Studies of the Requirements for the Numerical Simulations ofMesoscale Rainbands Forced by Conditional Symmetric Instability

条件对称不稳定性驱动的中尺度雨带数值模拟要求研究

• 批准号: 8716204
• 负责人: Thomas Warner
• 金额: $ 19.87万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-11-15 至 1991-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8716204&HistoricalAwards=false
• 关键词: Studies; Requirements; Numerical; Simulations; ofMesoscale

Extratropical cyclones dominate the weather and precipitation in temperate latitudes. The precipitation pattern is often organized in a banded structure. The horizontal scales of the frontal rainbands range from a few kilometers along the cold fronts to several tens of kilometers observed in both the warm and cold sectors of a frontal system. Several theories have been put forward to explain the organization of frontal rainbands; presently the conditional symmetric instability appears capable of explaining several types of rainbands. The most important next stage in the development of this subject is the implementation of conditional symmetric instability in numerical models. Using the mesoscale model of the Pennsylvania State University, Professors Warner and Clark will examine the model characteristics required of a realistic simulation of the rainband structures. The bulk of the rainfall received in temperate latitudes is associated with the passage of either warm or cold fronts. This work, when successfully completed, represents an important step forward in the numerical prediction of mesoscale precipitation.

温带纬度的天气和降水占主导地位。 降水模式通常是在带状结构中组织的。 额雨带的水平尺度范围从沿着冷锋几公里到在额叶系统的温暖和冷扇区中观察到的几十公里。 已经提出了一些理论来解释额叶雨带的组织。目前，有条件的对称不稳定性似乎可以解释几种类型的雨带。 该主题开发的最重要的下一阶段是在数值模型中实施条件对称不稳定性。 Warner和Clark教授将使用宾夕法尼亚州立大学的中尺度模型，研究雨带结构的现实模拟所需的模型特征。 温带纬度收到的大部分降雨与温暖或冷锋的通过有关。成功完成后，这项工作代表了中尺度降水的数值预测迈出的重要一步。