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

对流层上层产生的惯性重力波（IGW）对降水事件的影响以及两种现象的相互作用

• 批准号: 5443775
• 负责人: Privatdozent Dr. Dieter H.W. Peters
• 金额: --
• 依托单位: Abteilung Modellierung atmosphärischer Prozesse
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5443775?language=en
• 关键词: Impact; inertia; gravity; waves; IGW

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.

北大西洋上的亚热带湿热空气团传播到欧洲地区，形成了一个降水量很大的大湿区。降水的落区、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。这些复杂的过程对降水事件的影响还不清楚，将在本项目中进行研究。重点是行星极向Rossby波破碎事件，因为在这种类型的斜压生命周期中，中尺度低频重力波，所谓的惯性重力波，产生下游的急流条纹。这些波可以从对流层上部向下传播到边界层。在潜在的不稳定情况下，这些惯性重力波可能会引起上升气流和随后的深对流，导致强降水事件。对于六种选定的情况，应进行高分辨率模型模拟，以进行显式对流的过程研究。将用观测结果验证模型结果，并将审查可预测性问题。