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The first results of detailed studies on algae in surface sediments of bays of the White Sea are presented. Both the general patterns of associations of water palynomorphs and diatoms and some regional peculiarities of their formation at different stages of the marginal filter have been discovered. 相似文献
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Novichkova Ye. A. Reikhard L. Ye. Lisitzin A. P. Rybalko A. Ye. de Vernal A. 《Doklady Earth Sciences》2017,474(1):607-611
Doklady Earth Sciences - The Holocene sediments from the inner part of the Dvina Bay of the White Sea (core no. 6042) were analyzed with multidisciplinary methods for the first time. The age of the... 相似文献
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Oceanology - Aquatic palynomorph analysis is widely used for paleooceanological reconstructions. The preparation method used for extraction of aquatic palynomorphs from the sediment includes the... 相似文献
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Yu. S. Dolotov N. N. Filatov N. A. Rimsky-Korsakov R. E. Zdorovennov A. A. Pronin A. V. Tolstikov A. S. Filippov E. A. Novichkova I. P. Kutcheva V. P. Shevchenko 《Oceanology》2011,51(1):105-117
The peculiarities of the distributional patterns of the water temperature, salinity, current velocities, particulate matter
concentration, bottom contour, and zooplankton abundance were studied in relation to the marine-riverine interactions and
tide/ebb phases for coast lines of different configurations in the White Sea during the cruises of the R/V Ekolog (August of 2006 and 2007). A significant difference in the manifestation of the combined effect of the marine and riverine
impacts (the estuarine concave relief) and only the marine impact (the open-sea straight-line portion) was observed, which
results in both variations in the sea water level and the distributional patterns of the suspended matter and the zooplankton. 相似文献
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Dinoflagellate cysts were studied in 42 samples from the surface sediments of the White Sea. The total concentration of dinocysts varies from single cysts to 25 000 cyst/g of dry sediments, which reflects the biological productivity in the White Sea waters and the regional particular features of the sedimentation processes. The highest concentrations are observed in silts; they are related to the regions of propagation of the highly productive Barents Sea waters in the White Sea. Generally, the spatial distribution of dinocysts species in the surface sediments corresponds to the distribution of the major types of water masses in the White Sea. The cysts of the relatively warm-water species (Operculodinium centrocarpum, Spiniferites sp.) of North Atlantic origin that dominate in the sediments indicate an intensive intrusion of the Barents Sea water masses to the White Sea along with hydrological dwelling conditions in the White Sea favorable for the development of these species during their vegetation period. The cold-water dinocyst assemblage (Islandinium minutum, Polykrikos sp.) is rather strictly confined to the inner parts of shallow-water bays, firstly, those adjacent to the Onega and Severnaya Dvina river mouths. 相似文献
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Novichkova E. A. Savvichev A. S. Bashirova L. D. Kozina N. V. Klyuvitkin A. A. Politova N. V. Novigatsky A. N. Lein A. Yu. 《Oceanology》2019,59(4):577-590
Oceanology - Marine sediments and samples of suspended particulate matter from the North Atlantic were studied. It is shown that modern sedimentation in this area is controlled mainly by the... 相似文献
17.
Ye. I. Polyakova T. S. Klyuvitkina E. A. Novichkova H. A. Bauch H. Kassens 《Water Resources》2009,36(3):273-283
The spatial and temporal changes in the Lena River runoff over the last 9 thousand years are reconstructed through studying the freshwater microfossils in sediment cores obtained from the Laptev Sea inner shelf immediately adjacent to the Lena delta and subject to the freshening effect of river water inflowing the sea through the main arms of the delta (the Trofimovskaya, Bykovskaya, and Tumatskaya arms), the sediments having been thoroughly AMS 14C dated. The freshwater species of diatoms (predominantly the river ones) and green algae that enter the shelf with river water served as indicators of river runoff. The reconstruction of paleosalinity of the sea surface water in the regions under study is based on the relationships (established earlier) between the distribution of freshwater diatoms in the surface layers of sediments in the Arctic seas and the gradients of water salinity in summer. Data on variations in the composition of aquatic microfossil associations in sediments and the reconstructed paleosalinity in the regions of the eastern and western paleovalleys of the Lena River are used to determine the main paleohydrologic events that controlled the variations in the Lena runoff into the shelf zone of the Laptev Sea during the Holocene. 相似文献
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V. P. Shevchenko V. B. Korobov A. P. Lisitzin A. S. Aleshinskaya O. Yu. Bogdanova N. V. Goryunova I. V. Grishchenko O. M. Dara N. N. Zavernina E. I. Kurteeva E. A. Novichkova O. S. Pokrovsky F. V. Sapozhnikov 《Doklady Earth Sciences》2010,431(2):497-501
The descent of a large quantity of dust responsible for bright colors of atmospheric precipitation in the temperate, subpolar, and polar zones of the northern hemisphere is rarely observed [1–5]. In the twentieth century and in the beginning of the twenty-first century in the northern part of European Russia, such events had not been registered right up to March 25–26, 2008. At that time in some parts of the Arkhangelsk region, Komi Republic, and Nenets Autonomous Area, atmospheric precipitation as moist snow and rain responsible for sand and saffron colors of ice crust formation on the snow surface was observed. Thus, due to detailed mineralogical, geochemical, pollen, diatom, and meteorological investigations, it was established that the main source of the yellow dust is the semidesert and steppe regions of the Northwest Kazakhstan, and the Volgograd and Astrakhan regions, Kalmykia. 相似文献