Chemical Composition of Bottom Sediments of the Zeya and Selemdzha Rivers as a Reflection of Drainage Area Weathering     

O. A. Sorokina  M. N. Gusev 《Geochemistry International》2018,56(4):378-396

This paper reports the results of chemical study of bottom sediments of the Zeya and Selemdzha rivers, the largest water streams of the Amur River basin. It was established that the bottom sediments are depleted in practically all analyzed major and trace elements as compared to the upper continental crust (UCC) and Post-Archean Australian Shale (PAAS). It is shown that the bottom sediments of the studied rivers are chemically close to those of the Northeastern China rivers, which is related to the similar geographical and climatic environments. Examination of major-component proportions and trace-element variations suggests that the bottom sediments of the middle reaches of the Zeya River were formed from chemically reworked sources. In contrast, the bottom sediments of the lower reaches of the Zeya and Selemdzha rivers are dominated by physically reworked rather than chemically reworked materials. It is suggested that the bottom sediments of the Zeya River downstream the mouth of the Selemdzha River were formed from material, which was supplied by the Selemdzha River and determined the main geochemical characteristics of the bottom sediments of the lower reaches of the Zeya River. This is presumably related to the fact that the upper reaches of the Selemdzha River is located mainly within the Mongol–Okhotsk fold belt, the complexes of which experienced intense tectonic shearing and brecciation. For this reason, the bottom sediments of the Selemdzha River are mainly dominated by physically reworked rather than by chemically reworked material.  相似文献   

The Nature of the “Voice of the Sea”     

G. I. Dolgikh  E. S. Gusev  V. A. Chupin 《Doklady Earth Sciences》2018,481(1):912-915

Strong vibrations of the Earth’s crust in the frequency range of 7–9 Hz, referred to as the “voice of the sea,” have been recorded in the course of processing synchronous experimental data obtained during recording of variations in the deformation of the Earth’s crust using a shore laser strainmeter, atmosphere pressure variations using a laser nanobarograph, and hydrosphere pressure variations using a laser meter for hydrospheric pressure and wind velocity variations. The nature of these vibrations and their transformation to adjacent geospheres have been discussed.  相似文献   

High-Frequency Radiation from an Earthquake Fault: A Review and a Hypothesis of Fractal Rupture Front Geometry     

A. A. Gusev 《Pure and Applied Geophysics》2013,170(1-2):65-93

Observed high-frequency (HF) radiation from earthquake faults exhibits specific properties that cannot be deduced or extrapolated from low-frequency fault behavior. In particular: (1) HF time functions look like random signals, with smooth mean spectrum and moderately heavy-tailed probability distribution function for amplitudes; (2) well-known directivity of low-frequency radiation related to rupture propagation is strongly reduced at HF, suggesting incoherent (delta-correlated) behavior of the HF radiator, and contradicting the usual picture of a rupture front as a regular, non-fractal moving line; (3) in the spectral domain, HF radiation occupies a certain specific band seen as a plateau on acceleration source spectra $ K(f) = f^{2} \dot{M}_{0} (f) $ . The lower cutoff frequency f _b of K(f) spectra is often located significantly higher than the common spectral corner frequency f _c, or f _a. In many cases, empirical f _b(M ₀) trends are significantly slower as compared to the simple f _b ∝ M ₀ ^?1/3 , testifying the lack of similarity in spectral shapes; (4) evidence is accumulating in support of the reality of the upper cutoff frequency of K(f): fault-controlled f _max, or f _uf. However, its identification is often hampered by such problems as: (a) strong interference between f _uf and site-controlled f _max; (b) possible location of f _uf above the observable spectral range; and (c) substantial deviations of individual source spectra from the ideal spectral shape; (5) intrinsic structure of random-like HF radiation has been shown to bear significant self-similar (fractal) features. A HF signal can be represented as a product of a random HF “carrier signal” with constant mean square amplitude, and a positive modulation function, again random, that represents a signal envelope. It is this modulation function that shows approximately fractal behavior. This kind of behavior was revealed over a broad range of time scales, from 1 to 300 s from teleseismic data and from 0.04 to 30 s from near-fault accelerogram data. To explain in a qualitative way many of these features, it is proposed that rupture propagation can be visualized as occurring, simultaneously, at two different space–time scales. At a macro-scale (i.e. at a low resolution view), one can safely believe in the reality of a singly connected rupture with a front as a smooth line, like a crack tip, that propagates in a locally unilateral way. At a micro-scale, the rupture front is tortuous and disjoint, and can be visualized as a multiply connected fractal “line” or polyline. It propagates, locally, in random directions, and is governed by stochastic regularities, including fractal time structure. The two scales and styles are separated by a certain characteristic time, of the order of (0.07–0.15) × rupture duration. The domain of fractal behavior spans a certain HF frequency range; its boundaries, related to the lower and upper fractal limits, are believed to be manifested as f _b and f _uf.  相似文献   

Modeling streamflow of the Olenek and Indigirka rivers using land surface model SWAP   总被引：1，自引：0，他引：1  

E. M. Gusev  O. N. Nasonova  L. Ya. Dzhogan  G. V. Aizel’ 《Water Resources》2013,40(5):535-543

The potentialities of a technique for simulating the runoff from the Olenek and Indigirka river basins located in the Republic of Sakha (Yakutia) under the most severe climate conditions are investigated. The technique is based on a land surface model SWAP in combination with input data based on global data sets on land surface parameters and meteorological forcing data derived from observations from meteorological stations situated within or near the river basins. To improve the calculation quality, an optimization procedure was applied to the key model parameters, including both land surface characteristics and (for the Olenek R.) the correction factors for precipitation and incoming radiation.  相似文献   

