Model-Aided Studies of Mesoscale Phenomena within Cyclonic Weather Systems

9419455长期以来，人们一直认为，当地天气事件的确切时间、地点和严重程度是由气象学家所说的中尺度过程决定的。首席调查员的主要目标是对中尺度天气系统进行数值模拟，以确定三种不同中尺度现象的关键物理过程。这三种现象分别是极地低压(在极地海域形成的小涡旋，在强烈情况下对船舶作业构成危险)、中尺度对流系统和锋面。在极地低压工作中，将比以往更广泛地研究天气形势和地理背景，目的是了解极地低压形成的不同组成部分在不同情况下如何相互作用。中尺度对流的研究将集中在模式分辨率和模式表示如何影响中尺度对流系统的发展，特别是在海洋风暴的早期阶段。锋面的工作将主要涉及诊断海洋气旋的锋面是如何形成的，这种气旋不是在先前存在的锋面上形成的，但随着它的演变会产生自己的锋面。研究将主要通过与国家大气研究中心的科学家一起进行的数值模拟研究来完成。***

9419455 Reed It has long been recognized that the exact timing, location and severity of local weather events are determined by what is termed by meteorologist as mesoscale processes. The Principal Investigator's main objective is to carry out numerical simulations of mesoscale weather systems in order to identify key physical processes of three distinct mesoscale phenomena. These three phenomena are polar lows (small vortices that form over polar seas and in intense cases present a hazard to ship operations), mesoscale convective systems, and fronts. In the polar low work, a wider range of synoptic situations and geographic setting will be studied than heretofore with the aim of understanding how different components of polar low formation interact under different circumstances. The research on mesoscale convection will focus on how model resolution and model representation of unresolved convection affect the development of mesoscale convective systems, particularly in the early stages of oceanic storms. The frontal work will be concerned mainly with diagnosing how fronts form in the type of oceanic cyclone that does not form on a preexisting front , but that creates its own fronts as it evolves. Research will be primarily accomplished through numerical modeling studies conducted in conjunction with scientists from the National Center for Atmospheric Research. ***