Ozone Content over the Russian Federation in 2019     

Ivanova  N. S.  Kruchenitskii  G. M.  Kuznetsova  I. N.  Shalygina  I. Yu.  Lapchenko  V. A.  Demin  V. I. 《Russian Meteorology and Hydrology》2020,45(3):211-218

Russian Meteorology and Hydrology - The review is compiled on the basis of the results of operation of the total ozone (TO) monitoring system in Russia and neighboring countries functioning in...  相似文献   

Precession/nutation solution consistent with the general planetary theory     

V. A. Brumberg  T. V. Ivanova 《Celestial Mechanics and Dynamical Astronomy》2007,97(3):189-210

In the present paper the equations of the translatory motion of the major planets and the Moon and the Poisson equations of the Earth’s rotation in Euler parameters are reduced to the secular system describing the evolution of the planetary and lunar orbits (independent of the Earth’s rotation) and the evolution of the Earth’s rotation (depending on the planetary and lunar evolution). Hence, the theory of the Earth’s rotation is presented by means of the series in powers of the evolutionary variables with quasi-periodic coefficients.  相似文献   

Oxide‐bearing and FeO‐rich clasts in aubrites     

E. B. Rosenshein  M. A. Ivanova  T. L. Dickinson  T. J. McCoy  D. S. Lauretta  Y. Guan  L. A. Leshin  G. K. Benedix 《Meteoritics & planetary science》2006,41(4):495-503

Abstract— We report the occurrence of an oxide‐bearing clast and an FeO‐rich clast from aubrites. The FeO‐rich clast in Pesyanoe is dominated by olivine and pyroxene phenocrysts with mineral compositions slightly less FeO‐rich than is typical for H chondrites. In Allan Hills (ALH) 84008, the oxide‐bearing clast consists of a single forsterite grain rimmed by an array of sulfides, oxides, and phosphides. We consider a number of possible origins. We can exclude formation by melting of oxide‐bearing chondrules and CAIs formed in enstatite chondrites. The Pesyanoe clast may have formed in a more oxidized region of the aubrite parent body or, more likely, is a foreign clast from a more oxidized parent body. The ALH 84008 clast likely formed by reaction between sulfides and silicates as a result of cooling, oxidation, or de‐sulfidization. This clast appears to be the first oxide‐bearing clast from an aubritic breccia that formed on the aubrite parent body. Identification of additional oxide‐bearing clasts in aubrites could shed light on whether this was a widespread phenomenon and the origin of these enigmatic objects.  相似文献   

Mechanisms controlling seasonal mixed layer temperature and salinity in the Southwestern Tropical Indian Ocean     

Daria Halkides  Tong Lee 《Dynamics of Atmospheres and Oceans》2011,51(3):77-93

We use a heat- and salt-conserving ocean state estimation product to study the seasonal cycles of the mixed layer (ML) temperature (MLT) and salinity (MLS) balances over the southwestern tropical Indian Ocean (SWTIO) thermocline ridge (STR; 50°–75°E, 12°–5°S). For seasonal MLT, surface heat flux and ocean processes are both important. They tend to re-enforce each other during peak cooling (May–June) and warming (November) periods, but not during transition periods. The dominant ocean process is wind-driven vertical mixing. It is modulated by the variable strength of the monsoon winds (which affect the vertical diffusivity), and to a lesser extent by variability of thermocline depth (which influences the vertical stratification across the ML base). For example, thermocline shoaling in April–July alters the vertical stratification near the ML base; thus, when the monsoon winds heighten (June–September) and the vertical diffusivity increases (deepening the ML base), relatively cool subsurface water is near the ML base and easily incorporated into the ML by vertical mixing. However, vertical advection as a direct response to thermocline shoaling has little affect on MLT. This explains why MLT and thermocline depth are not positively correlated here on the seasonal timescale (as they are on the interannual timescale). Meridional advection associated with Ekman transport driven by the monsoon winds plays a secondary role. Seasonal MLS, however, is dominated by meridional advection. Vertical process effects on MLS are small, due to a weak salinity gradient near the ML base throughout the year.  相似文献   

Opposition effect of Trojan asteroids     

V.G. Shevchenko  I.N. Belskaya  I.G. Slyusarev  Yu.N. Krugly  V.G. Chiorny  N.M. Gaftonyuk  Z. Donchev  V. Ivanova  M.A. Ibrahimov  Sh.A. Ehgamberdiev  I.E. Molotov 《Icarus》2012,217(1):202-208

