Correlation between the low-frequency variability of surface temperature and the heat flux through the surface in the North Atlantic     

V. V. Efimov  A. V. Prusov  M. V. Shokurov 《Physical Oceanography》1999,9(6):453-464

Using the data of UWM/COADS (University of Wisconsin-Milwaukee/Comprehensive Ocean—Atmosphere Data Set), we have performed cluster and spectral analyses of the average monthly anomalies of temperature and heat balance of the surface of the Atlantic Ocean in three frequency ranges (intraannual, interannual, and decadal). It is shown that these anomalies are closely related on intraannual scales, where the anomalies of the surface temperature of the ocean can be regarded as a result of the direct local generation by heat balance anomalies. The generation mechanism is explained within the known Hasselman model [1, 2]. On interannual scales, this mechanism is not valid, and nonlocal effects related to heat advection become important. On decadal scales, the local generation of anomalies of the surface temperature of the ocean is insignificant, local correlation between fluctuations of heat balance and the surface temperature of the ocean is completely broken, and the spatial structure of anomalies of the surface temperature of the ocean is governed by the global system of currents, which redistributes heat flux from the ocean to the atmosphere. Violations of the local correlation between anomalies of heat balance and the surface temperature of the ocean are observed on intraannual scales in regions with powerful jet currents and in the equatorial region. In some parts of the World's ocean with weak advection, the correlation between heat balance and the surface temperature of the ocean persists up to a decadal period. Translated by Peter V. Malyshey and Dmitry V. Malyshey  相似文献   

On the formation of atmospheric seasonal precipitation in the Black Sea region     

V. V. Efimov  E. S. Shakalova 《Physical Oceanography》2008,18(4):204-211

The climatic features of the formation of precipitation and their correlation with the baric situation in the Atlantic-European sector are studied on the basis of the data of the Sevastopol and Feodosiya coastal hydrometeorological stations. As the source data, we use the data arrays of daily precipitation at these stations in 1900–2005 and the data of reanalysis of the fields of atmospheric pressure in the Atlantic-European sector. The comparative statistical analysis of daily precipitation for the wet and dry summer and winter seasons and the estimates of extremely high levels of precipitation for the specified periods of repeatability are presented. The existence of the dependence of occurrence of wet and dry winter seasons in Sevastopol and Feodosiya on the large-scale baric fields in the Atlantic-European sector is confirmed. Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 43–51, July–August, 2008.  相似文献   

Development of the sea breeze as a gravity current in the atmosphere over the Crimea     

V. V. Efimov  V. S. Barabanov  A. V. Krupin 《Russian Meteorology and Hydrology》2011,36(9):590-595

The development of the sea breeze in the Crimea during the day is studied on the basis of the mesoscale atmospheric circulation modeling. It is revealed that the formation of gravity currents directed from the banks to the center of the peninsula is observed for the cases of the weak atmospheric circulation. The results of the simulation for August 4, 2007 illustrating this phenomenon are presented. The wind speeds and velocities of the breeze front propagation are determined.  相似文献   

Climatic structure of the wind fields in the Black-Sea region     

V. V. Efimov  A. E. Anisimov  V. S. Barabanov 《Physical Oceanography》2011,21(3):153-162

For the Black-Sea region, we perform the dynamic reanalysis of the data on atmospheric circulation for the period 1958–2001 by using the HadRM3P model with a space resolution of 25 km. We estimate the mean climatic atmospheric fields of vorticity and divergence of the wind velocity and study their space structure and seasonal variability. The climatic estimates of the annual course of vorticity of the wind velocity over the sea are presented. The obtained large annual average values of vorticity of the velocity reveal the predominant role played by the wind action in the generation not only of the seasonal variability but also of the mean cyclonic circulation of waters in the Black Sea.  相似文献   

Structure and evolution of the Earth’s crust in the region of junction of the Central Asian Fold Belt and the Siberian Platform: Skovorodino–Tommot profile     

A.N. Didenko  A.S. Efimov  P.A. Nelyubov  A.S. Sal’nikov  V.S. Starosel’tsev  B.F. Shevchenko  M.V. Goroshko  V.A. Gur’yanov  N.G. Zamozhnyaya 《Russian Geology and Geophysics》2013,54(10):1236-1249

An integrated geological and geophysical study was performed to investigate the region of junction of the eastern part of the Central Asian Fold Belt and the Siberian Platform in the Skovorodino–Tommot 3-DV reference profile line (52°–60° N, 122°–129° E), where the belt is separated from the Aldan–Stanovoi Shield of the Platform by a series of deep faults. The main results are as follows: Seismic, density, and geoelectric characteristics of rocks were obtained and used to determine (refine) the intracrustal boundaries of tectonic structures; large-block structure of the Earth’s crust, caused by mantle faults, and the difference between the layered structure of the crust for the shield and fold regions were established; and available paleomagnetic data were used to perform palinspastic reconstructions for 180 and 140 million years, the most productive metallogenic epoch in the region, coeval with collision processes at the closure of the Mongol-Okhotsk paleobasin.  相似文献   

