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51.
Andreev Andrey G. Budyansky Maxim V. Khen Gennady V. Uleysky Michael Yu. 《Ocean Dynamics》2020,70(5):593-602
Ocean Dynamics - To study the water dynamics in the western Bering Sea, the time series of geostrophic velocities derived from satellite altimetry, Global total current (Copernicus Globcurrent)... 相似文献
52.
Mesoscale circulation along the Sakhalin Island eastern coast 总被引:1,自引:1,他引:0
Sergey V. Prants Andrey G. Andreev Michael Yu. Uleysky Maxim V. Budyansky 《Ocean Dynamics》2017,67(3-4):345-356
The seasonal and interannual variability of mesoscale circulation along the eastern coast of the Sakhalin Island in the Okhotsk Sea is investigated using the AVISO velocity field and oceanographic data for the period from 1993 to 2016. It is found that mesoscale cyclones with the horizontal dimension of about 100 km occur there predominantly during summer, whereas anticyclones occur predominantly during fall and winter. The cyclones are generated due to a coastal upwelling forced by northward winds and the positive wind stress curl along the Sakhalin coast. The anticyclones are formed due to an inflow of low-salinity Amur River waters from the Sakhalin Gulf intensified by southward winds and the negative wind stress curl in the cold season. The mesoscale cyclones support the high biological productivity at the eastern Sakhalin shelf in July– August. 相似文献
53.
A spectral analysis of coronal Faraday rotation (FR) data obtained with the linearly polarized signals of the two Heliosspacecraft reveals that about one-third of the temporal FR spectra contain a distinct spectral line superposed onto the background power-law spectrum. The most prevalent frequency of this quasi-harmonic component (QHC) is about 4 mHz, corresponding to a 4–5 min periodic oscillation of the coronal magnetic field. Physical reasons for the existence of QHC Alfvén fluctuations in the inner solar wind are discussed. FR fluctuations (FRF) are considered to arise from both a turbulent background as well as an isolated Alfvén wave train of finite extent and duration. An estimate can be made for the conditions under which the isolated wave train is observed above the ever present background. It is shown that the wave train must have a sufficiently long duration and transverse wavelength. It is suggested that the QHC at periods near 4–5 min in the FRF spectra are most probably produced by outward-propagating Alfvén waves excited initially in the anisotropic structures of the chromospheric network. 相似文献
54.
This paper analyzes demographic data (the time series of the number of births and deaths for over 50 years in the 20th and
21st centuries). The properties of the time series are revealed, and some of them are explained. A comparison of data for
men and women has resulted in the revelation that seasonal changes for women are more strongly evident than for men. The possible
causes for the differences between the time series of the number of deceased men and women are discussed. 相似文献
55.
V. N. Soyfer V. A. Goryachev D. V. Andreev I. R. Barabanov A. P. Borisov Yu. N. Zhukov E. A. Yanovich 《Oceanology》2010,50(4):600-612
A methodology of experimental simulation of the state of spent nuclear fuel that is situated on the sea bottom as a result
of some catastrophes or dumping is developed. Data on long-term (more than 2000 days) experiments on the estimation of the
85Kr and 137Cs release rate from spent nuclear fuel (fragments of irradiated UO2 pellets) were first obtained; these estimates prove the correctness of the hypothesis put forward by us in the early 1990s
concerning an earlier 85Kr release (by one order of magnitude higher than that of 137Cs) as compared to other fission fragments in the case of the loss of integrity of a fuel containment as a result of corrosion
on the sea bottom. The method and technique of the onboard 85Kr and 137Cs sampling and extraction (as well as the sampling of tritium, a product of triple 235U fission) and their radiometric analysis at coastal laboratories are developed. Priority data on the 85Kr background in the bottom layers of the Barents and Kara Seas and the 137Cs and 3H in these seas (state of 2003) are presented. Models necessary for the estimation of the dilution of the fission products
of spent nuclear fuel and their transport on the bottom in accident and dumping regions are developed. An experimental method
for the examination of the state of spent nuclear fuel on the sea bottom (1 expedition each 2–3 years) by the 85Kr release into the environment (a leak tracer) is proposed; this release is an indicator of the destruction of a fuel containment
and the release of products of spent nuclear fuel in the case of 235UO2 corrosion in sea water. 相似文献
56.
N. V. Emelyanov M. V. Andreev A. A. Berezhnoi A. S. Bekhteva S. N. Vashkovyak Yu. I. Velikodskii I. A. Vereshchagina D. L. Gorshanov A. V. Devyatkin I. S. Izmailov A. V. Ivanov T. R. Irsmambetova V. A. Kozlov S. V. Karashevich A. N. Kurenya Ya. V. Naiden K. N. Naumov N. A. Parakhin V. N. Raskhozhev S. A. Selyaev A. V. Sergeev E. N. Sokov M. Yu. Khovrichev E. V. Khrutskaya M. M. Chernikov 《Solar System Research》2011,45(3):264-277
In 2009, in five Russian observatories photometric observations of Jupiter’s Galilean satellites during their mutual occultations and eclipses were carried out. Based on these observations, an original method was used to ascertain astrometric results such as the difference between the coordinates of pairs of satellites. Fifty-three phenomena were successfully observed. A total of 94 light curves of satellites were measured. The error in the coordinates of satellites due to random errors in photometry, calculated on all data obtained, was 0.041″ in right ascension and 0.046″ in declination. The discrepancies between the theory and observations in these coordinates was found to be 0.060″ and 0.057″, respectively. The results were uploaded to the common database for all observations of natural satellites of planets at the Natural Satellites Data Center (NSDC), which is available online at http://www.sai.msu.ru/neb/nss/index.htm. For the first time in the practice of photometric observations of satellites in epochs of mutual occultations and eclipses a new method of observation was tested, which eliminates from astrometric results the major systematic errors caused by an inaccurate account of the background level. The tests were conducted in the Terskol Observatory and the observatory of the Crimean laboratory of the Sternberg State Astronomical Institute of the Moscow State University. The application of the new method showed that the elimination of the background level at these observatories was carried out correctly. 相似文献
57.
