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V. I. Byshev V. G. Neiman I. V. Serykh A. D. Shcherbinin 《Russian Meteorology and Hydrology》2007,32(3):183-193
On the basis of long series of contemporary instrumental measurements, the dynamics of waters in the western boundary current of the Indian Ocean is studied. For the first time, the background (quasi-stationary) circulation is estimated, and summer and winter monsoon components of the velocity field are detected. It is shown that the features of water dynamics of the Somali Current pattern are caused by the intensification of circulation during the summer phase, when the background and monsoon velocity fields with the same sign of vorticity are superimposed on each other. During the winter phase, on the contrary, superposition of background and monsoon circulations, with the opposite signs, is associated with a weakening of the resultant velocity of the currents. 相似文献
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Phase variability of some characteristics of the present-day climate in the northern atlantic region
Study of the variability of the present-day climate based on statistical analysis of a century-long sequence of experimental hydrometorological data has shown that its phase state is subdivided into three subsets. Each of these subsets is particular to its thermodynamic characteristics and should be considered as an individual climatic scenario. The basic result of the study was obtained by estimation of evolution of the phase trajectory of parameters of thermodynamic conditions of the Northern Atlantic climate system that directly influences a vast area of the Eurasia continent. The three climate scenarios were attributed to periods of 1905–1935 (relatively warm phase), 1940–1970 (cool phase), and 1980–2000 (warm phase). According to our analysis and some independent indications [1], we believe that, in the first decade of the current century in the Northern Atlantic, a transition to a new (relatively cool?) climate scenario began, which appears likely to continue until 2030–2035.
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The statistical analysis of the secular hydrometeorological data sets revealed a particular El Niño impact on the climatic system of the Indian Ocean domain. The spatial distribution of the sequent anomalies showed prominent local effects depending on the climatic season as well. The El Niño signal turned out to be better visible within the considered fields during the transitional phases of the Indian monsoon, when its activity is rather weak, unstable, or even almost absent. The hints of certain phase shifts found to appear in the monsoon cycle coincided timely with the El Niño event. First of all, this concerns the hamper effect, which being applied to the wind stress field in the spring season leads to the later onset of the wet southwest monsoon, which is accompanied by a precipitation shortage over huge inhabited territories. During the northeast monsoon, the equatorial-tropic part of the domain is affected by El Niño in such a way that the eastern near surface air transport arises and after this the Winter Monsoon Equatorial Current notably increases its speed. Quantitative estimations showed that the El Niño signal’s relative energy in the Indian Ocean area is nearly an order of magnitude lower when compared to the total monsoon energy. This implies that the total impact of El Niño upon the Indian Ocean domain’s climate system could not lead to a fundamental change of its regime, as, for example, a reversal of the monsoon circulation. 相似文献
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During study of the physical nature and potential precursor features of the El Ni?o phenomenon in the Pacific, it was found that a negative large-scale temperature anomaly on the Indian Ocean surface may be one of its significant precursors. This anomaly appears prior to the occurrence of El Ni?o and is accompanied by growth in atmospheric pressure. It gradually extends eastwards along the equator until the zone of planetary convection in the area of the Indonesian Region. The west wind that emerges on the eastern peripherals of the mentioned pressure anomaly leads to reversal of the Pacific segment of the Walker equatorial atmospheric circulation and to a subsequent change in the zonal thermal dipole polarity in the tropical zone of the Pacific (the latter means culmination of the El Ni?o phenomenon). In addition to the mentioned thermobaric anomaly in the Indian Ocean, other obvious signs of large-scale pressure anomalies have been found in the global atmospheric pressure field; these anomalies may be interpreted as manifestations of the intradecadal global oscillation in the dynamics of the modern climatic system. It is suggested that the whole known complex of events related to the El Ni?o phenomenon in the Pacific is a consequence and a regional link of the planetary structure of this global atmospheric phenomenon. 相似文献
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Oceanology - To study the nature of climate change in the hydrometeorological parameters of the Black and Azov Seas—surface air temperature (SAT), sea surface temperature (SST), ice cover,... 相似文献
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