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首页> 外文期刊>Journal of Climate >Dynamical Ocean Forcing of the Madden-Julian Oscillation at Lead TimesTI Dynamical Ocean Forcing of the Madden-Julian Oscillation at Lead Times of up to Five Months
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Dynamical Ocean Forcing of the Madden-Julian Oscillation at Lead TimesTI Dynamical Ocean Forcing of the Madden-Julian Oscillation at Lead Times of up to Five Months

机译：交货期前的马登－朱利安涛动的动力海洋强迫TI交货期前的五个月的摩登－朱利安涛动的动力海洋动力

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摘要

The authors show that a simple three-dimensional ocean model linearized about a resting basic state can accurately simulate the dynamical ocean response to wind forcing by the Madden-Julian oscillation (MJO). This includes the propagation of equatorial waves in the Indian Ocean, from the generation of oceanic equatorial Kelvin waves to the arrival of downwelling oceanic equatorial Rossby waves in the western Indian Ocean, where they have been shown to trigger MJO convective activity. Simulations with idealized wind forcing suggest that the latitudinal width of this forcing plays a crucial role in determining the potential for such feedbacks. Forcing the model with composite MJO winds accurately captures the global ocean response, demonstrating that the observed ocean dynamical response to the MJO can be interpreted as a linear response to surface wind forcing. The model is then applied to study "primary" Madden-Julian events, which are not immediately preceded by any MJO activity or by any apparent atmospheric triggers, but have been shown to coincide with the arrival of downwelling oceanic equatorial Rossby waves. Case study simulations show how this oceanic equatorial Rossby wave activity is partly forced by reflection of an oceanic equatorial Kelvin wave triggered by a westerly wind burst 140 days previously, and partly directly forced by easterly wind stress anomalies around 40 days prior to the event. This suggests predictability for primary Madden-Julian events on times scales of up to five months, following the reemergence of oceanic anomalies forced by winds almost half a year earlier.
机译：作者表明，关于静止基本状态线性化的简单三维海洋模型可以准确地模拟马登-朱利安振动（MJO）对强迫作用的动态海洋响应。这包括赤道波在印度洋的传播，从海洋赤道开尔文波的产生到印度洋西部下降的海洋赤道罗斯比波的到来，已证明它们触发了MJO对流活动。用理想风强迫进行的模拟表明，这种强迫的横向宽度在确定这种反馈的可能性方面起着至关重要的作用。用复合MJO风强迫模型可以准确地捕获全球海洋响应，表明观测到的对MJO的海洋动力响应可以解释为对地表强迫的线性响应。然后将该模型用于研究“主要的” Madden-Julian事件，这些事件并未立即发生任何MJO活动或任何明显的大气触发，但已被证明与海底赤道Rossby波的到来一致。案例研究模拟表明，这种海洋赤道罗斯比波活动的一部分是由140天前的西风爆发触发的海洋赤道开尔文波的反射所致，另一部分是在事件发生前40天左右由东风应力异常直接引起的。这表明在半年前因风引起的海洋异常现象再次出现之后，主要的Madden-Julian事件的可预测性在长达五个月的时间范围内。

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