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排序方式: 共有76条查询结果,搜索用时 46 毫秒
1.
A. I. Kopylov A. F. Sazhin E. A. Zabotkina A. V. Romanenko N. D. Romanova P. R. Makarevich M. P. Wenger 《Oceanology》2016,56(6):789-798
The paper considers the concentrations and functional characteristics of viruses, bacteria, and heterotrophic nanoflagellates determined for the first time in the Laptev Sea in August-September, 2014. The abundance of bacteria, viruses, and heterotrophic nanoflagellates varied from 110.1 × 103 to 828.4 × 103 cells/mL, from 384.2 × 103 to 2932.8 × 103 particles/mL, and from 108 to 651 cells/mL, respectively. The daily bacterioplankton production varied from 4.2 × 103 to 381.7 × 103 cells/mL, with an average of 117.6 × 103 cells/mL. Electron transmission microscopy has for the first time shown that the frequency of visibly infected bacterial cells varied from 0.2 to 2.0% (0.8% on average) of NB. The average virus-induced mortality of bacteria was 6.3% of bacterioplankton production, with variations ranging from 1.4 to 16.9%. Grazing on bacteria by heterotrophic nanoflagellates contributed more to bacteria mortality than virus-induced bacterial lysis. By grazing on bacteria, heterotrophic nanoflagellates consumed large quantities of viruses located on the surface and inside bacterial cells. 相似文献
2.
The equations of dynamics of eddy—wave disturbances of two-dimensional stratified flows in an ideal incompressible fluid that are written in a Hamiltonian form are used to study the resonant interaction of waves of discrete and continuous spectra. A gravity—shear wave generated at a jump of the density and vorticity of the undisturbed flow and a wave generated at a weak vorticity jump, which is similar to a wave of a continuous spectrum, participate in the interaction. The equations are written in terms of normal variables to obtain the system of evolution equations for the amplitudes of the interacting waves. The stability condition for eddy—wave disturbances is derived within the framework of the linear theory. It is shown that a cubic nonlinearity may lead to the stabilization of unstable disturbances if the coefficient of the nonlinear term is positive. 相似文献
3.
4.
Oceanology - The variability of sea ice in the Weddell Sea, along with melting of glaciers of the Antarctic Peninsula and ice shelves, determines the volumes of melt water entering the water area,... 相似文献
5.
Vernikovskaya A. E. Vernikovsky V. A. Matushkin N. Yu. Kadilnikov P. I. Metelkin D. V. Li Z.-X. Wilde S. A. Romanova I. V. Bogdanov E. A. 《Doklady Earth Sciences》2019,489(1):1285-1288
Doklady Earth Sciences - An Ediacaran complex of dike rocks has been identified for the first time in the Yenisei Ridge orogen. These igneous rocks are represented by basic, intermediate and acidic... 相似文献
6.
Water Resources - The size structure of zooplankton in Kolsay Lakes was characterized with the use of the values of Clarke W-statistic, ?-Shannon–Weaver, and the average individual mass... 相似文献
7.
N. D. Romanova Yu. A. Mazei D. V. Tikhonenkov A. F. Sazhin A. I. Azovsky 《Oceanology》2013,53(3):334-344
The qualitative and quantitative characteristics of the heterotrophic microbial communities (bacteria, flagellates, and ciliates) in the thin water-sediment layer in the Kara Sea are analyzed. The bacterial abundance correlated with the concentration of organic matter, whereas their size depended on the abundance of heterotrophic flagellates. The number of species of heterotrophic flagellates increased with the increase in the bacterial number. A positive relationship between the bacterial abundance and the ration of heterotrophic flagellates was observed at the offshore stations, probably due to the grazing pressure. The density of the ciliates on the soft silty and sandy-silty sediments was extremely low. The share of upstream filter feeding ciliate species increased with the increase in the abundance of the flagellates, probably due to the shift to less selective feeding strategies at higher values of the food concentrations. The classification of the heterotrophic microbial communities in the surface sediment layer has revealed two distinct types of the communities. The river communities are rich in species and are characterized by the high abundance of microorganisms. They are gradually replaced by marine communities at the salinity of 9%. 相似文献
8.
Possibilities of electric field measurements in the audio frequency range using underground (capacitive) electric sensors are considered. Features of parameters of electric sensors and input circuits of the measurement equipment, robust methods, and software tools for processing obtained data are analyzed. Examples of experimental studies by the audiomagnetotelluric sounding (AMTS) method, demonstrating possibilities of implementing ungrounded electric field measurements in a frequency range of 7?C300 Hz, are presented. 相似文献
9.
This paper studies the role of magnetospheric factors, such as convection and energetic electron precipitation during the
formation of positive disturbances in the total electron content under the conditions of the summer evening ionosphere. à
numerical model of the ionosphere and plasmasphere, where time variations in the magnetospheric convection velocity and electron
precipitation parameters correspond to the main phase of a magnetic storm, has been used for this purpose. It has been indicated
that the total electron content sharply increases (the “dusk effect”) in the eastern and western sectors at approximately
the same geomagnetic latitudes corresponding to the subauroral zone provided that a sudden storm commencement is registered
in the morning hours. local time. This peak of the total electron content is formed as a result of joint reconstruction of
the magnetospheric convection pattern and energetic electron precipitation during the main phase of a storm. In this case,
magnetospheric convection plays the main role, raising the F2 layer by 40–80 km into the region with a lower recombination rate. 相似文献
10.
O.M. Pirog N.M. Polekh E.B. Romanova A.V. Tashchilin G.A. Zherebtsov 《Journal of Atmospheric and Solar》2009,71(1):49-60
Research results concerning the main ionospheric trough (MIT) in the afternoon sector are present. Data are used from the meridional chain of stations located in the East Asian region. The analysis of ionospheric storms with different intensities reveals that the depletion in the F2 layer ionization in the afternoon/evening sector can be observed in the subauroral latitudes in the storm recovery phase predominantly during equinoxes and is associated with the formation of the MIT equatorward wall. Model calculations of the evening trough show that its location coincides with the belt of westward drift in the geomagnetic latitudes 55–65° at 13–17 MLT. Hence the simulated results support the assumption that the narrow and deep trough in the afternoon sector is formed by the westward drift with high velocities (~700 m/s). the drift transports the low-density plasma from the night side. The eastward drift with high velocities (~1000–1200 m/s) transports the low-density plasma from the night to morning side forming a trough in the morning sector. 相似文献