Changes in the summertime atmospheric circulation over East Asia and formation of long-lasting low-water periods within the Selenga river basin     

T. V. Berezhnykh  O. Yu. Marchenko  N. V. Abasov  V. I. Mordvinov 《Geography and Natural Resources》2012,33(3):223-229

We examine the formation patterns of the low-water periods 1976?C1982 and 1996?C2011 for the Selenga river. One of the immediate reasons for the low-water periods under consideration is the attenuation of the circulation in the zone of convergence of monsoon flows and mid-latitude flows over Mongolia and North China. Unlike the low-water periods of the preceding decades, a decrease in precipitation amounts during the current low-water period is taking place concurrently with large-scale climatic changes.  相似文献   

Connection between the variability of BL Lac in the radio and optical ranges     

V. N. Belov  V. A. Gagen-Torn  S. G. Marchenko 《Astrophysics》1989,30(1):1-6

Leningrad State University. Translated from Astrofizika, Vol. 30, No. 1, pp. 7–14, January–February, 1989.  相似文献   

Evolution of the Earth's principal axes and moments of inertia: the canonical form of solution   总被引：4，自引：0，他引：4  

A. N. Marchenko  O. A. Abrikosov 《Journal of Geodesy》2001,74(9):655-669

 Harmonic coefficients of the 2nd degree are separated into the invariant quantitative (the 2nd-degree variance) and the qualitative (the standardized harmonic coefficients) characteristics of the behavior of the potential V ₂(t). On this basis the evolution of the Earth's dynamical figure is described as a solution of the time-dependent eigenvalues–eigenvectors problem in the canonical form. Such a canonical quadratic form is defined only by temporal variations of the harmonic coefficients and always remains finite, even within an infinite time interval. An additional condition for the correction or the determination of temporal variations of the 2nd degree is obtained. Temporal variations of the fully normalized sectorial harmonic coefficients are estimated in addition to ˙Cˉ ₂₀, ˙Cˉ ₂₁, and ˙Sˉ ₂₁ of the EGM96 gravity model. In addition, a non-linear hyperbolic model for Cˉ _2m (t), Sˉ _2m (t) is constructed. The trigonometric form of the hyperbolic model leads to the consideration of the potential V ₂(ψ) instead of V ₂(t) within the closed interval −π/2≤ψ≤+π/2. Thus, it is possible to evaluate the global trend of V ₂(t), the Earth's principal axes and the differences of the moments of inertia within the whole infinite time interval. Received: 25 September 1998 / Accepted: 28 June 2000  相似文献   

On the excitation of resonant double Kelvin waves in the Barents Sea Opening     

Yoshie Kasajima  Aleksey Marchenko 《Polar research》2001,20(2):241-248

In the northern Barents Sea Opening (BSO) the K₁ tidal energy is predominant in the diurnal tidal frequency band, suggesting the generation of a topographic wave with the K₁ tidal frequency. Tidal energy of the K₁ component becomes strong where bottom topography undulates in the BSO and the scale of the undulation is close to the wavelength of the K₁ wave. An analytical model is developed to investigate the energy enhancement mechanism of the tidally induced topographic wave due to a resonance between tidal current, a topographic wave and periodic topography. The wave excited by the resonance is identified as a resonant double Kelvin wave (DKW) and the significant K₁ energy in the BSO could be due to the excitation of the resonant DKW.  相似文献   

On the problem of the formation of the Greenland sea convective gyre     

P. V. Bogorodsky  A. V. Marchenko  I. A. Podgorny 《Physical Oceanography》1993,4(1):75-79

The transformation of the interfaces of a rotating three-layer fluid is described through a simple hydrodynamic model using the shallow-water approximation. Using the Greenland sea gyre as an example, it is shown that a cyclonic circulation results in the oncoming deflection of the upper and lower layers, which favours the development of deep convection.Translated by Mikhail M. Trufanov.  相似文献   

Recent changes in the active layer thickness across the northern hemisphere   总被引：1，自引：0，他引：1  

