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首页> 外文期刊>Physical Oceanography >LOW-FREQUENCY VARIATIONS OF THE CHARACTERISTICS OF PYCNOCLINE IN THE NORTH ATLANTIC AND THEIR CORRELATION WITH THE NORTH-ATLANTIC OSCILLATION
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LOW-FREQUENCY VARIATIONS OF THE CHARACTERISTICS OF PYCNOCLINE IN THE NORTH ATLANTIC AND THEIR CORRELATION WITH THE NORTH-ATLANTIC OSCILLATION

机译：大西洋北大西洋火山活动特征的低频变化及其与北大西洋涛动的关系

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摘要

On the basis of processing of the oceanographic data accumulated for the water area of the North Atlantic in 1950-1999 (～500,000 stations), we study seasonal and interannual variations of the principal characteristics of pycnocline within the range of σ_t = 25.5-27.5 conventional densityrnunits. It is shown that the interannual oscillations of these characteristics in the entire analyzed layer can be regarded as a superposition of fluctuations with periods from 2-3 to 10-12 yr. The typical ranges of these fluctuations for the depths of occurrence of isopycnic surfaces and the corresponding temperature and salinity are equal to 20-25 m, 1-1.5℃, and 0.25‰, respectively. The intensification of atmospheric circulation at middle latitudes is accompanied by the simultaneous deepening of the pycnocline and its heating in the central part of the North Subtropical Anticyclonic Gyre. At the same time, the process of weakening of the atmospheric circulation leads to the rise of the pycnocline and its cooling. The complete cycle of interaction of the North-Atlantic Oscillation with the anomalies of isopycnic characteristics (with regard for the period of their advection) is equal to ～ 6-8 yr.
机译：在处理1950-1999年北大西洋水域（〜500,000个站）积累的海洋学数据的基础上，我们研究了比索克辛的主要特征在σ_t= 25.5-27.5范围内的季节性和年际变化。密度单位结果表明，这些特征在整个分析层中的年际振荡可以看作是周期从2-3年到10-12年的波动的叠加。等渗表面的出现深度以及相应的温度和盐度的这些波动的典型范围分别等于20-25 m，1-1.5℃和0.25‰。中纬度地区大气环流的加剧伴随着比考克林的同时深化及其在北亚热带反气旋涡旋中心的加热。同时，大气环流减弱的过程会导致比考克林上升和冷却。北大西洋涛动与等渗特征异常（就平流周期而言）相互作用的完整周期等于〜6-8年。

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  • 来源
    《Physical Oceanography》 |2007年第3期|89-106|共18页
  • 作者

    G. F. Dzhiganshin; A. B. Polonskii;

  • 作者单位

    Marine Hydrophysical Institute, Ukrainian Academy of Sciences, Sevastopol;

    Marine Hydrophysical Institute, Ukrainian Academy of Sciences, Sevastopol;

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