Sedimentogenesis in the White Sea: Vertical Fluxes of Suspended Particulate Matter and Absolute Masses of Bottom Sediments     

Novigatsky  A. N.  Lisitzin  A. P.  Shevchenko  V. P.  Klyuvitkin  A. A.  Kravchishina  M. D.  Politova  N. V. 《Oceanology》2020,60(3):372-383

Oceanology - A new approach has been applied to studying marine sedimentation using dispersed sedimentary material in sediment traps compared to the surface layer of bottom sediments. Based on...  相似文献   

Atmospheric Internal Gravity Waves Caused by Tsunamis over Kuril Islands     

A. V. Skorokhodov  G. V. Shevchenko 《Izvestiya Atmospheric and Oceanic Physics》2018,54(4):364-371

MODIS (Aqua and Terra) space images of the northwest part of the Pacific Ocean at instants of considerable tsunamis in 2009–2011 have been analyzed. Periodic cloud structures typical for internal gravity waves (IGWs) in the atmosphere have been revealed in the region of the Kuril Islands in five cases. It has been shown that the meteorological conditions observed during those events favored the appearance of such phenomena. The continuous oceanic upwelling in the region of the Kuril–Kamchatka Trench is a favorable factor for IGW generation due to the creation of temperature contrasts observed both in warm and cold seasons between the ground layer of the atmosphere and ocean surface. The estimate of the structure of cloud manifestations of atmospheric waves by satellite images testifies also to the influence of the Kuril Ridge orography on their appearance and propagation over the water area under study. The increase in amplitudes and duration of oscillations caused by the tsunami in the shelf zone can be an auxiliary factor for the IGW generation over coastal territories.  相似文献   

Autonomous (Non-Plate-Tectonic) Geodynamics of the Pyrenees     

Shevchenko  V. I.  Guseva  T. V.  Dobrovolsky  I. P.  Krupennikova  I. S.  Lukk  A. A. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(8):826-847

Izvestiya, Atmospheric and Oceanic Physics - The tectonic structure, seismicity, and modern geodynamics of the roughly EW-trending Pyrenees are considered based on the literature data. Geological...  相似文献   

On the Nature of the Impactor That Formed the Shackleton Crater on the Moon     

Svetlana G. Pugacheva  Ekaterina A. Feoktistova  Vladislav V. Shevchenko 《Earth, Moon, and Planets》2016,118(1):27-50

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Concentrations of Chemical Elements in the Water and Suspended Matter of the Northern Dvina River and the Annual Gross Runoff to the White Sea     

Gordeev  V. V.  Shevchenko  V. P.  Korobov  V. B.  Kochenkova  A. I.  Starodymova  D. P.  Belorukov  S. K.  Lokhov  A. S.  Yakovlev  A. E.  Chultsova  A. L.  Zolotykh  E. O.  Lobkovsky  L. I. 《Doklady Earth Sciences》2021,500(1):787-793

Doklady Earth Sciences - The results of four years of continuous investigations (from May 2015 through April 2019) of the elemental composition of the water of the Northern Dvina River are...  相似文献   

Peculiarity of the Relationship between the Seismicity and Tectonic Structure of the Pyrenees     

A. A. Lukk  V. I. Shevchenko 《Izvestiya Physics of the Solid Earth》2018,54(3):415-429

The geotectonic position of the Pyrenees mountain massif in the Alpine–Indonesian mobile belt is considered. The geological data testify to the formation of the structure of the Pyrenees in the setting of a subhorizontal compression perpendicular to the ridge. The commonly accepted interpretation considers this compression in the context of plate tectonic notions related to the collision between the Iberian and Eurasian lithospheric plates resulting from the convergence of the Eurasian and African plates. However, this interpretation is challenged by the the geodetic and seismological measurements. The GPS measurements suggest a certain cross-strike spreading rather than shortening of the Earth’s crust; the focal mechanisms of the earthquakes indicate the predominance of a subhorizontal extension perpendicular to the strike of the Pyrenees mountain range. The processes of the gravitational collapse of the mountain chain during the isostatic upwelling of the orogenic crust are considered as the most probable cause of this spreading by a number of the authors.  相似文献   

