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The results of direct measurements of turbulent fluxes at Bellingshausen station (the Antarctic) in the summer of 2002, 2003, 2007, and 2009 are considered. The features of energy exchange are studied for these seasons. The interannual and intraseasonal variability of energy exchange characteristics is investigated. It is found that heat fluxes depend on the surface state and on the wind direction. Also, as a rule, they have a clear diurnal course with negative or near-zero values at night and with positive values in the daytime, when intensive convective fluxes are observed over open ground. The momentum flux is defined by the wind direction and wind speed and by stratification conditions. The main factors affecting energy exchange between the atmosphere and the surface in the Antarctic coastal zone are synoptic conditions and the surface state (snowless season duration and moss cover presence). 相似文献
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Chechin D. G. Artamonov A. Yu. Bodunkov N. E. Zhivoglotov D. N. Zaytseva D. V. Kalyagin M. Yu. Kouznetsov D. D. Kounashouk A. A. Shevchenko A. M. Shestakova A. A. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(5):526-532
Izvestiya, Atmospheric and Oceanic Physics - The growing relevance of the use of unmanned aerial vehicles (UAVs) for studying turbulence in the atmospheric boundary layer (ABL) is associated with... 相似文献
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Photographic measurements of the colour distribution in the irregular galaxy M82 are presented and interpreted in terms of a model of that galaxy. Two alternative models are discussed. In the first the galaxy consists of a disc of highly reddened OB-stars, whose scattered light is also seen in the halo, and a bulge of less reddened A—F stars. The direction of the inclination of the system, as inferred from this model, is opposite to that of LYNDS and SANDAGE (1963). The alternative inclination (second model) may possibly be preserved if one assumes a central dust ellipsoid reemitting scattered light from a central source of OB stars. If the velocities of the line emitting material refer to scattering particles, an inward motion of them is more probable than an outward one, irrespectively of the model, and the (dust) halo of the galaxy is probably contracting. 相似文献
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N. P. Bulgakov V. V. Ukrainsky Yu. I. Popov P. D. Lomakin Yu. V. Artamonov 《Physical Oceanography》2001,11(5):447-457
On the basis of the data of the complex oceanographic experiment carried out in the course of the second Ukrainian Antarctic
expedition in March 1998, we study the structure and kinematics of waters in the region of the archipelago of Argentine Islands.
The regularities of thermohaline stratification of waters are discovered. We determine the most important environmental parameters
premoting the variability of hydrophysical fields on time scales varying from several days up to a week, analyse the data
of actual observations over the currents, and estimate the relative contribtions of diurnal and semidiurnal tidal waves to
the total dispersion of hydrophysical parameters of the environment. The residual currents are filtered out. We propose a
hypothesis about the mechanism of their formation. Various types of tidal currents are revealed and the directions of propagation
of diurnal and semidiurnal tidal waves are determined.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
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Yu. V. Artamonov N. P. Bulgakov P. D. Lomakin E. A. Skripaleva 《Physical Oceanography》2006,16(5):299-311
We study the seasonal and interannual variations of the field of sea-surface temperature (SST) in the Southwest Atlantic on
the basis of the analysis of three data arrays, namely, the Levitus-Boyer-1994 hydrological array, the WOD-98 actual database,
and the data of satellite measurements of SST. We perform the comparative analysis of the amplitude-phase characteristics
of the annual course of the SST field and discuss the distinctive features of its seasonal and interannual variations. It
is shown that the results obtained by using different data arrays are in good agreement. The values of the coefficient of
linear correlation are equal to 0.7–0.9. It is discovered that the maximum seasonal variations of SST are observed in the
zone of confluence of the Falkland and Brasil Currents in the vicinities of the South Subtropical and Antarctic Polar fronts.
The minimum seasonal variations are recorded in the Antarctic region and in the Weddell Sea. The satellite data demonstrate
that the level of interannual variability is high in the zones of climatic fronts.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 5, pp. 62–76, September–October, 2006. 相似文献
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On the basis of the climatic array of hydrological annual and monthly average data on temperature and the data of satellite
observations of the surface temperature of the ocean, we refine the annual average structure of the temperature fronts and
study their seasonal variability in the east part of the Tropical Atlantic in the meridional sections made along 30, 20, and
10°W, 0°, and 10°E. It is shown that the maximum intensity and seasonal variations are typical of the North Subequatorial
and South Tropical Fronts varying with predominant annual period. We revealed a delay of 2–3 months in the attainment of the
maximum intensity of the South Tropical and South Subequatorial Fronts in the west-east direction. Various mechanisms specifying
the seasonal variability of the surface and subsurface North and South Subequatorial Fronts are discussed. There exists good
agreement between the specific features of the seasonal variability of characteristics of the fronts established according
to the hydrological and satellite data.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 46–59, March–April, 2005. 相似文献
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Microlensing variability in FBQ 0951+2635: short-time-scale events or a long-time-scale fluctuation?
V. N. Shalyapin L. J. Goicoechea E. Koptelova B. P. Artamonov A. V. Sergeyev A. P. Zheleznyak T. A. Akhunov O. A. Burkhonov S. N. Nuritdinov A. Ullán 《Monthly notices of the Royal Astronomical Society》2009,397(4):1982-1989
We present and analyse new R -band frames of the gravitationally lensed double quasar FBQ 0951+2635. These images were obtained with the 1.5-m AZT-22 Telescope at Maidanak (Uzbekistan) during the 2001–2006 period. Previous results in the R band (1999–2001 period) and the new data allow us to discuss the dominant kind of microlensing variability in FBQ 0951+2635. The time evolution of the flux ratio A / B does not favour the continuous production of short-time-scale (∼months) flares in the faintest quasar component B (crossing the central region of the lensing galaxy). Instead of a rapid variability scenario, the observations are consistent with the existence of a long-time-scale fluctuation. The flux ratio shows a bump during the 2003–2004 period and a quasi-flat trend in more recent epochs. Apart from the global behaviour of A / B , we study the intra-year variability over the first semester of 2004, which is reasonably well sampled. Short-time-scale microlensing is not detected in that period. Additional data in the i band (from new i -band images taken in 2007 with the 2-m Liverpool Robotic Telescope at La Palma, Canary Islands) also indicate the absence of short-time-scale events in 2007. 相似文献