Investigations of the Mesoscale and Microscale Structure of Midwest Winter Cyclonic Storms

中西部冬季气旋风暴的中尺度和微观结构研究

• 批准号: 8816309
• 负责人: Robert Rauber
• 金额: $ 19.01万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-12-15 至 1991-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816309&HistoricalAwards=false
• 关键词: Investigations; Mesoscale; Microscale; Structure; Midwest

Due to the potential for disruption of human and economic activities, the precipitation characteristics of winter-time cyclones are of great practical as well as scientific interest. It has been know for some time that the heaviest precipitation from these systems occurs in relatively narrow precipitation bands. Over the past several years, the organization of precipitation bands in cyclonic storms has received a great deal of attention with a variety of physical mechanisms being proposed to explain the characteristics of these bands. Interestingly, most of these observational studies of bandedness in winter cyclonic storms have been conducted in coastal regions which experience quite different meteorological conditions than the mid-continental area. The principal Investigators propose a pilot observational and numerical modelling study in Illinois to begin to define the characteristics of mid-continent cyclonic precipitation bands. The observational component of this research will involve enhanced serial sounding of the atmosphere and two advanced instruments for meteorological research -- wind profiler and Doppler radar. A major focus is to relate the organization and structure of precipitation bands to flow fields and thermodynamic structure of larger scale phenomena such as fronts, lower and upper level jet streams, and zones of deformation flow.

由于可能破坏人类和经济 活动，冬季降水特征 气旋 具有很强的实用性和科学性。 已经 地知道 有时候这些系统的最强降水 发生在 相对狭窄的降水带。 在过去几年中， 降水带 在气旋风暴中受到了极大的关注， 各种 物理机制被提出来解释 特性 这些乐队。 有趣的是，大多数这些观察性研究 的 冬季气旋风暴的带状性已经在 沿海 气候条件截然不同的地区 条件比 大陆中部地区。 主要研究者提出了一个试点观察 和 伊利诺斯州的数值模拟研究开始定义 大陆中部气旋性降水带的特征。 的 这项研究的观察部分将涉及加强 串行 探测大气层和两个先进的仪器， 气象研究-风廓线仪和多普勒雷达。 一 主要 重点是将组织和结构 降水带 更大尺度的流场和热力学结构 现象 例如锋面、低层和高层急流，以及 变形流动