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L. V. Ilyash L. S. Zhitina T. A. Belevich V. P. Shevchenko M. D. Kravchishina A. N. Pantyulin A. V. Tolstikov A. L. Chultsova 《Oceanology》2016,56(3):372-381
The species composition and biomass of phytoplankton, concentrations of chlorophyll a (Chl a) and nutrients, and accompanying hydrophysical conditions have been studied in the White Sea on July 6–11, 2009. The temperature of the surface water layer was lower than the multiyear average in July. Dinoflagellates dominated in the entire studied area; this was not the typical event for July. We suggest that domination of dinoflagellates was caused by low water temperature, when the nutrient regeneration rate was insufficient to support diatom growth. The abundance of microalgae and the structure of the phytoplankton community depended on the water structure. Variations in the phytoplankton community structure were caused not by substitution of specific species but rather by variability of the abundance of a single species, Heterocapsa triquetra. The highest phytoplankton biomass has been recorded in weakly stratified waters, where tidal mixing supplied the income of inorganic nutrients. The income of nutrients to the photic layer was limited in the stratified waters of Dvina Bay during the summer low-water period, so the phytoplankton abundance was low. We suggest that the lens of surface desalinated water presumably originated from the outlet of the Dvina River was registered in the central part of the White Sea. 相似文献
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A. V. Medvedev K. G. Ratovsky M. V. Tolstikov D. S. Kushnarev 《Geomagnetism and Aeronomy》2009,49(6):775-785
The method for studying the spatial-temporal structure and propagation characteristics of traveling ionospheric disturbances,
using the spectral and cross-correlation analysis of electron density disturbances at different altitudes, obtained with the
incoherent scatter radar and vertical sounding ionosonde, is considered. Different algorithms for detecting traveling ionospheric
disturbances and calculating the total vector of the disturbance propagation velocity are presented. The results of the method
application have been considered in detail, using September 11, 2005, as an example. 相似文献
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Oceanology - The abundance, biomass, size structure of small photosynthetic flagellates (SPF; 3–10 µm), chlorophyll a (Chl a), and the contribution of SPF to the total phytoplankton... 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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Climate extremes in South Western Siberia: past and future 总被引：1，自引：1，他引：0
Degefie T. Degefie Elisa Fleischer Otto Klemm Andrey V. Soromotin Olga V. Soromotina Andrey V. Tolstikov Nikolay V. Abramov 《Stochastic Environmental Research and Risk Assessment (SERRA)》2014,28(8):2161-2173
In this study, the temporal and spatial trends of ten climate extreme indices were computed based on observed daily precipitation and on daily maximum and minimum temperatures at 26 weather stations in South Western Siberia during the period 1969–2011 and, based on projected daily maximum and minimum temperatures, during 2021–2050. The Mann–Kendall test was employed to analyze the temporal trend and a combination of multiple linear regressions and semivariogram functions were used to evaluate the regional spatial trends and the local spatial variability of climate extremes, respectively. The results show that the temperature-based climate extremes increase at a 0.05 significance level while none of the precipitation-based climate extremes did. Spatially, dominant gradients are observed along latitude: The northern taiga vegetation zone experiences a colder and wetter climate while the southern forest steppe zone is drier and hotter. Over time, a tendency towards homogenization of the regional climate is observed through a decrease of the spatial variability for most climate extreme indices. In the future, the most intense changes are anticipated for the bio-climate indicators “growing season length” and “growing degree days” in the north, while the warming indicators, “warm day” and “warm night” are expected to be high to the south. 相似文献
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Yu. S. Dolotov N. N. Filatov V. P. Shevchenko M. P. Petrov A. V. Tolstikov R. E. Zdorovennov A. V. Platonov A. S. Filippov K. L. Bushuev I. P. Kutcheva N. V. Denisenko R. Stein C. Saukel 《Oceanology》2008,48(2):255-267
The distribution of the temperature and salinity, current velocities, suspended particulate matter, bottom sediments, bottom morphology, and planktonic and benthic organisms during the summer period are studied in the estuary of the large Onega River and the coastal areas of Onega Bay (White Sea) influenced by interacting marine and riverine factors. 相似文献
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The mean multiannual temperature regime of the surface water layer in the near-shore regions of the White Sea is analyzed from the data obtained at the VNIIGMI-MTsD (Obninsk). A function describing the seasonal temperature trend in the surface layer was found by the method previously used for an analysis of the Onega and Ladoga lakes. The method is based on the nonlinear approximation of the field observations by a function composed of a combination of exponents with coefficients to be calculated. Explicit seasonal dependences of the mean temperature of the surface water layer in the White Sea were obtained for nine near-shore stations. The root-mean-square deviations of the measured values of the water temperature were estimated. 相似文献