排序方式: 共有14条查询结果,搜索用时 15 毫秒
1.
Spatial variations in the distribution and fluxes of dissolved oxygen and sulfide in bottom sediments of Omega and Sevastopol bays have been studied. The results of analysis reveal that the distribution of dissolved oxygen and sulfide in pore water depends mostly on seasonal variations in the oxygen concentration in bottom water, grain size, the organic carbon content in bottom sediments, and, additionally for Sevastopol Bay, the iron content. The oxygen flux at the bottom of Sevastopol Bay is 20 times larger in winter–spring compared to that of Omega Bay. Anaerobic conditions in Sevastopol Bay sediments are observed much closer to the surface, with their subsequent development in bottom water. 相似文献
2.
O. G. Ignat’eva E. I. Ovsyanyi A. S. Romanov S. K. Konovalov N. A. Orekhova 《Physical Oceanography》2008,18(2):96-105
On the basis of the experimental data accumulated in 1998–2005, we analyzed the space and time variations of the carbonate
system of waters and the content of organic carbon in bottom sediments of the Sevastopol Bay. The intensity of gas exchange
through the water-atmosphere interface was quantitatively estimated. It was shown that the partial pressure of carbon dioxide
pCO2 in waters of the bay became much higher for the period of observations. The maximum changes were observed in summer. They
were especially pronounced for the bottom layer of waters. For the entire period of observations, the invasion of carbon dioxide
CO2 was predominant in the major part of the bay, and the content of organic carbon in the bottom sediments increased. The ability
of waters in the bay to absorb CO2 is explained by the synthesis of organic substances, which becomes possible due to the presence of the equivalent load of
nutrients.
__________
Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 57–67, March–April, 2008. 相似文献
3.
G. M. Beskin S. V. Karpov A. V. Biryukov S. F. Bondar E. A. Ivanov E. V. Katkova N. V. Orekhova A. V. Perkov V. V. Sasyuk 《Astrophysical Bulletin》2017,72(1):81-92
We describe the properties of Mini-MegaTORTORA (MMT-9) nine-channel wide-field optical sky monitoring system with subsecond temporal resolution. This instrument can observe sky areas as large as 900 deg2, perform photometry in three filters close to Johnson BV R system and polarimetry of selected objects or areas with 100–300 deg2 sizes. The limiting magnitude of the system is up to V = 11m for 0.1 s temporal resolution, and reaches V = 15m in minute-long exposures. The system is equipped with a powerful computing facility and dedicated software pipeline allowing it to perform automatic detection, real-time classification, and investigation of transient events of different nature located both in the near- Earth space and at extragalactic distances. The objects routinely detected by MMT-9 include faint meteors and artificial Earth satellites.We discuss astronomical tasks that can be solved using MMT-9, and present the results of the first two years of its operation. In particular, we report the parameters of the optical flare detected on June 25, 2016, which accompanied the gamma-ray burst GRB160625B. 相似文献
4.
Korotaev S. M. Budnev N. M. Serdyuk V. O. Orekhova D. A. Kruglyakov M. S. Kiktenko E. O. Mirgazov R. R. Zurbanov V. L. Gorokhov Ju. V. Ryabov E. V. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(11):1569-1594
Izvestiya, Atmospheric and Oceanic Physics - The vertical component of the electric field Ez in the hydrosphere is not contaminated by the telluric component and therefore can effectively be used... 相似文献
5.
We analyze the components of the carbon system of the Sevastopol bay waters and the balance of main sediment-forming substances
using the data of field investigations in 1998–2008. The interannual variations of total inorganic carbon and the equilibrium
partial pressure of carbon dioxide in the bay water are noted. An increase in the flux of carbon dioxide into the bay and
in the content of organic carbon in bottom sediments is revealed, and an explanation of this phenomenon is given. The priority
accumulation of organic carbon in the sediments of the bay is established. We assess the interannual variation in the relative
abundances of organic and inorganic carbon as an index of the carbon cycle stability. 相似文献
6.
We present the results of investigation of the contents of metals (As, Cr, Co, Cu, Ni, Pb, Zn, V, Sr, Mn, Ti, and Fe) in the
bottom sediments of the Balaklava Bay (Black Sea) carried out in July 2005. It is shown that the pollution of the bottom sediments
with metals has a polyelemental character. We establish the specific features of changes in the contents of the analyzed elements
and localize the sources of their appearance in the ecosystem. On the basis of the results of evaluation of the intensity
of technogenic action upon the marine medium, we determine a group of toxic elements (As, Cr, Cu, Pb, and Zn) accumulated
in the bottom sediments of the bay in amounts significantly exceeding the background values typical of sediments of the Black
Sea shelf. The comparative analysis of the degrees of pollution of the bay and some other coastal water areas with metals
is performed. 相似文献
7.
Korotaev S. M. Budnev N. M. Serdyuk V. O. Kiktenko E. O. Orekhova D. A. 《Izvestiya Physics of the Solid Earth》2022,58(5):706-716
Izvestiya, Physics of the Solid Earth - Abstract—The vertical component of the electric field Ez in the water column can have an almost zero telluric component, which allows effective... 相似文献
8.
S. M. Korotaev M. S. Zhdanov D. A. Orekhova M. S. Kruglyakov I. L. Trofimov Yu. G. Schors V. S. Shneyer 《Izvestiya Physics of the Solid Earth》2010,46(9):759-771
The task of the magnetotelluric (MT) sounding of the heterogeneous deep section of the Arctic ocean floor on the idealized
model of gorst and graben lying on the typical oceanic, or continental Earth’s, crust is solved with the use of 3D quantitative
modeling. In both cases, the sequence is covered by a layer of seawater with a thickness of 4 km. In this work, the difference
in the MT sounding with the use of ocean-floor and surface equipment is considered. As a result, the conclusion was made that
the floor equipment has a higher resolution than the surface equipment, in spite of the fact that the observations from the
ice cover’s surface can be done more easily. 相似文献
9.
By the method of polarographic profiling performed with the help of an Au-Hg glass microelectrode, we obtained the first high-resolution
vertical profiles of the distributions of oxygen, sulfides, oxidized and reduced forms of iron, reduced manganese, and iron
monosulfide in pore waters of the bottom sediments in the Sevastopol Bay. It is shown that the regional features of the vertical
distributions of the main polarographically active compounds are determined by the combination of several factors: the contents
of organic carbon and iron and the sizes of particles of the sediments. 相似文献
10.
Electromagnetic sounding of the Kola Peninsula with a powerful extremely low frequency source 总被引:1,自引:0,他引:1
Velikhov E. P. Grigoriev V. F. Zhdanov M. S. Korotayev S. M. Kruglyakov M. S. Orekhova D. A. Popova I. V. Tereschenko E. D. Schors Y. G. 《Doklady Earth Sciences》2011,438(1):711-716
Experiment on electromagnetic sounding of the Kola Peninsula using unique mobile measuring complex of the low-frequency sounding
was conducted, allowing to investigate a geoelectric section with a depth of several kilometers on distances up to 100 km
from the stationary transmitting aerial. Excess on the order of amplitudes of the vertical component above the horizontal
at all frequencies of sounding was registered in a number of points of measurements. This feature managed to be explained
quantitatively by circulation of current on regional faults with the closure of current through the sea—before unknown galvanic
coastal effect. Interpretation of the results of modeling and neural network solving of inverse problem essentially specifies
the fault tectonics of the central part of the Kola Peninsula. Anomaly remote from the observation profile was found out—local
pinch of a crustal conductive layer consisting of graphitized rocks and associated with the zone of overthrust. 相似文献