Organized mesoscale convection is important for many atmospheric phenomena and hazards, however the understanding of its governing mechanisms is incomplete. Theories explaining mesoscale organization rely on the interaction between convection outflows and lower‐tropospheric wind shear. Here a new mechanism is presented, where lower‐stratospheric wind shear is shown to influence mesoscale organization. The mechanism is linked to coupling between convection and gravity waves, with the stratosphere playing a role in shaping the tropospheric wave spectrum. The key result is that lower‐stratospheric shear creates a preference for organized systems propagating in the same direction as the shear vector by weakening the systems propagating in the opposite direction to the shear. This result has important implications for stratosphere‐troposphere interactions, numerical modeling, and understanding of convective organization in general.

中文翻译：

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平流层下层剪切作用是否影响中尺度对流组织？

有组织的中尺度对流对许多大气现象和危害很重要，但是对它的控制机制的理解还不完善。解释中尺度组织的理论依赖于对流流出与低层对流层风切变之间的相互作用。这里提出了一种新的机制，平流层下部的风切变被证明会影响中尺度的组织。该机制与对流波和重力波之间的耦合有关，平流层在对流层波谱的形成中起着作用。关键结果是，低平流层剪切力削弱了沿与剪切力方向相反的方向传播的系统，从而偏向于与剪切矢量相同方向传播的有组织系统。