AbstractLarge freshwater fluxes into the Bay of Bengal by rainfall and river discharges result in strong salini'/> Submesoscale features and their interaction with fronts and internal tides in a high-resolution coupled atmosphere-ocean-wave model of the Bay of Bengal
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Submesoscale features and their interaction with fronts and internal tides in a high-resolution coupled atmosphere-ocean-wave model of the Bay of Bengal

机译：孟加拉湾高分辨率海气耦合海浪模型中的亚中尺度特征及其与海潮和内潮的相互作用

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AbstractLarge freshwater fluxes into the Bay of Bengal by rainfall and river discharges result in strong salinity fronts in the bay. In this study, a high-resolution coupled atmosphere-ocean-wave model with comprehensive physics is used to model the weather, ocean circulation, and wave field in the Bay of Bengal. Our objective is to explore the submesoscale activity that occurs in a realistic coupled model that resolves mesoscales and allows part of the submesoscale field. Horizontal resolution in the atmosphere varies from 2 to 6 km and is 13 km for surface waves, while the ocean model is submesoscale permitting with resolutions as high as 1.5 km and a vertical resolution of 0.5 m in the upper 10 m. In this paper, three different cases of oceanic submesoscale features are discussed. In the first case, heavy rainfall and intense downdrafts produced by atmospheric convection are found to force submesoscale currents, temperature, and salinity anomalies in the oceanic mixed layer and impact the mesoscale flow. In a second case, strong solitary-like waves are generated by semidiurnal tides in the Andaman Sea and interact with mesoscale flows and fronts and affect submesoscale features generated along fronts. A third source of submesoscale variability is found further north in the Bay of Bengal where river outflows help maintain strong salinity gradients throughout the year. For that case, a comparison with satellite observations of sea surface height anomalies, sea surface temperature, and chlorophyll shows that the model captures the observed mesoscale eddy features of the flow field, but in addition, submesoscale upwelling and downwelling patterns associated with ageostrophic secondary circulations along density fronts are also captured by the model.
机译： Abstract 由于降雨和河水流入孟加拉湾的大量淡水通量很大海湾的盐度前沿。在这项研究中，使用具有综合物理特性的高分辨率大气海浪模型来对孟加拉湾的天气，海洋环流和波场进行建模。我们的目标是探索在解决中尺度并允许部分亚尺度范围的现实耦合模型中发生的亚尺度范围的活动。大气中的水平分辨率从2到6 km不等，对于表面波为13 km，而海洋模型是亚中尺度的，分辨率高达1.5 km，垂直分辨率在10 m处为0.5 m。本文讨论了三种不同的海洋亚中尺度特征。在第一种情况下，大气对流产生的强降雨和强烈的向下气流被发现迫使海洋混合层的亚中尺度水流，温度和盐度异常并影响中尺度水流。在第二种情况下，安达曼海中的半日潮产生强烈的类孤波，并与中尺度水流和锋面相互作用，并影响沿锋产生的亚中尺度特征。在孟加拉湾以北的北部，发现了亚中尺度变化的第三个来源，那里的河水全年帮助维持了很强的盐度梯度。对于这种情况，与卫星观测到的海面高度异常，海面温度和叶绿素的比较表明，该模型捕获了观测到的流场的中尺度涡旋特征，但此外，与中古营养次级循环相关的亚中尺度上升和下降趋势模型还捕获了沿密度前沿的情况。

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