A modelling case‐study based on observations from the Dynamics of the Madden–Julian Oscillation field campaign is presented and discussed. It aims at investigating the ocean–atmosphere coupling and the marine atmospheric boundary‐layer structure over an oceanic diurnal warm layer. This case corresponds to the development of a diurnal warm layer characterized by a sea surface temperature diurnal cycle of ∼2°C. A 1D oceanic model with high vertical resolution is used to investigate the mechanisms responsible for the establishment and decay of the diurnal warm layer highlighting competing impact of the absorption of the solar radiation, the turbulent transport and the surface heat loss. An atmospheric large‐eddy simulation coupled to the 1D oceanic model is then presented and extensively evaluated against the numerous observations available for this case. The simulation is able to reproduce the surface fluxes and the main boundary‐layer structures. This study thus provides a case to investigate the ability of parametrizations to handle the ocean–atmosphere coupling and its impact on the atmospheric boundary layer.

中文翻译：

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海洋与大气对海洋日温暖层响应的案例研究

提出并讨论了基于Madden-Julian振荡现场运动动力学观察结果的建模案例研究。它旨在研究海洋日暖层上的海气耦合和海洋大气边界层结构。这种情况对应于昼间暖层的发展，其特征是海表温度昼间周期为〜2℃。使用具有高垂直分辨率的一维海洋模型来研究造成日暖层形成和衰减的机理，从而突出了太阳辐射吸收，湍流传输和表面热量损失的竞争影响。然后介绍了与一维海洋模型耦合的大气大涡模拟，并针对该案例的大量观测值进行了广泛的评估。该模拟能够重现表面通量和主要边界层结构。因此，本研究为研究参数化处理海气耦合及其对大气边界层的影响提供了一个案例。