Instability of Frontal Waves and Upper Level Frontogenesis

锋波和上层锋生的不稳定性

• 批准号: 9114850
• 负责人: Carlos Mechoso
• 金额: $ 25.63万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-02-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114850&HistoricalAwards=false
• 关键词: Instability; Frontal; Waves; Upper; Level

Drs. Mechoso and Arakawa will continue their two primary research thrusts on fronts. First, they are investigating processes which lead to frontal formation and the generation of unstable secondary waves on fronts, particularly in the middle and upper troposphere. Second, they are developing new numerical methods suitable for the study of frontal phenomena. Previous work by the investigators now leads to the specific consideration of several topics: (1) the comparative advantages and disadvantages of models which use relative pressure (.) as the vertical coordinate and those which use potential temperature (>); (2) the origin and evolution of small-scale disturbances on fronts; (3) the role of diabatic processes in frontogenesis; and (4) the development of primitive-equation models with a vertical coordinate that gradually changes from . at the surface to > at upper levels. Under their previous grant, the principal investigators made considerable progress in their work on the development of large scale models capable of resolving frontogenetic processes. They have also succeeded in addressing some of the fundamental questions about these processes. Their research ultimately will contribute to the improvement of operational weather forecast models.

博士。 Mechoso 和 Arakawa 将继续他们在前沿领域的两个主要研究方向。 首先，他们正在研究导致锋面形成和锋面不稳定次级波产生的过程，特别是在对流层中层和上层。 其次，他们正在开发适合研究锋面现象的新数值方法。 研究人员之前的工作现在导致对几个主题的具体考虑：（1）使用相对压力（.）作为垂直坐标的模型与使用位温（>）的模型的优缺点比较； (2)锋面小规模扰动的起源和演化； (3)非绝热过程在锋生中的作用； (4) 发展了垂直坐标从 逐渐变化的本原方程模型。从表面到 > 上层。 在之前的资助下，主要研究人员在开发能够解决锋生过程的大型模型方面取得了相当大的进展。 他们还成功地解决了有关这些过程的一些基本问题。 他们的研究最终将有助于改进业务天气预报模型。