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Oceanology - Various aspects of the seasonal and interannual variability of the sea ice cover are estimated based on all available Bering Sea ice data from 1960 to 2017. The possibility of... 相似文献
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G. G. Boeskorov P. R. Nogovitsyn E. N. Mashchenko I. N. Belolyubsky A. D. Stepanov V. V. Plotnikov A. V. Protopopov M. V. Shchelchkova J. van der Plicht N. G. Solomonov 《Doklady Earth Sciences》2016,469(1):647-651
This paper considers the data on new findings of mammoth fauna remains in the Middle Lena basin used to specify the species composition of large Late Neopleistocene mammals represented by eleven species. The obtained range of radiocarbon dates made it possible to state that mass burials of Pleistocene mammal remains were formed in the region during the Karginsk Interstadial (24 000–55 000 years ago). 相似文献
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E. L. Afraimovich E. A. Kosogorov N. P. Perevalova A. V. Plotnikov 《Journal of Atmospheric and Solar》2001,63(18)
This paper is concerned with the parameters of shock-acoustic waves (SAW) generated during rocket launchings. We have developed the interferometric method for determining SAW parameters (including angular characteristics of the wave vector, and the SAW phase velocity, as well as the direction towards the source) using GPS-arrays. Contrary to the conventional radio-probing techniques, the proposed method provides an estimate of SAW parameters without a priori information about the site and time of a rocket launching. The application of the method is illustrated by a case study of ionospheric effects from launchings of rockets PROTON, SOYUZ and SPACE SHUTTLE from Baikonur and Kennedy Space Center cosmodromes in 1998–2000. In spite of a difference of rocket characteristics, the ionospheric response for all launchings had the character of an N-wave corresponding to the form of a shock wave. The SAW period T is 270–360 s, and the amplitude exceeds the standard deviation of total electron content background fluctuations in this range of periods under quiet and moderate geomagnetic conditions by factors of 2–5 as a minimum. The angle of elevation of the SAW wave vector varies from 30° to 60°, and the SAW phase velocity (900–1200 m/s) approaches the sound velocity at heights of the ionospheric F-region maximum. The position of the SAW source, inferred by neglecting refraction corrections, corresponds to the segment of the rockets path at a distance no less than 200–900 km from the launch pad, and to the rocket flying altitude no less than 100 km. Our data are consistent with the existing view that SAW are generated during a nearly horizontal flight of the rocket with its engine in operation in the acceleration segment of the path at 100–130 km altitudes in the lower atmosphere. 相似文献
4.
N. I. Andreev I. S. Plotnikov N. V. Aladin 《International Journal of Salt Lake Research》1992,1(1):111-116
Data are presented on the composition and biomass of the Aral Sea zooplankton in August and October, 1989. As salinity gradually
increased, a decrease in zooplankton species composition occurred at a salinity of 25–30 g L−1. Because the Aral has now divided into two water-bodies, the zooplankton communities in these lakes have begun to conform
with their individual hydrological and biological regimes. 相似文献
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The peculiarities of the generation of infragravity sea waves with the periods from 30 s to 5 minutes are identified by the processing and analysis of experimental data obtained with the laser meter of hydrosphere pressure variations in the Vityaz’ Bay (the Sea of Japan). 相似文献
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G. I. Dolgikh S. S. Budrin S. G. Dolgikh A. A. Plotnikov V. A. Chupin V. A. Shvets S. V. Yakovenko 《Russian Meteorology and Hydrology》2016,41(8):559-563
The results of the experiments on the registration of hydrosphere pressure variations are analyzed. The experiments were conducted in 2011, 2012, and 2014 using the laser meter ofhydrosphere pressure variations and the laser hydrophone in some bays of the Posyet Gulf in the Sea of Japan. Basic attention is given to the wind waves and fundamental modes of free oscillations in the bays. 相似文献
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Yu. N. Goryachkin V. A. Ivanov L. I. Ivanov I. K. Keita V. A. Plotnikov 《Physical Oceanography》1990,1(3):219-224
We have determined the energetic and spatial characteristics of baroclinic and barotropic tidal semi-diurnal fluctuations using the current temperature and velocity data collected by 12 self-contained buoy stations (SCBS) near the shelf of the Republic of Guinea at depths ranging from 50 to 1000 m. Intensive baroclinic motion was observed to prevail near the bottom within the depth range 100–1000 m. The energy of long waves largely propagated from the bottom to the surface, whereas the energy of short waves was transferred in the opposite direction.Translated by V. Puchkin. 相似文献
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A longitudinal magnetic field often suffers the saturation effect in a strong magnetic field region when the measurement is performed at a single-wavelength point and linear calibration is adopted.In this study,we develop a method that can judge the threshold of saturation in Stokes V/I observed by the Solar Magnetic Field Telescope(SMFT)and correct it automatically.The procedure is to first perform the second-order polynomial fit to the Stokes V/I vs.I/Im(Im is the maximum value of Stokes I)curve to estimate the threshold of saturation,then reconstruct Stokes V/I in a strong field region to correct for saturation.The algorithm is demonstrated to be effective by comparing with the magnetograms obtained by the Helioseismic and Magnetic Imager(HMI).The accuracy rate of detection and correction for saturation is~99.4%and~88%respectively among 175 active regions.The advantages and disadvantages of the algorithm are discussed. 相似文献
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Dolgikh G. I. Plotnikov A. A. Dolgikh S. G. Chupin V. A. Yakovenko S. V. 《Doklady Earth Sciences》2010,430(1):104-107
On the basis of experimental data on hydrospheric pressure variations, obtained with the use of a laser hydrophone and laser
gauge of hydrospheric pressure variations, while hydroacoustic radiators were running, generating hydroacoustic waves at frequencies
of about 32, 245, and 421 Hz in water, it was established that there is no modulating action of wind sea waves on the propagating
hydroacoustic signals along the “radiator-receiver” trace, within the limits of experimental error and the processing methods
used. 相似文献