Holocene Sedimentation History in the Southern Novaya Zemlya Trench     

M. A. Levitan  N. A. Belyaev  M. V. Burtman  J.-C. Duplessy  T. A. Khusid 《Lithology and Mineral Resources》2003,38(6):564-575

It is shown that sediments accumulated in the Southern Novaya Zemlya Trench at both deglaciation and marine stages. Permanent sea ice sheet existed during the deglaciation, and glacier meltwater was intensely delivered to the bottom layer. Along with the dominant sediment supply from the Southern Island of Novaya Zemlya, southern continental sources also played a noticeable role at that stage. Seasonal sea ice freezing led to the formation of cold brines at the marine stage. Like paleoproductivity, these processes were irregular. Dissolution of calcareous benthic foraminiferal tests considerably intensified after about 7 ka BP owing to a stronger Atlantic water advection into the Western Arctic and consequent increase in paleoproductivity, whereas the relative role of southern sedimentary provenances decreased. Sedimentation rates were constant (45 cm/ka) during the entire marine stage.  相似文献   

The study of the long-term effects of a catastrophic black oil spill in the Kerch Strait     

G. A. Kolyuchkina  V. A. Spiridonov  U. V. Simakova  V. I. Peresypkin  N. A. Belyaev  P. V. Khlebopashev  A. V. Makarov  F. V. Sapozhnikov  V. V. Kozlovskii  E. S. Shapovalova 《Oceanology》2009,49(5):742-744

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Prospects of the apatite-bearing potential of the baltic shield and its slopes     

E. V. Belyaev  V. G. Chaikin 《Doklady Earth Sciences》2011,441(2):1616-1618

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Variability of Sedimentation Processes in Northern Part of East Novaya Zemlya Trough in the Anthropocene     

Novichkova  E. A.  Reykhard  L. E.  Belyaev  N. A.  Aliev  R. A.  Starodymova  D. P.  Kudryavtseva  E. A. 《Oceanology》2020,60(5):664-681

Oceanology - The lithological and mineralogical characteristics of sea surface sediments, composition of microfossils, contribution of organic matter, and element composition have been studied in a...  相似文献   

Determination of the concentration of mineral particles and suspended organic substance based on their spectral absorption     

B. V. Konovalov  M. D. Kravchishina  N. A. Belyaev  A. N. Novigatsky 《Oceanology》2014,54(5):660-667

A method to determine the concentrations of the particulate mineral matter (C _PMM) and the particulate organic matter (C _POM) is suggested. The values of C _PMM and C _POM are calculated from the measurements of the spectral coefficients of the light absorption a _POM(440) and a _PMM(750) using empirical equations. The latter have been obtained by comparing the concentrations of the suspended solids measured by means of the gravimetric method with the spectral values of the optical density of the suspended matter settled on membrane filters. The data used are typical of the coastal waters of inland and marginal seas and the open ocean and cover the range of three and two orders of magnitude for the concentrations of C _PMM and C _POM, respectively.  相似文献   

Vertical profiling of SO2 and SO above Venus’ clouds by SPICAV/SOIR solar occultations     

Denis A. Belyaev  Franck Montmessin  Jean-Loup Bertaux  Arnaud Mahieux  Anna A. Fedorova  Oleg I. Korablev  Emmanuel Marcq  Yuk L. Yung  Xi Zhang 《Icarus》2012,217(2):740-751

