Mechanisms of Intensity Change in Sheared Tropical Cyclones

热带气旋切变强度变化机制

• 批准号: 1453311
• 负责人: John Molinari
• 金额: $ 46.7万
• 依托单位: SUNY at Albany
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-03-15 至 2019-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1453311&HistoricalAwards=false
• 关键词: Mechanisms; Intensity; Change; Sheared; Tropical

The project will use NOAA/HRD-derived aircraft data, including dual-Doppler winds and reflectivity, plus numerous additional sources of data, to evaluate existing theories of vertical wind shear effects on tropical cyclones. The focus will be on the "low-level pathway" in which low equivalent potential temperature air produced by downdrafts into the boundary layer reaches the eyewall and reduces storm intensity. Case studies will be conducted for varying intensity changes in the presence of moderate to large vertical wind shear. The goal is to understand every aspect of the low-level pathway, including the roles of cold downdrafts, boundary layer recovery, and stratiform and convective precipitation.Intellectual Merit: The questions that are addressed here are fundamental to predicting tropical cyclone intensity change. The understanding of key processes in tropical cyclone intensity change constitutes a direly needed scientific endeavor, which would lead to improvement of hurricane forecasting.Broader Impacts: These include the education of graduate students and the use of an outstanding database collected by HRD/NOAA. These valuable taxpayer-funded data have not been fully utilized. The graduate student education includes guidance with the writing of theses and papers and development of presentation skills. Additional educational experience for graduate students and postdocs is produced by co-sponsoring the Northeast Tropical Conference every two years. Work is disseminated through articles in top professional journals and via numerous presentations.

该项目将使用NOAA/HRD获得的飞机数据，包括双多普勒风和反射率，以及许多其他数据来源，以评估垂直风切变对热带气旋影响的现有理论。 重点将放在“低层路径”上，在该路径上，由进入边界层的下沉气流产生的低当量位温空气到达眼墙，降低风暴强度。 将对存在中到大垂直风切变的情况下不同强度变化进行案例研究。 目标是了解低层路径的各个方面，包括冷下沉气流，边界层恢复，层状和对流降水的作用。智力优点：这里解决的问题是预测热带气旋强度变化的基础。 了解热带气旋强度变化的关键过程是一项迫切需要的科学奋进，这将导致飓风预报的改进。更广泛的影响：其中包括研究生的教育和使用人力资源开发/海洋大气署收集的优秀数据库。这些纳税人资助的宝贵数据没有得到充分利用。 研究生教育包括指导论文和论文的写作以及演讲技巧的发展。研究生和博士后的额外教育经验是通过共同赞助每两年一次的东北热带会议产生的。 工作通过顶级专业期刊上的文章和许多演讲传播。