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A. B. Polonskii S. B. Krasheninnikova D. V. Basharin 《Russian Meteorology and Hydrology》2017,42(10):653-660
Average long-term and average annual values of meridional Ekman heat (mass) transport are estimated using the NCEP/NCAR (for 1948-2014) and 20CR (for 1871-2012) atmospheric reanalyses, and their interdecadal variability is analyzed. It was corroborated that the typical period of interdecadal variability of meridional Ekman transport in the North Atlantic coincides with that of the Atlantic Multidecadal Oscillation (AMO) and is about 60 years. The strengthening of northeastern trade winds and westerlies accompanied by the development of the negative phase of AMO occurred in the 1880s-1920s and in the 1960s-1990s. The opposite trend is observed for the 1930s-1950s and for the period from the 1990s till the beginning of the 21st century. 相似文献
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North Atlantic Oscillation: Description,Mechanisms, and Influence on the Eurasian Climate 总被引：1，自引：0，他引：1
Polonskii A. B. Basharin D. V. Voskresenskaya E. N. Worley S. 《Physical Oceanography》2004,14(2):96-113
The present work is devoted to the characteristic of the North-Atlantic Oscillation and the analysis of the state-of-the-art of this problem. In the survey section of the work, we deal with the following issues: the definition of the North Atlantic and Arctic Oscillations, their interaction with oceanic processes, and their influence on the variations of climate in Eurasia. In addition, by using the COADS (Comprehensive Ocean Atmosphere Data Set) data and the data on the discharge of European and Asian rivers, we establish some new original results. It is confirmed that the anomalies of the sea-surface temperature are consequences of the integral response of the ocean to the preceding atmospheric actions and that the spectra of these anomalies are characterized by the presence of significant peaks within the band of periods of 10–20 yr. These periods correspond to inherent oceanic variability. The atmospheric response manifests itself in the form of abnormal conditions over the catchment areas of European and Asian rivers, which leads to oscillations of their discharges. As a result of the intensification of the North Atlantic Oscillation and the displacement of the centers of action of the atmosphere in the 60–90s of the previous century, the influence of this oscillation on the climatic conditions in the European-Asian region became more intense. 相似文献
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Polonskii A. B. Voskresenskaya E. N. Basharin D. V. Mikhailova N. V. 《Physical Oceanography》2003,13(3):171-182
On the basis of reanalysis of the data of the European Center of Medium-Range Weather Forecasts for 1979–1993, we study the relationship between the interannual and intramonthly variability of the fields of surface temperature and pressure in the Atlantic-European region and the Southern Oscillation (SO). In spring, the SO is responsible for 25% of the variance of surface temperature for periods of 8–30 days in the east part of Europe and in the Mediterranean region. In this case, the zonal circulation over the North Atlantic is intensified, which manifests itself in the deepening of the Iceland Low and Azores High. For low indices of SO, 8–15-day temperature fluctuations are predominant over the Black-Sea region. At the same time, 3–4-week fluctuations are predominant over West Mediterranean. An important role in the formation of abnormal temperature conditions in the analyzed region is payed by the events of La Niño. 相似文献
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On the basis of the 1950–2001 NCEP reanalysis data, space-time variability of the surface pressure (SP), surface air temperature (SAT), and precipitation fields in Eurasia is studied in connection with the 1976–1977 climate shift. The effect of the shift manifests itself in the change in the space-time structure of empirical orthogonal functions (EOFs) in all these fields from September to April. For SP and SAT, during this period, only two first EOFs are stable with respect to the climate shift. Also, for SAT and SP, the second EOFs are stable from November to April and from September to December, respectively. For the precipitation field, even the first EOFs are unstable during the whole period, with the exception of January and February. Instability with respect to the climate shift appears first in change in the EOF spatial pattern of the fields. Stability of the first modes of the Eurasian meteorological fields to the 1976–1977 climate shift is caused by a relative stability of the North Atlantic Oscillation, which explains up to 70 and 30% of variance of the first and second EOFs, respectively, of the hydrometeorological fields in the region. 相似文献
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D. V. Basharin 《Physical Oceanography》2004,14(5):313-319
On the basis of reanalysis of the data of the European Center of Medium-Range Weather Forecasts for 1979–1993, the interannual and monthly variability of the surface air temperature (SAT) in the European-Mediterranean region for summer and autumn with regard for the influence of the North Atlantic (NAO) and Southern (SO) Oscillations have been studied. The NAO manifests itself on a significant level from August to October and is responsible for up to 55% of the variance of monthly average SAT in the north part of the European region. This phenomenon is caused by the intensification of zonal circulation and enhanced transport of warm Atlantic air masses to Northern Europe. A general trend toward a decrease in the variance of monthly average SAT in the mature phase of the NAO is observed over the most part of Europe. In this case, the NAO is responsible for up to 35% of monthly fluctuations of SAT in summer, up to 45% in September, and up to 65% in October. As the SO index sharply decreases and an event of El Niño develops in the Pacific, the maximum variance of SAT in the European-Mediterranean region in summer significantly increases within the two-week range of variability. Up to 25% of the variance of fluctuations of SAT in summer within the indicated range of variability are, in this case, induced by the SO.Translated from Morskoi Gidrofizicheskii Zhurnal, No. 5, pp. 64–70, September–October, 2004.This revised version was published online in May 2005 with corrections to cover date. 相似文献
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Yu. A. Prokhorenko B. N. Krasheninnikov E. A. Agafonov V. A. Basharin 《Physical Oceanography》1994,5(2):133-139
Data compiled in the course of hydro-optical studies are reported. The main interest is focused on the problem of the existence of a deep turbid layer (DTL) over the continental slope, where it is better pronounced than in the central Black Sea. Analysis of the collected data allows a supposition as to the relationship between the DTL structure and the peculiarities of water dynamics.Translated by Vladimir A. Puchkin. 相似文献
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