Collaborative Research: Study of the Genesis, Evolution, Structure, and Dynamic Climatology of Tornadoes and Their Environments

合作研究：龙卷风及其环境的起源、演化、结构和动态气候学研究

• 批准号: 0437512
• 负责人: Yvette Richardson
• 金额: $ 51万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-01 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0437512&HistoricalAwards=false
• 关键词: Collaborative; Research; Study; Genesis; Evolution

Current level of understanding in several areas of tornado science fails to provide answers to some fundamental questions. Basic answers concerning the true distribution of sizes, intensities, or structures of tornadoes are elusive. The influence of the local environment on tornado intensity, the determining factors for the occurrence and timing of genesis, growth, intensification, and dissipation, as well as the modes of genesis are largely unknown, as are details concerning vertical wind field structure, the evolution and structure of damaging winds near the ground, and sub-tornado-scale vortices. Many of these questions are not new; however, due to the current availability of high quality, high-resolution data sets, it is possible to address these questions in a more rigorous manner. The Doppler On Wheels (DOW) mobile radars have collected detailed data sets of several tornadoes in recent years. These data sets represent a treasure trove of unique and valuable information, the analysis of which can be applied to advance understanding of a broad range of fundamental processes related to tornadoes. Data collected using the DOWs during 1995-2003 in the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX) and the Radar Observations of Tornadoes and Thunderstorms Experiment (ROTATE) will be analyzed, some in conjunction with other radar and in situ observations, to study the genesis, evolution, structure, and climatology of tornadoes and their environments. The VORTEX and ROTATE field campaigns yielded data with unprecedented quality. Through careful radar deployments at ranges of 0.17-15 km from tornado centers, data were obtained at very fine resolution, with cross and along beam data spacing of from 3 - 250 m and 12-75 m, respectively. These observations were obtained during various stages of tornado evolution for 60 tornadoes, providing a broad sample for statistical and climatological analysis. Fast scanning capabilities and carefully selected volume coverage patterns over the depth of interest allowed for temporal resolutions from 13 s in two dimensions, 20 s in limited three dimensional, to 50 s in deep three dimensional volumes. Using carefully designed scanning strategies, deployments capturing tornadogenesis were achieved in several instances, including one with dual-Doppler, in addition to several dual-Doppler deployments on pre-existing tornadoes. Different data sets will be used to explore specific aspects of the phenomena. Detailed dual-Doppler and single-Doppler analyses will be conducted on particular cases in order to evaluate conceptual, numerical, and laboratory models of tornado structure, evolution, and genesis. An analysis of the broad range of tornado data sets will be undertaken in order to develop a climatology of basic tornado structures and dynamics. Single-Doppler retrievals will be conducted on high-resolution volumetric data sets in large tornadoes. DOW radar and other data will be used to study the evolution and structure of tornadoes in varying environments, and their effect on those environments. A greater understanding of tornadogenesis, structure, environmental dependencies, climatology, and other issues described above will have a broad impact on the ability to detect, warn, and forecast these severe events and reduce subsequent casualties.

目前对龙卷风科学的几个领域的理解水平未能为一些基本问题提供答案。 关于龙卷风的大小、强度或结构的真实分布的基本答案是难以捉摸的。 当地环境对龙卷风强度的影响，发生和发生时间的决定因素，增长，加强和消散，以及发生的模式在很大程度上是未知的，因为有关垂直风场结构的细节，地面附近破坏性风的演变和结构，以及亚龙卷风尺度的漩涡。其中许多问题并不是新问题;但是，由于目前有高质量、高分辨率的数据集，有可能以更严格的方式解决这些问题。 近年来，轮式多普勒（DOW）移动的雷达收集了几次龙卷风的详细数据集。 这些数据集代表了一个独特而有价值的信息宝库，对这些信息的分析可用于促进对与龙卷风有关的广泛基本过程的理解。将分析1995-2003年期间在验证龙卷风旋转起源实验（VORTEX）和龙卷风和雷暴实验（ROTATE）的雷达观测中使用道斯收集的数据，其中一些与其他雷达和现场观测相结合，以研究龙卷风及其环境的成因，演变，结构和气候学。 VORTEX和ROTATE实地活动产生了前所未有的高质量数据。 通过在距龙卷风中心0.17-15公里范围内仔细部署雷达，获得了分辨率非常高的数据，交叉和沿着波束数据间隔分别为3 - 250米和12-75米。 这些观测数据是在60个龙卷风演变的不同阶段获得的，为统计和气候分析提供了广泛的样本。 在感兴趣的深度上的快速扫描能力和仔细选择的体积覆盖模式允许从二维中的13秒、有限三维中的20秒到深度三维体积中的50秒的时间分辨率。 使用精心设计的扫描策略，在几个实例中实现了捕获龙卷风发生的部署，包括一个双多普勒部署，以及在预先存在的龙卷风上的几个双多普勒部署。 将使用不同的数据集来探讨这一现象的具体方面。 详细的双多普勒和单多普勒分析将进行特定的情况下，以评估概念，数值和实验室模型的龙卷风结构，演变和成因。 将对广泛的龙卷风数据集进行分析，以发展基本龙卷风结构和动态的气候学。 将对大型龙卷风的高分辨率体积数据集进行单多普勒反演。 DOW雷达和其他数据将用于研究龙卷风在不同环境中的演变和结构，以及它们对这些环境的影响。更好地了解龙卷风的形成、结构、环境依赖性、气候学和上述其他问题，将对探测、预警和预报这些严重事件并减少后续伤亡的能力产生广泛影响。