Seismic geologic structure model for the sedimentary cover of the Laptev Sea part of the Lomonosov Ridge and adjacent parts of the Amundsen Plain and Podvodnikov Basin     

P.V. Rekant  E.A. Gusev 《Russian Geology and Geophysics》2012,53(11):1150-1162

Seismic data on the southern (Laptev Sea) extremity of the Lomonosov Ridge were used to develop a new structural model for the sedimentary cover. It permitted a correlation between the seismic cross-sections of the ridge crest and two deep-sea basins: the Podvodnikov Basin and the Amundsen Plain. It is the first time that a seismic model has taken into account both regional seismic-reflection profiles obtained from NP drifting ice stations and recent high-resolution CDP data. Our seismic model agrees both with geological data on the Laptev Sea continental margin and the data obtained from deep-sea drilling into the Lomonosov Ridge under the IODP-302 project. The sedimentary cover of the southern Lomonosov Ridge and adjacent parts of the Amundsen Plain and Podvodnikov Basin was dated at the Aptian–Cenozoic. The sedimentary section is divided by two main unconformities, of Campanian–Paleocene and Oligocene–Early Miocene ages. The cover contains a structurally complicated graben system, which is an extension of the New Siberian system of horsts and grabens, recognized in the shelf. Sedimentation began in the grabens in the Aptian–Albian and ended with their complete compensation in the Paleocene.  相似文献   

Shell form,growth, and production of Astarte borealis (Schumacher, 1817) (Astartidae,Bivalvia) in the southeastern Baltic Sea     

A. A. Gusev  L. V. Rudinskaya 《Oceanology》2014,54(4):458-464

The relationships between the linear dimensions and body weight and the ratio between the masses, growth, and production were studied for the bivalve Astarte borealis inhabiting the southeastern Baltic Sea. The maximal shell length was 21.09 mm, while the maximum age was 8+. The linear growth was described by the Bertalanffy equation L _τ = (1 - e ^{-0.0894(τ-(-0.7354))}). The annual production was 7.60 kJ/m² at a P _s/B coefficient of 0.41. It was found that the A. borealis inhabiting the southeastern Baltic Sea was characterized by a lower linear growth rate compared to the mollusks of other parts of the geographical range due to the low salinity of the Baltic Sea.  相似文献   

Numerical simulation of the world ocean circulation and its climatic variability for 1948–2007 using the INMOM     

A. V. Gusev  N. A. Diansky 《Izvestiya Atmospheric and Oceanic Physics》2014,50(1):1-12

The results of simulating global ocean circulation and its interannual variability in 1948–2007 using INM RAS ocean general circulation model INMOM (Institute of Numerical Mathematics Ocean Model) are presented. One of the INMOM versions is also used for the Black Sea dynamics simulation. The CORE datasets were used to set realistic atmospheric forcing. Sea ice area decrease by 2007 was reproduced in the Arctic Ocean that is in good agreement with observations. The interdecadal climatic variability was revealed with significant decrease of Atlantic thermohaline circulation (ATHC) and meridional heat transport (MHT) in North Atlantic (NA) since the late 1990’s. MHT presents decrease of heat transport from NA to the atmosphere since the mid-1990’s. Therefore the negative feedback is revealed in the Earth climate system that leads to reducing of climate warming caused primarily by anthropogenic factor for the last decades. Long-term variability (60 years) of ATHC is revealed as well which influences NA thermal state with 10 year delay. The assumption is argued that this mechanism can make a contribution in the ATHC own long-term variability.  相似文献   

Scenario Projections of Changes in Snow Water Equivalent Due to Possible Climate Changes in Different Regions of the Earth     

Gusev  E. M.  Nasonova  O. N.  Kovalev  E. E.  Shurkhno  E. A. 《Water Resources》2021,48(1):133-145

Water Resources - The study was carried out under the international Earth System Model–Snow Model Intercomparison Project on ten experimental well-instrumented snow sites in different parts...  相似文献   

New Trends in the Development of the Lunar Physical Libration Theory   总被引：4，自引：0，他引：4  

Natalya Petrova  Alexand er Gusev 《Celestial Mechanics and Dynamical Astronomy》2001,80(3-4):215-225

A review of the modern state of the lunar libration theory is presented. A significant progress in the lunar investigation is achieved due to the simultaneous processing of results of the satellite Doppler tracing and of the lunar laser ranging. The data evidencing existence of a small iron core in the Moon are discussed. In this connection, the further development of the theory of rotation of the Moon presents the study of internal structure and dynamics of a lunar body. A model of a two-layer Moon can have a very advanced application to explain some observed phenomena and to be as a first approach in the modelling of internal processes determining the lunar rotation.  相似文献   

Multicolor CCD photometry of the dusty,giant, late-type spiral galaxy NGC 5351     

A. S. Gusev  S. S. Kaisin 《Astronomy Reports》2004,48(8):611-621

The paper reports the results of BV RI surface photometry of the giant galaxy NGC 5351 based on CCD observations obtained on the 1-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. Analysis of the structure and radial brightness distribution in the galaxy shows that NGC 5351 has a complex and, in some places, asymmetric structure. The galaxy possesses a large quantity of dust. The average internal extinction due to dust is A_V=1.2^m±0.4^m. After correcting for the effect of this dust, the parameters of the galaxy are typical of late-type spirals. The compositions of the stellar population in various parts of the galaxy are estimated using two-color diagrams. Star-forming regions in NGC 5351 are identified and studied. Most of the star-forming regions are located in the ring of the galaxy. Evolutionary modeling is used to estimate the ages of regions of violent star formation. An elliptical companion galaxy to NGC 5351 was found. The rotation curve of the galaxy is modeled and its mass estimated. The disk of NGC 5351 is self-gravitating within its optical radius.  相似文献