We investigate the lag between warm interannual Sea Surface Temperature (SST) events in the eastern‐equatorial Atlantic, the Atlantic Niños, and the occurrence of Benguela Niños along the southwestern Angolan coast. While it is commonly agreed that both events are associated with equatorial and subsequent coastal‐trapped wave propagations driven remotely by a relaxation of the trade‐winds, it is surprising that SST anomalies off Angola tend to precede the ones in the eastern‐equatorial sector by ~1 month. To explain this counterintuitive behavior, our methodology is based on the experimentation with a Tropical Atlantic Ocean model. Using idealized wind‐stress perturbations from a composite analysis, we trigger warm equatorial and coastal events over a stationary and then, seasonally varying ocean mean‐state. In agreement with the linear dynamics, our results show that when the interannual wind‐stress forcing is restricted to the western‐central equatorial Atlantic, the model yields equatorial events leading the coastal ones. This implies that neither the differences in the ocean stratification between the two regions (thermocline depths or modal wave contributions) nor the seasonal phasing of the events explains the observed temporal sequence. Only if wind‐stress anomalies are also prescribed in the coastal fringe, the coastal warming precedes the eastern‐equatorial SST anomaly peak, emphasizing the role of the local forcing in the phenology of Benguela Niños. A weaker South‐Atlantic Anticyclone initiates the coastal warming before the development of eastern‐equatorial SST anomalies. Then, equatorward coastal wind anomalies, driven by a convergent anomalous circulation located on the warm Atlantic Niño, stop the remotely forced coastal warming prematurely.

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为什么BenguelaNiños领导大西洋Niños？

我们调查了赤道东大西洋，大西洋尼诺斯与西南安哥拉沿海本格拉·尼诺斯的发生之间的暖年际海表温度（SST）事件之间的滞后。尽管人们普遍认为这两个事件都与贸易风的放松导致的赤道及随后的沿海陷波传播有关，但令人惊讶的是，安哥拉海表温度异常趋向于先于赤道东部。大约1个月。为了解释这种违反直觉的行为，我们的方法基于热带大西洋模型的实验。利用综合分析中理想的风应力摄动，我们在平稳的，然后是季节性变化的海洋平均状态下触发了赤道和沿海暖事件。与线性动力学一致，我们的结果表明，当年际风应力强迫仅限于赤道中西部大西洋时，该模型产生的赤道事件领先于沿海事件。这意味着，两个区域之间海洋分层的差异（热线深度或模态波贡献）和事件的季节性分相都不能解释观测到的时间序列。只有在沿海边缘也规定了风应力异常的情况下，沿海变暖才出现在赤道东部赤道海温异常峰值之前，强调了局部强迫在本格拉·尼尼奥斯（BenguelaNiños）物候学中的作用。较弱的南大西洋反气旋在东赤道海温异常发展之前就开始了沿海变暖。然后，赤道沿海风异常，