Organic matter in the bottom sediments of the Ob Bay: Distribution,nature, and sources   总被引：1，自引：0，他引：1  

V. I. Petrova  G. I. Batova  A. V. Kursheva  I. V. Litvinenko  D. A. Konovalov 《Geochemistry International》2010,48(2):140-151

The lateral variability of main geochemical parameters of dispersed organic matter (DOM) in the bottoms sediments of the Ob Bay was studied using materials of areal geological survey. It was found that they correspond to background compositions of estuarine-delta facies of the Western Arctic shelf, being mainly determined by the influx of river run-off and coastal abrasion. The distribution of DOM and its components is controlled by the hydrodynamic regime of the water area and grain-size composition of sediments. The molecular composition of hydrocarbon markers (n-alkanes, cyclanes, and arenes) confirms the dominant role of terrigenous humic material in the formation of DOM of the bottom sediments, while temporal stability of quantitative and qualitative geochemical characteristics indicates the stability of the Ob Bay ecosystem.  相似文献   

Assessment of Chemical Input into the Drainage Network from Karelian River Basins     

P. A. Lozovik  M. I. Basov  A. V. Litvinenko 《Water Resources》2005,32(5):532-536

Outflow of chemical substances from the catchment area of the Karelian drainage network is discussed using hydrochemical data obtained in more than 80 rivers of Karelia over the period of many years. Weighted average characteristics of river water composition were found for ten large basins and for the entire region. Specific outflow was defined and its value was compared with atmospheric chemical precipitation; the difference made it possible to reveal the real input of chemicals from the catchment areas of Karelia.  相似文献   

Magnetic reconnection in the temperature minimum region and prominence formation     

Yu. E. Litvinenko  B. V. Somov 《Solar physics》1994,151(2):265-270

Magnetic reconnection at the photospheric boundary is an essential part of some theories for prominence formation. We consider a simple model for reconnection in this region. Parameters of the reconnecting current sheet are expressed in terms of the concentration and temperature of the outside dense and cold plasma, magnetic field intensity, and velocity of convective flows at the photosphere. The reconnection process is shown to be most efficient in a layer several hundred kilometers thick coinciding with the temperature minimum region of the solar atmosphere. The calculated upward flux of matter through the current sheet ( 10¹¹–10¹² g s^–1) is amply sufficient for prominence formation in the upper chromosphere or lower corona.  相似文献   

Hydrogeochemical Zoning of the River Network of Kamchatka     

Litvinenko  Yu. S.  Zakharikhina  L. V. 《Water Resources》2020,47(2):269-281

Water Resources - The hydrogeochemical features of river water in different parts of Kamchatka Peninsula have been identified in terms of a wide (57) range of macro- and microelements by...  相似文献   

An investigation of the Cassiopeia A radio-image in the decameter range     

A. V. Megn  S. Ya. Braude  S. L. Rashkovsky  V. A. Shepelev  N. K. Sharykin  V. V. Galanin  O. A. Litvinenko  G. A. Inyutin  A. D. Khristenko  G. S. Podgorny 《Astrophysics and Space Science》1993,201(1):79-90

The observation results of the supernova remnant Cassiopeia A, obtained with the aid of two decameter radio interferometers at 20 and 25 MHz, are presented. The so obtained dependences of the visibility function modulus on the hour angle are compared with calculations based on the brightness distribution measurements of this source using the VLA at 1381 MHz. Discrepancies between the experimental data and the calculations considerably increase with the decrease in the frequency. It is suggested that interstellar medium absorption, causing a distortion in the source spectrum over the decameter range, may be responsible for changes in the Cas A brightness distribution at these frequencies as well.  相似文献   

Estimation of Extreme Sea Level in the Akkuyu Nuclear Power Plant Area     

Kabatchenko  I. M.  Kulikov  E. A.  Litvinenko  G. I.  Filippov  Yu. G. 《Russian Meteorology and Hydrology》2020,45(1):39-44

Russian Meteorology and Hydrology - Possible extreme fluctuations of sea level in the area of the Akkuyu nuclear power plant induced by tsunami, wind, waves, and tides are discussed. The...  相似文献   

Kriging and Spatial Design Accelerated by Orders of Magnitude: Combining Low-Rank Covariance Approximations with FFT-Techniques     

