排序方式： 共有37条查询结果，搜索用时 15 毫秒
1.
2.
The problem of the seasonal variations of temperature and salinity in the intermediate zone located between the West African and the Gulf of Guinea upwellings is considered. The vertical distribution of the phase-amplitude characteristics of the annual and semi-annual variations is examined in good detail and their parameters are defined from the monthly means using the least-squares fit technique. The contribution of isopycnic advection to the formation of seasonal thermohaline variations is studied.Translated by Vladimir A. Puchkin. 相似文献
3.
Seasonal and interannual variability of the pressure field and indices of the North Atlantic atmosphere zonal circulation are analysed using historical (1894–1988) observations. It is shown that fluctuations of the index of North Atlantic oscillations (NAO) and that of the eastward transport give evidence of the interannual fluctuations with the typical time scale being 2–7 years. It is shown that the magnitude of interannual NAO index variability exceeds the typical magnitude of seasonal variations, particularly in winter. The time scale of NAO index variations and eastward transport coincides with the typicalEl Niño-southern oscillations (ENSO) temporal scale. The amplitudes of the annual, semi-annual harmonics, and high-frequency fluctuations of the NAO index increase during a typical ENSO event at least by a factor of 2.Translated by V. Puchkin. 相似文献
4.
A. B. Polonsky 《Physical Oceanography》1995,6(1):51-59
The equation for the turbulence kinetic energy balance as applied to the horizontally-inhomogeneous upper ocean layer encompassing the equatorial zone is analysed. A partial solution of the equation has been derived for the equilibrium conditions. Using the equatorial Atlantic as an example, the prime importance of considering the effect of horizontal heterogeneity in calculating the upper mixed layer thickness is shown.Translated by Vladimir A. Puchkin. 相似文献
5.
By using the results of processing of the instrumental data with high space resolution obtained in September 2008, we analyze
the structure of the Rim Current in the upper 100-m layer near the coast of Crimea. We determine the statistical characteristics
of the mesoscale fluctuations of currents according to the data of 1165 vertical probes. It is shown that the kinetic energy
of intense mesoscale perturbations observed in the vicinity of the Rim Current is of the same order of magnitude as the kinetic
energy of the mean current. 相似文献
6.
A. B. Polonsky 《Physical Oceanography》1995,6(1):1-7
Alexander I. Felzenbaum (13 February 1922–2 January 1993)Stages of scientific activity and contribution to the theory of marine currents 相似文献
7.
Izvestiya, Atmospheric and Oceanic Physics - A modified technique for calculating the amplitude-phase characteristics of the seasonal cycle and long-term trends in the intensity of upwelling is... 相似文献
8.
Izvestiya, Atmospheric and Oceanic Physics - Long-term trends in the sea surface temperature in the Canary upwelling zone and their causes are analyzed on the basis of satellite data from the 1980s... 相似文献
9.
According to Ocean Re-Analysis System 3 (ORA-S3) data, all components of the annual mean heat budget of the upper quasi-homogeneous ocean layer (UQL) in the North Atlantic for the period of 1959–2011 have been calculated and errors of these estimates have been determined. It has been shown that the contribution of the horizontal eddy diffusivity (estimated as a residual term of the UQL heat balance equation) to changes in the UQL annual mean temperature is significantly overestimated. This takes place mainly due to neglecting the covariances of seasonal fluctuations of current velocity vector components and UQL temperature gradients in calculations carried out with the use of annual average values. These covariances play an important role in the annual mean heat budget in some regions of the North Atlantic, especially in tropical latitudes. Changes in the annual average UQL temperature in the central and eastern parts of the North Atlantic are significantly affected by errors related to an inaccuracy of estimates of annual average heat fluxes on the ocean surface. The maximum contribution of the horizontal eddy diffusivity to the interannual variability of the UQL temperature is observed in the northwestern part of the North Atlantic and the region of the Subpolar Gyre. 相似文献
10.
On the basis of the results of processing of the archival hydrological data, we analyze the seasonal behavior of geostrophic
circulation in the Black Sea and its long-term variations. It is shown that the variations of currents on the decadal time
scales with different manifestations in different seasons lead to changes in the characteristics of the seasonal course of
geostrophic circulation in the second half of the last century. The intensification of winter circulation and weakening of
summer circulation observed since the mid-1970s result in the increase in the amplitude of the annual course of current velocity
on the sea surface. We also discuss possible causes of variations in the intensities of geostrophic currents in the Black
Sea. 相似文献