排序方式： 共有12条查询结果，搜索用时 15 毫秒
1.
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
2.
A. A. Klyuvitkin A. G. Ostrovskii A. N. Novigatskii A. P. Lisitzin 《Doklady Earth Sciences》2016,469(1):771-775
The principal aim of this work is to reveal the regularities of short-period synoptic variability of vertical flows and the composition of settling sedimentary material, to obtain information on the quantitative characteristics of the processes that influence sound-scattering layers in the water layer above the continental slope behind the shelf edge in the northeastern part of the Black Sea. The results were obtained due to improvement of the equipment and the procedures for performing sea experiments on studying physicogeological, biological, and hydrophysical processes in the upper illuminated layer of phytoplankton development. 相似文献
3.
N. V. Politova A. A. Klyuvitkin A. N. Novigatskii N. V. Ul’yanova A. L. Chul’tsova M. D. Kravchishina G. A. Pavlova A. Yu. Lein 《Oceanology》2016,56(5):702-713
Investigations in the water column and bottom sediments including entrapped water were carried out on expeditions of the P.P. Shirshov Institute of Oceanology in the Dvina Bay, the White Sea. We studied the transformation of particulate organic matter at the biogeochemical barrier between the water and bottom and in the underlying Holocene sediments. Low rates of the early diagenesis of sediments caused by low values of primary production in the conditions of high fluxes of terrigenous organic matter were established. The low temperatures of microorganisms habitat play the secondary role. 相似文献
4.
M. D. Kravchishina A. N. Novigatskii N. V. Politova V. V. Zernova S. A. Mosharov O. M. Dara A. A. Klyuvitkin 《Water Resources》2013,40(2):143-156
Multidisciplinary studies of the dispersed sedimentary matter (suspended particulate matter) were carried out in the Volga delta during spring flood in two areas of the Astrakhan State Biosphere Reserve (Obzhorovskii and Damchikskii), allowing the authors to reveal some regularities in sedimentation conditions. Considerable differences were found to exist in the supply of sedimentary material into the sea through the branches and arms of the eastern and western parts of the river delta. Typical of the eastern part are appreciably higher concentrations of suspended particulate matter, biogenic components, and phytopigments, as well as greater phytoplankton abundance and biomass, and sedimentary material fluxes. A relationship was found to exist between the concentration of suspended particulate matter and the phytopigments under consideration. In May, almost entire chlorophyll “a” in suspended particulate matter was concentrated in the cells of small diatom algae, where it was distributed in proportion to diatom biomass. Overall, the suspended matter of the delta is mostly represented by mineral detrital particles (quartz and carbonates) with a relatively small share of clay materials against the background of a huge amount of diatom cells and biogenic detritus. 相似文献
5.
Yu. S. Dolotov N. N. Filatov V. P. Shevchenko N. N. Nemova N. A. Rimskii-Korsakov N. V. Denisenko I. P. Kutcheva P. M. Boyarinov M. P. Petrov V. Kh. Lifshitz A. V. Platonov L. L. Demina V. I. Kukharev V. N. Kovalenko R. E. Zdorovennov T. N. Rat'kova O. M. Sergeeva A. N. Novigatskii L. A. Pautova K. V. Filipieva E.-M. Nothig C. Loronzen 《Water Resources》2005,32(6):611-628
In September 2000, July 2001, and August 2002, three marine expeditions onboard the R/V Ekolog were carried out to study physical, chemical, geological, and biological processes in two estuaries of Karelian coast of the White Sea. A wide complex of modern methods of marine field work was used. The most recent biochemical studies on the estimation of mechanisms of adaptive reactions of hydrobionts to environmental factors (including anthropogenic) were used. 相似文献
6.
7.
8.
9.
10.
Yu. A. Fedorov A. E. Ovsepyan A. P. Lisitzin I. V. Dotsenko A. N. Novigatskii V. P. Shevchenko 《Doklady Earth Sciences》2011,436(1):51-54
This paper analyses the data on the distribution of mercury in the surface layer of bottom sediments (0–5 cm) obtained in
course of sampling trips within the mouth region of the Severnaya Dvina River and the White Sea area. A total of 170 analyses
for mercury were performed. Such wide-scale determination of the mercury content in the bottom sediments was carried out for
the first time in the study region. The patterns of mercury distribution in the Severnaya Dvina River-White Sea transect are
revealed and described. It is shown that the marginal filter of the Severnaya Dvina River facilitates cosedimentation of the
main portion of anthropogenic mercury with suspended matter. This drastically decreases the risk of penetration of mercury
to the White Sea waters and partially (with the gravity current) to the Barents Sea waters. In general, the Severnaya Dvina
River is characterized by mercury pollution of a local scale within the urban territories. No regional pollution of the White
Sea off the marginal filter was revealed. 相似文献