Dongliang Luo  Qingbai Wu  Huijun Jin  Sergey S. Marchenko  Lanzhi Lü  Siru Gao 《Environmental Earth Sciences》2016,75(7):555

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Groundwater Table Formation in the Coastal Zone over a Bed with Arbitrary Shape     

V. V. Zhmur  Yu. V. Fomin  A. V. Marchenko 《Water Resources》2018,45(4):553-559

The impact of tidal wave on a permeable shore consisting of porous material results in groundwater table lying above the average sea level. This effect, stemming from the nonlinearity of the process of seawater flow in the soil, is referred to as pumping effect.  相似文献   

Orbitally modulated dust formation by the WC7+O5 colliding-wind binary WR 140     

P. M. Williams  S. V. Marchenko  A. P. Marston  A. F. J. Moffat  W. P. Varricatt  S. M. Dougherty  M. R. Kidger  L. Morbidelli  M. Tapia 《Monthly notices of the Royal Astronomical Society》2009,395(3):1749-1767

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Evaluation of LPM permafrost distribution in NE Asia reconstructed and downscaled from GCM simulations     

Kazuyuki Saito  Sergei Marchenko  Vladimir Romanovsky  Amy Hendricks  Nancy Bigelow  Kenji Yoshikawa  John Walsh 《Boreas: An International Journal of Quaternary Research》2014,43(3):733-749

A high‐resolution map of potential frozen ground distribution in NE Asia (90–150°E, 25–60°N) at the period of the Last Permafrost Maximum (LPM, c. 21 000 years ago) was dually reconstructed by means of a statistical classification using air freezing and thawing indices and a topographical downscaling using a digital relief model (ETOPO1). Background LPM climate data were derived from global climate model simulations of the Paleoclimate Model Intercomparison Project, Phase II (PMIP2). The reconstructed LPM map shows the southward shift of the southern limit of climate‐driven permafrost by 400–1500 km, with the greatest advance in the western sector (90–110°E), encompassing an area from central Siberia to most of the Altai area. The advance of environmentally conditional permafrost and seasonally frozen ground was greatest in the eastern sector (110–150°E), with an average shift of about 450 km. The descent of the lower limit of LPM alpine permafrost was in the range of 400–800 m. A comparison of the reconstructed map with published literature shows that this method, simplistically constructed yet effectively recognizing seasonality, continentality and topography, captures local features better than more elaborate methods. The sensitivity examination of a constant atmospheric lapse rate shows that altitudes of 2000–5000 m a.s.l. were most sensitive, though with only a limited effect on overall LPM distribution.  相似文献   

Estimation of the gravitational potential energy of the earth based on different density models     

Alexander N. Marchenko  Alexander S. Zayats 《Studia Geophysica et Geodaetica》2011,55(1):35-54

The estimation of the Earth’s gravitational potential energy E was obtained for different density distributions and rests on the expression E = − (W_min + ΔW) derived from the conventional relationship for E. The first component W_min expresses minimum amount of the work W and the second component ΔW represents a deviation from W_min interpreted in terms of Dirichlet’s integral applied on the internal potential. Relationships between the internal potential and E were developed for continuous and piecewise continuous density distributions. The global 3D density model inside an ellipsoid of revolution was chosen as a combined solution of the 3D continuous distribution and the reference PREM radial piecewise continuous profile. All the estimates of E were obtained for the spherical Earth since the estimated (from error propagation rule) accuracy σ_E of the energy E is at least two orders greater than the ellipsoidal reduction and the contribution of lateral density inhomogeneities of the 3D global density model. The energy E contained in the 2nd degree Stokes coefficients was determined. A good agreement between E = E_Gauss derived from Gaussian distribution and other E, in particular for E = E_PREM based on the PREM piecewise continuous density model and E-estimates derived from simplest Legendre-Laplace, Roche, Bullard and Gauss models separated into core and mantle only, suggests the Gaussian distribution as a basic radial model when information about density jumps is absent or incomplete.  相似文献