CCD-photometry of three Jupiter Trojan asteroids were carried out to study their opposition effect. We obtained well-sampled magnitude–phase curves for (588) Achilles, (884) Priamus, and (1143) Odysseus in the maximal attainable phase angle range down to 0.1–0.2°. The magnitude–phase relations have a linear behavior in all observed range of phase angles and do not show any non-linear opposition brightening. We have not found any confident differences between phase slopes measured in B, V and R bands. The values of the measured phase slopes of Trojans are different from available data for Centaurs. They are within the range of phase slopes measured for some low-albedo main belt asteroids, also exhibit a linear behavior down to small phase angles. An absence of non-linear opposition brightening puts constraints on the surface properties of the studied objects, assuming very dark surfaces where single scattering plays dominating role.We also determined the rotation periods, amplitudes, the values of color indexes B–V and V–R, and the absolute magnitudes of these asteroids.  相似文献   

Ozone content over the Russian Federation in the third quarter of 2009     

A. M. Zvyagintsev  N. S. Ivanova  G. M. Kruchenitskii  I. N. Kuznetsova  A. A. Artamonova 《Russian Meteorology and Hydrology》2009,34(11):770-773

The review is compiled based on the results of the operation of the total ozone (TO) monitoring system in the CIS and Baltic countries, functioning in the operational regime at the Central Aerological Observatory (CAO). The monitoring system uses the data from the national network of type M-124 filter ozonometers under control of the Main Geophysical Observatory (MGO); the proper operation of the entire system is under an operational control from observations with the OMI satellite (US NASA) equipment. Basic TO observations data for each month of the third quarter of 2009 and for the quarter as a whole are generalized. Results of regular observations of the surface ozone content carried out by the CAO in the Moscow park zone are considered; they characterize to a great extent the air quality in the surface layer of the Moscow region.  相似文献   

Ozone content over the Russian federation in the first quarter of 2008     

A. M. Zvyagintsev  N. S. Ivanova  V. A. Zhuravleva  G. M. Kruchenitskii  I. Yu. Shalygina 《Russian Meteorology and Hydrology》2008,33(5):335-339

The review is compiled based on the results of the operation of the Total Ozone (TO) Monitoring System in the CIS countries, functioning in the operational regime at the Central Aerological Observatory (CAO). The monitoring system uses the data from the national network of filter ozonometers, type M-124; the proper operation of the system is confirmed by the results of comparison with the TO fields obtained from observations with the OMI satellite (US NASA) equipment. The TO observation data for each month of the first quarter of 2008 and for a quarter as a whole are generalized. Results of regular surface ozone observations that have been carried out by the CAO in the Moscow park zone since 1991 and that characterize the surface ozone state in the Moscow region are also considered.  相似文献   

Porphyry-Style Petropavlovskoe Gold Deposit,the Polar Urals: Geological Position,Mineralogy, and Formation Conditions     

I. V. Vikentyev  R. Kh. Mansurov  Yu. N. Ivanova  E. E. Tyukova  I. D. Sobolev  V. D. Abramova  R. I. Vykhristenko  A. P. Trofimov  V. B. Khubanov  E. O. Groznova  S. S. Dvurechenskaya  S. G. Kryazhev 《Geology of Ore Deposits》2017,59(6):482-520