E. P. Pavlenko I. B. Voloshina M. V. Andreev S. Yu. Shugarov A. V. Baklanov O. I. Antonyuk N. A. Parakhin D. A. Samsonov V. G. Metlov 《Astronomy Reports》2010,54(1):6-16
We analyze photometry of the dwarf nova MN Dra carried out using various instruments at four observatories on 18 nights between
May 20 and June 28, 2009. The observations cover a variety of activity states of the system: a superoutburst, three normal
outbursts, and quiescence. Analysis of the system’s light curve during the superoutburst decline reveals positive superhumps
that recur, on average, with a period of 0.105 days and are due to the direct apsidal precession of the accretion disk. These
are observed until the end of the superoutburst, but their period decreases at a rate of −24.5 × 10−5 of the period per period. Both the positive-superhump period and its derivative are in good agreement with estimates made
during previous superoutbursts. At the brightness minimum and in normal outbursts, MN Dra displays brightness variations with
a period of 0.096 days, whose amplitude is much larger during the brightness minimum (0.8
m
–1.5
m
) than during normal outbursts (0.1
m
–0.2
m
). We suggest that these brightness variations could be negative superhumps due to nodal precession of the oblique accretion
disk. 相似文献
58.
The results of the photometric observations of comet C/2009 P1 (Garradd) performed at the 60-cm Zeiss-600 telescope of the Terskol observatory have been analyzed. During the observations, the comet was at the heliocentric and geocentric distances of 1.7 and 2.0 AU, respectively. The CCD images of the comet were obtained in the standard narrowband interference filters suggested by the International research program for comet Hale-Bopp and correspondingly designated the “Hale-Bopp (HB) set.” These filters were designed to isolate the BC (λ4450/67 Å), GC (λ5260/56 Å) and RC (λ7128/58 Å) continua and the emission bands of C2 (λ5141/118 Å), CN (λ3870/62 Å), and C3 (λ4062/62 Å). From the photometric data, the dust production rate of the comet and its color index and color excess were determined. The concentration of C2, CN, and C3 molecules and their production rates along the line of sight were estimated. The obtained results show that the physical parameters of the comet are close to the mean characteristics typical of the dynamically new comets. 相似文献
59.
Vegetation and climate variability during the Last Interglacial evidenced in the pollen record from Lake Baikal 总被引:5,自引:0,他引:5
W. Granoszewski D. Demske M. Nita G. Heumann A.A. Andreev 《Global and Planetary Change》2005,46(1-4):187
A pollen record from the core sediments collected in the northern part of Lake Baikal represents the latest stage of the Taz (Saale) Glaciation, Kazantsevo (Eemian) Interglacial (namely the Last Interglacial), and the earliest stage of the Zyryanka (Weichselian) Glaciation. According to the palaeomagnetic-based age model applied to the core, the Last Interglacial in the Lake Baikal record lasted about 10.6 ky from 128 to 117.4 ky BP, being more or less synchronous with the Marine Isotope Stage 5e. The reconstructed changes in the south Siberian vegetation and climate are summarised as follows: a major spread of shrub alder (Alnus fruticosa) and shrub birches (Betula sect. Nanae/Fruticosae) in the study area was a characteristic feature during the late glacial phase of the Taz Glaciation. Boreal trees e.g. spruce (Picea obovata) and birch (Betula sect. Albae) started to play an important role in the regional vegetation with the onset of the interglacial conditions. Optimal conditions for Abies sibirica–P. obovata taiga development occurred ca. 126.3 ky BP. The maximum spread of birch forest-steppe communities took place at the low altitudes ca. 126.5–125.5 ky BP and Pinus sylvestris started to form forests in the northern Baikal area after ca. 124.4 ky BP. Re-expansion of the steppe communities, as well as shrubby alder and willow communities and the disappearance of forest vegetation occurred at about 117.4 ky BP, suggesting the end of the interglacial succession. The changes in the pollen assemblages recorded in the sediments from northern Baikal point to a certain instability of the interglacial climate. Three phases of climate deterioration have been distinguished: 126–125.5, 121.5–120, and 119.5–119 ky BP. The penultimate cooling signal may be correlated with the cool oscillation recorded in European pollen records. However, such far distant correlation requires more careful investigation. 相似文献
60.
V. M. Somsikov A. B. Andreev B. T. Zhumabaev O. I. Sokolova 《Geomagnetism and Aeronomy》2011,51(1):66-70
A statistical analysis of the variations of three components of the Earth’s magnetic field obtained at Almaty during 2008
is performed. It is found that in the daytime and nighttime periods, a distinct difference in the spectra of variations with
periods corresponding to acoustic-gravity waves is observed. An explanation of this difference is proposed. It is based on
the mechanism of change in the acoustic-gravity wave spectrum caused by the interaction of atmospheric gas with solar radiation. 相似文献