Mesoscale Studies of Convection and Tornadogenesis

对流和龙卷风发生的中尺度研究

• 批准号: 9422499
• 负责人: Roger Wakimoto
• 金额: $ 48.16万
• 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: 1995
• 资助国家: 美国
• 起止时间: 1995-05-01 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9422499&HistoricalAwards=false
• 关键词: Mesoscale; Studies; Convection; Tornadogenesis

9422499 Wakimoto Physical forcing that occurs on small spatial and time scales (mesoscale) often determines the timing, location and severity of various weather phenomena. The Principal Investigator proposes to apply principals of mesoscale analysis to a variety of weather phenomena including tornadogenesis, study of convection in the boundary layer along what is termed horizontal convective roles, and to the study of oceanic cyclogenesis. The tornadogenesis study is focused on determining the physical factors that cause some severe thunderstorms to produce tornadoes while others do not. The Principal Investigator will participate in the second phase of the Verification of Origins of Tornadoes Experiment (VORTEX) as well as continue analysis of data collected during the first phase in the Spring of 1994. A unique aspect of this investigation is the first use of airborne Doppler data for the study of tornadogenesis. The study of horizontal convective roles is a continuation of analysis of data collected during the Convection and Precipitation/Electrification. This study is focused on one of the most common types of boundary layer convection and will include a study of how horizontal convective roles interact with the sea breeze. The third component will investigate the fine scale details of oceanic cyclogenesis using data from the Experiment on Rapidly Intensifying Cyclones over the Atlantic. Preliminary radar syntheses have revealed shallow mesoscale circulations that form along an intense warm front. This mesoscale feature appears to be the incipient circulation that can lead to rapid cyclogenesis when it comes into a proper phasing with an upper-level short wave trough. ***

小行星9422499 在小的空间和时间尺度（中尺度）上发生的物理强迫往往决定各种天气现象的时间、位置和严重程度。 首席研究员建议将中尺度分析的原理应用于各种天气现象，包括龙卷风的形成，沿着所谓的水平对流作用的边界层对流的研究，以及海洋气旋的研究。 龙卷风形成研究的重点是确定物理因素， 导致一些严重的雷暴产生龙卷风，而另一些则不会。 首席调查员将参加旋风起源核查实验的第二阶段，并继续分析1994年春季第一阶段收集的数据。 这次调查的一个独特之处是首次使用机载多普勒数据研究龙卷风的形成。 水平对流作用的研究是资料分析的继续 在对流和沉淀/带电过程中收集。 这项研究的重点是边界层对流的最常见的类型之一，并将包括水平对流作用如何与海风相互作用的研究。 第三个组成部分将利用大西洋上空快速增强气旋实验的数据调查海洋气旋生成的细尺度细节。 初步的雷达合成显示，沿着沿着强烈的暖锋形成了浅的中尺度环流。 这种中尺度特征似乎是初期环流，当它与上层短波槽进入适当的相位时，可以导致快速的气旋生成。 ***