New measurements of sulfur dioxide (SO₂) and monoxide (SO) in the atmosphere of Venus by SPICAV/SOIR instrument onboard Venus Express orbiter provide ample statistics to study the behavior of these gases above Venus’ clouds. The instrument (a set of three spectrometers) is capable to sound atmospheric structure above the clouds in several observation modes (nadir, solar and stellar occultations) either in the UV or in the near IR spectral ranges. We present the results from solar occultations in the absorption ranges of SO₂ (190–230 nm, and at 4 μm) and SO (190–230 nm). The dioxide was detected by the SOIR spectrometer at the altitudes of 65–80 km in the IR and by the SPICAV spectrometer at 85–105 km in the UV. The monoxide’s absorption was measured only by SPICAV at 85–105 km. We analyzed 39 sessions of solar occultation, where boresights of both spectrometers are oriented identically, to provide complete vertical profiling of SO₂ of the Venus’ mesosphere (65–105 km). Here we report the first firm detection and measurements of two SO₂ layers. In the lower layer SO₂ mixing ratio is within 0.02–0.5 ppmv. The upper layer, also conceivable from microwave measurements by Sandor et al. (Sandor, B.J., Todd Clancy, R., Moriarty-Schieven, G., Mills, F.P. [2010]. Icarus 208, 49–60) is characterized by SO₂ increasing with the altitude from 0.05 to 2 ppmv, and the [SO₂]/[SO] ratio varying from 1 to 5. The presence of the high-altitude SO_x species could be explained by H₂SO₄ photodissociation under somewhat warmer temperature conditions in Venus mesosphere. At 90–100 km the content of the sulfur dioxide correlates with temperature increasing from 0.1 ppmv at 165–170 K to 0.5–1 ppmv at 190–192 K. It supports the hypothesis of SO₂ production by the evaporation of H₂SO₄ from droplets and its subsequent photolysis at around 100 km.  相似文献   

Sulfur chemistry in the middle atmosphere of Venus     

Xi Zhang  Mao Chang Liang  Franklin P. Mills  Denis A. Belyaev  Yuk L. Yung 《Icarus》2012,217(2):714-739

Venus Express measurements of the vertical profiles of SO and SO₂ in the middle atmosphere of Venus provide an opportunity to revisit the sulfur chemistry above the middle cloud tops (～58 km). A one dimensional photochemistry-diffusion model is used to simulate the behavior of the whole chemical system including oxygen-, hydrogen-, chlorine-, sulfur-, and nitrogen-bearing species. A sulfur source is required to explain the SO₂ inversion layer above 80 km. The evaporation of the aerosols composed of sulfuric acid (model A) or polysulfur (model B) above 90 km could provide the sulfur source. Measurements of SO₃ and SO (a¹Δ → X³Σ^-) emission at 1.7 μm may be the key to distinguish between the two models.  相似文献   

Some Features of the Intra-Annual Variability of Heat Fluxes in the North Atlantic     

Belyaev  K. P.  Korolev  V. Yu.  Gorshenin  A. K.  Antipov  A. I.  Imeev  M. A.  Kirushkin  N. I.  Lobovskii  M. A. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(6):619-631

Izvestiya, Atmospheric and Oceanic Physics - In this paper, statistical regularities of the intra-annual variability of heat fluxes in the North Atlantic during the ocean–atmosphere...  相似文献   

Seasonal Variability in the Sedimentary Matter Flux on the Shelf of the Northern Kara Sea     

Drits  A. V.  Kravchishina  M. D.  Sukhanova  I. N.  Belyaev  N. A.  Karmanov  V. A.  Flint  M. V. 《Oceanology》2021,61(6):984-993

Oceanology - Sedimentation rates in the northern Kara Sea between September 2019 and July 2020 were calculated from integrated monthly values for sedimentary matter, organic carbon, nitrogen, total...  相似文献   

An emission layer as a gravity wave detector     

A.N. Belyaev 《Journal of Atmospheric and Solar》2009,71(17-18):1974-1981

A three-dimensional model is used to investigate the relations between parameters of atmospheric gravity waves (GW) and the spatial structure of O₂ atmospheric (0,0) nightglow wave perturbations observed from space. It is shown that observed perturbations may be divided into the linear and nonlinear parts. The linear perturbations appear as wavelet signatures observed at certain viewing directions. The nonlinear part of the perturbations causes an increase in all sky brightness of the O₂ atmospheric (0,0) nightglow. The model shows that at certain viewing directions the cancellation effect for waves passing through the emission layer disappears. The latter gives the opportunity to create the complete set of functions that may be used for the spectral decomposition of observed brightness field. The obtained spectrum may be interpreted in terms of the Fourier coefficients of 3D-decomposition of the temperature fluctuations induced by gravity waves just near the emission layer.  相似文献