Impact of inertia-gravity waves (IGW) generated in the upper troposphere on precipitation events and the interaction of both phenomena

副热带湿空气和暖气团通过北大西洋传播到欧洲地区，形成了降水密集的格罗伯湿润地带。降水的范围、强度、时间和持续时间主要由行星尺度、天气尺度和次天气尺度的非线性动力学决定。这些复杂过程对降水事件的影响尚不清楚，将在本项目中进行研究。焦点集中在行星极地Rossby波破裂事件上，因为在这种斜压生命周期中，中尺度低频重力波，即所谓的惯性重力波，在急流条纹下游产生。这些波可能从对流层上层向下传播到边界层。在可能不稳定的情况下，这些惯性重力波可能会引起上升气流和随后的深对流，从而导致强降水事件。对于选定的六种情况，应进行高分辨率模式模拟，以开展具有显式对流的过程研究。模型结果将与观测结果进行验证，并将检查可预测性问题。

The propagation of subtropical wet and warm air masses over the North Atlantic into the European region defines a Großwetterlage with intensive precipitation. The areas of precipitation, their intensity, time and duration are mainly determined by the nonlinear dynamics at planetary, synoptic and sub-synoptic (meso-) scales. The impact of these complex processes on precipitation events is not understood yet and will be studied in this project. The focus is on planetary poleward Rossby waves breaking events, because in this type of baroclinic lifecycles mesoscale low-frequency gravity waves, so-called inertia-gravity waves, are generated downstream of the jet streak. These waves may propagate from the upper troposphere down to the boundary layer. In potentially unstable situations these inertia-gravity waves may induce updrafts and subsequent deep convection leading to heavy precipitation events. For six selected cases high resolution model simulations should be performed to carry out process studies with explicit convection. The model results will be validated with observations and the problem of predictability will be examined.