Composition of the suspended particulate matter at the Severnaya Dvina River mouth (White Sea) during the spring flood period     

M. D. Kravchishina  V. P. Shevchenko  A. S. Filippov  A. N. Novigatskii  O. M. Dara  T. N. Alekseeva  V. A. Bobrov 《Oceanology》2010,50(3):365-385

The grain-size and mineral composition of the suspended particulate matter (SPM) of the Severnaya Dvina River mouth is studied, as well as the content of several lithogenic elements in the SPM during the spring flood in May 2004. The data published on the composition of the riverine SPM in the White Sea basin are very poor. The spring flood period when more than half of the annual runoff is supplied from the river to the sea in a short time is understood more poorly. The report considers the comparison results for the grain-size compositions of the SPM and the bottom sediments. The data of laser and hydraulic techniques of the grain-size analysis are compared. The short-period variations of the SPM concentration and composition representing two diurnal peaks of the tide level are studied. It is found that the SPM is mainly transferred during the spring flood as mineral aggregates up to 40 μm diameter. The sandysilty fraction of the riverine SPM settles in the delta branches and channels, and the bulk of the fine pelitic matter is supplied to the sea. The mineral and chemical composition of the Severnaya Dvina River SPM is determined by the supply of substances from the drainage basin. This substance is subjected to intense mechanic separation during the transfer to the sea. The key regularities of the formation of the mineral composition of the SPM during the flood time are revealed. The effect of the grain-size composition of the SPM on the distribution of the minerals and elements studied in the dynamic system of the river mouth are characterized.  相似文献   

Nannoplankton of the Atlantic Ocean from sediment trap samples     

O. B. Dmitrenko  V. N. Lukashin  V. P. Shevchenko 《Oceanology》2006,46(1):33-49

Calcareous nannoplankton from sediment trap samples collected at six sites in the Atlantic Ocean from 23° S to 73° N (cruise 20 of R/V Vityaz’ and cruise 33 and 34 of R/V Akademik Mstislav Keldysh). Those samples were studied with a scanning electron microscope. In the coastal and open-sea regions of the North and South Atlantic and in the subarctic region of the Norwegian Sea, the conditions are significantly different. In the shelf area of the Benguela upwelling, 11 species were recognized; some of them were agglutinated by diatoms and tintinnides or covered the surface of pellets. The Broken Spur and TAG pelagic areas of the North Atlantic contained up to 43 coccolith species. They included holococcoliths, large pelagic, and delicate easily soluble species distributed over the entire water column. The presence of coccoliths in the high-latitude area of the Norwegian Sea is related to their supply with the warmer North Atlantic waters. These assemblages are distinguished by a low species diversity and an enhancement of the coccolith solubility with the depth increase.  相似文献   

Streamflow of Russian Rivers under Current and Forecasted Climate Changes: A Review of Publications. 1. Assessment of Changes in the Water Regime of Russian Rivers by Observation Data     

Frolova  N. L.  Magritskii  D. V.  Kireeva  M. B.  Grigor’ev  V. Yu.  Gelfan  A. N.  Sazonov  A. A.  Shevchenko  A. I. 《Water Resources》2022,49(3):333-350

Water Resources - Publications on changes in river water regime in Russia under the conditions of current climate changes are reviewed. Most recent generalizations of such publications are...  相似文献   

Gray Silts of the Volga Reservoir Cascade: Main Features of Geochemistry     

Maslov  A. V.  Nemirovskaya  I. A.  Shevchenko  V. P. 《Lithology and Mineral Resources》2022,57(3):181-198

Lithology and Mineral Resources - The main geochemical characteristics of gray silts of the Volga Reservoir cascade are discussed. Together with sandy varieties, they occupy more than 60% of the...  相似文献