature and age of metamorphic rocks from the basement of the West Siberian megabasin (according to U-Pb isotopic dates)     

K. S. Ivanov  Yu. N. Fedorov  V. S. Ponomarev  V. A. Koroteev  Yu. V. Erokhin 《Doklady Earth Sciences》2012,443(1):321-325

The SHRIMP-II zircon U-Pb dates for metamorphic rocks from the West Siberian basement are determined for the first time. It is established that the major protolith of the metamorphic strata from the Shaimsk-Kuznetsovsk meganticlinorium is composed of sedimentary Late- and Middle-Devonian rocks (395–398 Ma). It is likely that the greywackes, whose strata were mainly formed under erosion of ophiolitic rocks, served as a substrate for the metamorphic rocks. The metamorphic transformations of the rocks occurred under conditions of greenschist and occasionally lower amphibolite facies of metamorphism during the Late Carboniferous-Early Permian period.  相似文献   

Helicopter Crash on the Spitsbergen Archipelago: Infrasound and Seismic Signals Decryption     

Vinogradov  Yu. A.  Fedorov  A. V. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(7):779-784

Izvestiya, Atmospheric and Oceanic Physics - A Convers Avia Airline Mi-8 helicopter crashed near the Russian settlement of Barentsburg on October 26, 2017. The moment of impact was recorded by the...  相似文献   

Steric Level Fluctuations and Deep Convection in the Labrador and Irminger Seas     

Belonenko  T. V.  Fedorov  A. M. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1039-1049

Izvestiya, Atmospheric and Oceanic Physics - The paper considers steric level fluctuations in the northern Atlantic Ocean. We use a method that combines AVISO altimetry and GRACE gravity...  相似文献