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Seasonal fluctuations in the deep central equatorial Atlantic Ocean: a data-model comparison

机译：赤道中部大西洋深部的季节性波动：数据模型比较

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摘要

Low-frequency current fluctuations in the deep central equatorial Atlantic are analyzed using current meter measurements recorded from November 1992 to November 1994. Current meters were located at about 14°W of longitude and 1° of latitude on both sides of the equator between 1,700 m depth and the ocean bottom. At all sampling depths, the velocity fluctuations are dominantly zonal and symmetrical with respect to the equator. At 1,700 and 2,000 m, the flow is dominated by annual period fluctuations, at 3,000 m, the velocity field amplitude presents a minimum, and at 3,750 and 3,950 m, the flow is modulated by annual and semiannual period variability. The annual signal exhibits an apparent upward phase propagation. When considering the phase and the amplitude of the seasonal fluctuations, the data compare well with the outputs of a realistic numerical simulation of the Atlantic Ocean. Together with a previous analysis of the model simulations, this supports the idea that the observed annual fluctuations are due to wind-forced vertically propagating Kelvin and Rossby waves. Data and model do not provide deciding evidences of the presence of semiannual equatorial waves deeper than 3,500 m depth in the central equatorial Atlantic Ocean.
机译：使用1992年11月至1994年11月记录的电流表测量数据分析了赤道中部大西洋深处的低频电流波动。电流表位于赤道两侧约1700 m处的经度约14°W和纬度1°处。深度和海底。在所有采样深度，速度波动主要是纬向的，并且相对于赤道是对称的。在1,700和2,000 m处，流量以年周期波动为主，在3,000 m处，速度场振幅呈现最小值，在3,750和3,950 m处，流量受到年和半年周期变化的影响。年度信号表现出明显的向上相位传播。当考虑季节性波动的相位和幅度时，该数据与大西洋实际数值模拟的输出进行了很好的比较。连同对模型仿真的先前分析一起，这支持了这样的想法，即观测到的年度波动是由于风的垂直传播开尔文波和罗斯比波引起的。数据和模型未提供在中央赤道大西洋中存在深度大于3500 m的半年赤道波的决定性证据。

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