Frontogenesis and Boundary Layer Physics

9424462本研究项目包括研究边界层过程在表面锋面的形成、结构和传播中的作用。锋面的低空结构包括涡度场、辐合场和锋面上升气流。它们的相对位置有助于确定锋生的速度和锋面的强度和速度。首席调查员将在研究中使用各种工具。斜压边界层的诊断地转动量模式将被用来研究斜压性、瞬变、平流和层结的影响。预报模式将被用来进行数值试验，旨在阐明表面摩擦和表面剪切通量在锋面上的作用。最后，对风暴尺度业务和研究气象-锋面实验系统试验(STORM-FEST)现场计划的数据进行分析，以记录观测到的中、微尺度锋面结构，并将其与模式结果进行比较。了解影响大气锋面行为的过程是改进天气预报的一个重要方面。***

9424462 Bannon This research project involves an investigation of the role of boundary layer processes in the formation, structure and propagation of surface fronts. The low level structure of the front includes the vorticity and convergence fields as well as the frontal updraft. Their relative positions help to determine the rate of frontogenesis and the strength and speed of the front. The principal investigator will employ a variety of tools in the study. A diagnostic geostrophic momentum model of the baroclinic boundary layer will be used to study the effects of baroclinicity, transience, advection, and stratification. A prognostic model will be used to conduct numerical experiments designed to elucidate the roles of surface friction and surface hear fluxes on the front. Finally, analyses of data from the Storm-scale Operational and Research Meteorology-Fronts Experiment Systems Test (STORM-FEST) field program to document observed mesoscale and microscale frontal structure and compare it with model results. Understanding the processes affecting the behavior of atmospheric fronts is an important aspect of efforts to improve weather forecasting. ***