Numerical Simulation of Convective Phenomena

首席调查员将利用现有的观测数据和最先进的中尺度数值模式来研究广泛的对流现象，如狂风线、强烈风暴、对流湍流、龙卷风和阵风锋面。其目的是促进对与这些事件有关的动力学和物理学的基本了解，最终目的是提供指导，帮助更准确地预测恶劣天气事件。具体目标包括：(1)确定长寿命龙卷风的动力学和伴生环境；(2)利用与非静力对流模式耦合的静力区域模式，研究观测到的广场线的对流行为；(3)了解边界层辐合/切变边界在非超单体龙卷风生成中的作用；(4)探索水平变率环境中模拟的中纬度锋线内单个对流的行为；(5)通过多尺度模拟，探索干、湿、降水条件下的湍流动力学；(6)进一步发展对流研究的模拟、分析和可视化。

The Principal Investigator will use existing observational data and a state of the art mesoscale numerical model to investigate a wide range of convective phenomena such as squall lines, severe storms, convective turbulence, tornadoes and gust fronts. The objective is to advance fundamental understanding of the dynamics and physics associated with these events with the ultimate goal of providing guidance which will assist in more accurate prediction of severe weather events. Specific objectives include: (1) determining the dynamics and accompanying environment of long-lived tornadoes; (2) investigating the convective behavior of an observed squall line through the use of a hydrostatic regional model coupled to a nonhydrostatic convection model; (3) understanding the role of boundary-layer convergence/shear boundaries in the generation of non-supercell tornadoes; (4) probing the behavior of individual convection within mid-latitude squall lines simulated in environments with horizontal variability; (5) exploring the dynamics of turbulence under dry, moist, and precipitating conditions through simulation of the multiple scales involved; and (6) further development of the modeling, analysis, and visualization for studying convection.