First data on the distribution of platinum group elements (Ir,Os, Ru,Pt, and Pd) and Re in island-arc basalts of Kamchatka     

A. V. Ivanov  A. B. Perepelov  S. V. Palesskii  I. V. Nikolaeva 《Doklady Earth Sciences》2008,420(1):597-601

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Modeling of wind upwellings on the northwest shelf of the Black Sea near local features of the bottom topography     

V. A. Ivanov  É. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》2008,18(3):168-178

We discuss the results of numerical experiments aimed at the investigation of the process of formation of the three-dimensional structure of the zones of upwelling on the northwest shelf of the Black Sea depending on the direction of the wind. We perform the detailed analysis of three zones (I, II, and III) with fairly well pronounced inhomogeneities of the bottom topography. Zone I is located in the north part of the shelf and, in this region, we observe a narrow depression to the southwest of the Tendrovskaya Spit. In zone II located in the near-Danube zone, we observe a height reaching the sea surface (Zmeinyi Island). Zone III is located in the east part of the shelf and corresponds to a sharp drop of depths with specific curvature of the coastal line of the Kalamitskii Bay and Gerakleiskii Peninsula. The performed analysis enables us to conclude that, in the vicinity of the local features of the bottom topography and coastal line (such as underwater heights, depressions, and capes), we observe the appearance of the zones of upwelling of waters, especially pronounced in the deep-water layers of the sea. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 3, pp. 68–80, May–June, 2008.  相似文献   

Simulation of surge phenomena and transformation of the admixture field in the Sea of Azov in the presence of stationary currents     

V. A. Ivanov  V. V. Fomin  L. V. Cherkesov  T. Ya. Shul’ga 《Physical Oceanography》2008,18(4):212-226

Using a three-dimensional nonlinear mathematical model, we study the processes of transfer and diffusion of contaminants in the Sea of Azov in the presence of stationary currents. Changes in the sea level, surge phenomena, and the direction and velocity of stationary currents caused by winds with different maximum velocities are analyzed. We estimate the region of applicability of the linear approximation and the choice of the value of integration steps over space and time coordinates. It is shown that the growth of the maximum wind velocity increases the contaminated domains and the time of complete dispersion of the admixture. Solutions obtained in the linear approximation differ slightly from those obtained by using the nonlinear model for wind velocities up to 5 m/sec. Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 52–68, July–August, 2008.  相似文献   

Features of the spatial distribution of spots in the solar cycle and a model of dynamo in a thin layer     

V. G. Ivanov  E. V. Miletsky 《Geomagnetism and Aeronomy》2015,55(8):1076-1080

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Shelf-basin exchange in the Laptev Sea in the warming climate: a model study     

Vladimir Ivanov  Pavel Maslov  Yevgeny Aksenov  Andrew Coward 《地球物理与天体物理流体动力学》2015,109(3):254-280

GCM-based forecast simulations predict continuously increasing seasonality of the sea ice cover and an almost ice-free, summer-time, Arctic Ocean within several decades from the present. In this study we use a primitive equation ocean model: NEMO, coupled with the sea ice model LIM2, to test the hypothesis that under such an increased range in seasonal ice cover the intensity of shelf-basin water exchange will significantly increase. We use the simulated results for the Laptev Sea from a global model run 1958–2007 and compare results for two years with anomalously high and low summer sea ice extents: 1986–1987 and 2006–2007. The shelf–basin fluxes of volume, heat and salt during specific seasons are evaluated and attributed to plausible driving processes, with particular attention to dense water cascading. Analyses of the model temperature distribution at the depth of the intermediate maximum, associated with Atlantic Water, have shown a marked increase of the amount of the local origin cold water in late winter 2007 in the region, where dense water typically appears as a result of its formation on the shelf and subsequent downslope leakage. Calculation of the shelf-basin exchange during March-May in both years confirmed a substantial increase (a factor of two) of fluxes in “ice-free” 2007 compared to the “icy” 1987. According to several past model studies, dense water production on Arctic shelves in winter driven by ice freezing and brine rejection is not likely to cease in a warmer climate, but rather to increase. There is also observational evidence that cascading in the seasonally ice covered seas (e.g. the Barents Sea) is much more efficient than it is in the permanently ice covered Arctic Ocean, which supports these model results.  相似文献   

Cyclonic circulation and upwelling in Lake Baikal   总被引：1，自引：0，他引：1  

Elena Troitskaya  Vadim Blinov  Vyacheslav Ivanov  Andrey Zhdanov  Ruslan Gnatovsky  Ekaterina Sutyrina  Mikhail Shimaraev 《Aquatic Sciences - Research Across Boundaries》2015,77(2):171-182

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Investigation of the relative abundance of one-fold neutrons in an incident flux of the cosmic rays from neutron monitors data     

N. A. Ivanov 《Kinematics and Physics of Celestial Bodies》2008,24(6):293-295

The behaviour of relative content of one-fold neutrons in the incident flux of cosmic rays during Forbush-decreases and solar cosmic ray flares is considered based on the network of cosmic ray stations. The barometric dependence of this value on the network of cosmic ray stations. The barometric dependence of this value on the latitude and see level altitude of a cosmic ray station is obtained.  相似文献   

Catalog of stars with the big proper motion     

G. A. Ivanov 《Kinematics and Physics of Celestial Bodies》2008,24(6):334-336

The catalogue (astrometric and astrophysical parameters) of 555200 stars with high proper motions (more than 0.04″/year) was compiled on the basis of original definitions from the catalogues FONAK1.1, Hipparcos, Tycho-2, UCAC2, CMC (STAR 11), PPM, NPM1, NPM2, XZ80Q, Pul-3, Pul2, NLTT, GCVS, LHS, Lowell Proper Motion Service, and Bruce Proper Motion Service as well as of the information from about 770 other published sources—ftp://ftp.mao.kiev.ua/pub/astro/h-pms2.dat.  相似文献   

Active filaments as the main source of the solar wind plasma in the Earth’s orbit     

K. G. Ivanov 《Geomagnetism and Aeronomy》2007,47(3):273-284

The works on the relations of active filaments to geomagnetic disturbances, performed in 1953–1974 in the Geophysical Institute of Czechoslovakia [Bednarova-Novakova and Halenka, 1974], and to interplanetary MHD disturbances, performed in 1996–2006 in IZMIRAN by the author of this work with the collaborators, are briefly reviewed. The results of these works form the basis for the conclusion that the coronal-chromospheric plasma related to active filaments is the main source of plasma in the solar wind streams in the Earth’s orbit.  相似文献   

Comparison of the sector and conventional spherical harmonic analyses of the solar magnetic field on the photosphere,source surface,and in the Earth’s orbit on July 10–20, 2004     

K. G. Ivanov  A. F. Kharshiladze 《Geomagnetism and Aeronomy》2016,56(1):125-128

The results of a spherical harmonic analysis and a sector spherical harmonic analysis of the solar magnetic field on the photosphere, source surface, and in the Earth’s orbit on July 10–20, 2004, were compared. It was found that the field values according to a sector harmonic analysis are an order of magnitude as large as the same values according to a spherical harmonic analysis and differ in the configuration. A twocomponent magnetic field structure was revealed: short-range sources are better described by a sector spherical harmonic analysis; long-range sources are better described by a spherical harmonic analysis. This is caused by the different depths of the occurrence of sources below the photosphere.  相似文献