W. Nowak  A. Litvinenko 《Mathematical Geosciences》2013,45(4):411-435

Computational power poses heavy limitations to the achievable problem size for Kriging. In separate research lines, Kriging algorithms based on FFT, the separability of certain covariance functions, and low-rank representations of covariance functions have been investigated, all three leading to drastic speedup factors. The current study combines these ideas, and so combines the individual speedup factors of all ideas. This way, we reduce the mathematics behind Kriging to a computational complexity of only $\mathcal{O}(dL^{*} \log L^{*})$ , where L ^? is the number of points along the longest edge of the involved lattice of estimation points, and d is the physical dimensionality of the lattice. For separable (factorized) covariance functions, the results are exact, and nonseparable covariance functions can be approximated well through sums of separable components. Only outputting the final estimate as an explicit map causes computational costs of $\mathcal{O}(n)$ , where n is the number of estimation points. In illustrative numerical test cases, we achieve speedup factors up to 10⁸ (eight orders of magnitude), and we can treat problem sizes of up to 15 trillion and two quadrillion estimation points for Kriging and spatial design, respectively, within seconds on a contemporary desktop computer. The current study assumes second-order stationarity and simple Kriging on a regular, equispaced lattice, without working with restricted neighborhoods. Extensions to many other cases are straightforward.  相似文献   

Zoning and geochemical characterization of volcanic soils on Kamchatka     

Yu. S. Litvinenko  L. V. Zakharikhina 《Geochemistry International》2009,47(5):463-475

The paper presents the first data on the zoning of modern volcanic soils on the Kamchatka Peninsula according to the age and composition of volcanic ashes in which the surface organogenic horizons of the soils were formed. The following soil provinces are recognized: Northern, Central, Western, and Southeastern. Parameters of their regional geochemical background (concentrations of trace elements) are determined. The main factor controlling the background concentrations of trace elements in these soils is the composition of the ashes underlying the soils. The geochemical specifics of the surface organogenic horizons of volcanic soils on Kamchatka may be variably affected only by the concentrations of trace elements whose average contents in magmatic rocks are the highest: Cr, Cu, Mn, Sc, Zn, Co, V, and Ag. The maximum concentrations of excess elements were determined in the soils underlain by ashes of basic composition, and the minimum concentrations of these elements occur in the soils formed in silicic ashes. All soil provinces recognized on Kamchatka are characterized by pervasively elevated Cu concentrations. It is proposed to identify volcanic soils formed in the peninsula in ashes of various composition with the application of a multiplicative geochemical coefficient.  相似文献   

Geochemistry of polycyclic aromatic hydrocarbons in the bottom sediments of the eastern Arctic shelf     

V. I. Petrova  G. I. Batova  A. V. Kursheva  I. V. Litvinenko  V. M. Savinov  T. N. Savinova 《Oceanology》2008,48(2):196-203

Sources and pathways of supply of polycyclic aromatic hydrocarbons (PAH) in the surface sediments of the Laptev and East Siberian seas were identified based on an analysis of the lithological-geochemical characteristics and distribution of organic matter (OM). The distribution of organic carbon, humic acids, bitumoids, and hydrocarbons demonstrates the determining role of the riverine runoff in the formation of the recent sediments. The total average content of PAH in the sediments of this region approximates 37 ng/g, not exceeding 80 ng/g of dry sediment. The biogenic components of the PAH (alkylphenanthrenes, alkylchrysenes, perylene) dominate in the estuarine-shelf and coastal-shelf sediments enriched with plant detritus and significantly decrease in the pelagic zone. The anthropogenic influence is observed in sediments of the port of Tiksi, where the total content of PAH with dominant pyrogenic components is two orders of magnitude higher as compared with the background values in the study region.  相似文献   

A strong limitation on the rapidity of flux-pile-up reconnection     

Y. E. Litvinenko  T. G. Forbes  E. R. Priest 《Solar physics》1996,167(1-2):445-448

The reconnection rate which can be achieved in the steady-state flux-pile-up regime is severely limited by the gas pressure of the plasma. Using the family of solutions obtained previously by Priest and Forbes, we show that the Alfvén Mach number of the plasma flowing towards the reconnection site cannot exceed _e/(8 ln R _me), where _e and R _me are the plasma and magnetic Reynolds numbers at large distance. This limit corresponds to a very weak flux-pile-up, and it is a factor of _e slower than the maximum Petschek rate. Thus the maximum flux-pile-up reconnection rate in the corona is at least two orders of magnitude smaller than the rate implied by flare observations.  相似文献