Geological and structural conditions of localization, hydrothermal metasomatic alteration, and mineralization of the Petropavlovskoe gold deposit (Novogodnenskoe ore field) situated in the northern part of the Lesser Ural volcanic–plutonic belt, which is a constituent of the Middle Paleozoic island-arc system of the Polar Urals, are discussed. The porphyritic diorite bodies pertaining to the late phase of the intrusive Sob Complex play an ore-controlling role. The large-volume orebodies are related to the upper parts of these intrusions. Two types of stringer–disseminated ores have been revealed: (1) predominant gold-sulfide and (2) superimposed low-sulfide–gold–quartz ore markedly enriched in Au. Taken together, they make up complicated flattened isometric orebodies transitory to linear stockworks. The gold potential of the deposit is controlled by pyrite–(chlorite)–albite metasomatic rock of the main productive stage, which mainly develops in a volcanic–sedimentary sequence especially close to the contacts with porphyritic diorite. The relationships between intrusive and subvolcanic bodies and dating of individual zircon crystals corroborate a multistage evolution of the ore field, which predetermines its complex hydrothermal history. Magmatic activity of mature island-arc plagiogranite of the Sob Complex and monzonite of the Kongor Complex initiated development of skarn and beresite alterations accompanied by crystallization of hydrothermal sulfides. In the Early Devonian, due to emplacement of the Sob Complex at a depth of approximately 2 km, skarn magnetite ore with subordinate sulfides was formed. At the onset of the Middle Devonian, the large-volume gold porphyry Au–Ag–Te–W ± Mo,Cu stockworks related to quartz diorite porphyry—the final phase of the Sob Complex— were formed. In the Late Devonian, a part of sulfide mineralization was redistributed with the formation of linear low-sulfide quartz vein zones. Isotopic geochemical study has shown that the ore is deposited from reduced, substantially magmatic fluid, which is characterized by close to mantle values δ³⁴S = 0 ± 1‰, δ¹³C =–6 to–7‰, and δ¹⁸O = +5‰ as the temperature decreases from 420–300°C (gold–sulfide ore) to 250–130°C (gold–(sulfide)–quartz ore) and pressure decreases from 0.8 to 0.3 kbar. According to the data of microanalysis (EPMA and LA-ICP-MS), the main trace elements in pyrite of gold orebodies are represented by Co (up to 2.52 wt %), As (up to 0.70 wt %), and Ni (up to 0.38 wt %); Te, Se, Ag, Au, Bi, Sb, and Sn also occur. Pyrite of the early assemblages is characterized by high Co, Te, Au, and Bi contents, whereas the late pyrite is distinguished by elevated concentrations of As (up to 0.7 wt %), Ni (up to 0.38 wt %), Se (223 ppm), Ag (up to 111 ppm), and Sn (4.4 ppm). The minimal Au content in pyrite of the late quartz–carbonate assemblage is up to 1.7 ppm and geometric average is 0.3 ppm. The significant correlation between Au and As (furthermore, negative–0.6) in pyrite from ore of the Petropavlovskoe deposit is recorded only for the gold–sulfide assemblage, whereas it is not established for other assemblages. Pyrite with higher As concentration (up to 0.7 wt %) is distinguished only for the Au–Te mineral assemblage. Taking into account structural–morphological and mineralogical–geochemical features, the ore–magmatic system of the Petropavlovskoe deposit is referred to as gold porphyry style. Among the main criteria of such typification are the spatial association of orebodies with bodies of subvolcanic porphyry-like intrusive phases at the roof of large multiphase pluton; the stockwork-like morphology of gold orebodies; 3D character of ore–alteration zoning and distribution of ore components; geochemical association of gold with Ag, W, Mo, Cu, As, Te, and Bi; and predominant finely dispersed submicroscopic gold in ore.  相似文献   

Legal challenges to the management of transboundary watercourses in Central Asia under the conditions of Eurasian Economic Integration     

Daria S. Boklan  Barbara Janusz-Pawletta 《Environmental Earth Sciences》2017,76(12):437

Worldwide experience has shown that interstate economic integration can help states in strengthening of management of transboundary waters and international water law serves as a reference for developing of relevant interstate cooperation. Transboundary waters in Central Asia play important role in the economic cooperation among riparian states, including those who are members of the Eurasian Economic Union (EAEU). At the current stage of transboundary waters management in Central Asia, the obsolete legal status is evident. The international water law sources developed under the United Nations’ auspices have no binding application due to luck of formal membership of the EAEU states in these treaties. Also the regional set of regulations, especially for the Aral Sea Basin, needs further enhancement and more efficient implementation. The bilateral interstate regulatory framework of the managemennt of waters shared by EAEU states in Central Asia requires development of additional rules to enable better accommodation of challenges existing in terms of the current interstate cooperation. Having said that can one further assume that EAEU could serve as a new legal framework for more effective cooperation on transboundary watercourses in Central Asia? The answer might be yes, but… the current stage of the legal framework for cooperation on transboundary waters within the EAEU requires sufficient enhancements in terms of developing its legal and institutional framework. The first condition for EAEU to serve as framework for cooperation on transboundary waters of Central Asia is to strengthen the regulatory framework for the cooperation of EAEU member states regarding environmental issues in general and transboundary water relations in particular, able to accommodate two main goals: environmental protection on the one hand and economic development on the other hand. The EAEU legal framework shall also lead to improvement of existing institutional cooperation and a dispute settlement mechanism on transboundary waters shared by the member states of the EAEU.  相似文献   

Effect of the tangential component of a force field on convection in a rotating plane layer     

A. A. Vjatkin  A. A. Ivanova  V. G. Kozlov  K. Yu. Rysin 《Izvestiya Atmospheric and Oceanic Physics》2017,53(2):187-194

Thermal convection in an inclined plane layer having boundaries with different temperatures and rotating around an axis perpendicular to its plane is studied experimentally. It is shown that the convection and heat transfer are determined by two different convective mechanisms—gravitational and thermovibrational ones; they manifest themselves in the threshold excitation of cellular convective structures with different sizes. The thermovibrational convection is caused by the period-averaged mass force arising as a result of tidal oscillations of a nonisothermal fluid with respect to the cavity under the action of the external force-field component tangential to the layer. The map of convection regimes on the plane of governing parameters—the gravitational Rayleigh number and its vibrational analog—has been constructed. It has been found that the thermovibrational convection can develop even in a layer heated from above. The role of the dimensionless velocity of rotation, which has a stabilizing effect on the excitation of both gravitational and thermovibrational convection, has been studied.  相似文献