New Sm-Nd and Rb-Sr (ID-TIMS) isotope data for apatite-phlogopite clinopyroxenites from the dunite “Core” of the Konder Massif, Aldan Shield, Yakutia     

A. A. Efimov  Yu. L. Ronkin  K. N. Malich  G. A. Lepikhina 《Doklady Earth Sciences》2012,445(2):956-961

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Comet C/2002 T7 (LINEAR): Polarimetric and photometric studies     

V. K. Rosenbush  F. P. Velichko  N. N. Kiselev  S. F. Velichko  N. M. Shakhovskoy  Yu. S. Efimov  K. A. Antonyuk  S. V. Kolesnikov  D. N. Shakhovskoy 《Solar System Research》2006,40(3):230-238

We present the results of polarimetric and photometric observations of dynamically new comet C/2002 T7 (LINEAR) at phase angles from 6° to 26°. During the observations, the comet was at a distance of 2.7–1.3 AU from the Sun and 1.7–2.0 AU from the Earth. The aperture polarimetry was made with the 2.6-m Shain telescope and the 1.25-m AZT-11 telescope of the Crimean Astrophysical Observatory and with the 0.7-m telescope of the Astronomical Institute of the Kharkiv National University during the period from November 21, 2003, to February 21, 2004. The wideband UBVRI and WRC (λ7228/1142 Å) filters and the narrowband GC (λ5260/56 Å) filter were used. The photometric observations of the comet were carried out on February 21, 2004, with narrowband filters isolated the BC (λ4845/65 Å) and RC (λ6840/90 Å) continuum and the C₂ emission (λ5140/90 Å). The phase-angle dependence of linear polarization of the comet has been obtained, and its parameters, such as the minimal polarization P _min = ?1.63%, the phase angle of the minimal polarization α_min = 10.6°, the inversion angle α_inv = 22.7°, and the slope of the phase curve at the inversion angle h = 0.24% per degree, were found. From the photometric observations, the following quantities have been obtained: the column density of molecules C₂ in the line of sight logN (C₂) = ?9.15 mol/cm² and their production rate log Q (C₂) = 27.11 mol/s, the spectral gradient of reflectivity for the dust S′(BC, RC) ≈ 3%/1000 Å, and the dust production parameter Afρ equal to 371 and 273 cm for the blue and red continuum ranges, respectively. According to these results, the physical parameters of comet C/2002 T7 are close to the average characteristics of typical dusty comets.  相似文献   

Breeze circulation in the Black Sea region     

V. V. Efimov  A. V. Krupin 《Russian Meteorology and Hydrology》2016,41(4):240-246

The modeling of atmospheric circulation in the Black Sea region using the WRF-ARW model for 30 summer days is considered to single out the contribution of the breeze component of wind speed. Assuming the quasiperiodic nature of breeze, the speed of daytime and nighttime breeze is computed for the whole region and for five separate areas on the coast. Specific features of the formation of daytime and nighttime breeze in these areas are distinguished. It is revealed that the presence of coastal mountains and the complex coastline determine the typical features of breeze development.  相似文献   

Granitoid magmatism and hydrous metamorphism in the history of the Uralian platinum belt: Sm-Nd (ID-TIMS) isotope constraints     

A. A. Efimov  Yu. L. Ronkin  O. P. Lepikhina 《Doklady Earth Sciences》2010,435(2):1586-1591

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Changes in climate extremes on the territory of Siberia by the middle of the 21st century: An ensemble forecast based on the MGO regional climate model     

I. M. Shkol’nik  V. P. Meleshko  S. V. Efimov  E. N. Stafeeva 《Russian Meteorology and Hydrology》2012,37(2):71-84

The results are analyzed of the ensemble forecast of temperature and precipitation extremes on the territory of Siberia by the middle of the 21st century based on the regional climate model of the Main Geophysical Observatory (MGO) with the resolution of 25 km. The results of computation of oceanic components of CMIP3 coupled models are used as the boundary conditions on the sea surface. It is demonstrated that the high resolution of the regional model enables to simulate the observed climate variability in a more realistic way as compared to the low-resolution models. The analysis of the signal-to-noise ratio for future climate changes made it possible to determine to which degree its internal variability for various time scales (from interannual to interdecennial one) bounds the potential of the ensemble to compute the statistically significant anthropogenic changes of extremes. A comparative analysis of variations of extreme and average seasonal characteristics of the Siberian climate is carried out.  相似文献