Orographically Triggered Tropical Cyclones in the Eastern North Pacific

北太平洋东部地形引发的热带气旋

• 批准号: 9813806
• 负责人: Joseph Zehnder
• 金额: $ 13.91万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9813806&HistoricalAwards=false
• 关键词: Orographically; Triggered; Tropical; Cyclones; Eastern

Dr. Zehnder will continue to investigate the hypothesis that most cases of Eastern Pacific tropical cyclogenesis results from the interaction between easterly waves and the orography of Mexico and Central America. Under a previous award, he completed a case study of Hurricane Guillermo which suggests that orography played a strong role in the formation of the storm. The next phase of this research will involve analysis of ECMWF gridded data (composites), GOES data, and simulations with the MM5 model to further document the existence of orographically forced circulations and their role in tropical cyclogenesis. Using satellite data to identify areas of deep convection, Dr. Zehnder will construct composites of various fields for the prior 24-48 hour period from the ECMWF data sets. He will look for evidence of easterly waves and compare those cases where deep convective clusters developed into tropical cyclones and those when they did not. For the modeling component, he will carry out a number of idealized flow experiments to look at the roles of orography, easterly waves, and the North American monsoon trough.

Zehnder博士将继续研究东太平洋热带气旋生成的大多数情况是由东风波与墨西哥和中美洲地形之间的相互作用造成的假设。 在之前的奖项下，他完成了飓风吉列尔莫的案例研究，该研究表明地形在风暴的形成中发挥了重要作用。 这项研究的下一阶段将涉及分析ECMWF网格数据（复合数据），GOES数据和MM 5模式的模拟，以进一步记录地形强迫环流的存在及其在热带气旋生成中的作用。 Zehnder博士将利用卫星数据来确定深对流区域，并根据ECMWF数据集构建先前24-48小时内各种场的合成。 他将寻找东风波的证据，并比较深对流团发展成热带气旋和没有发展成热带气旋的情况。 对于建模部分，他将进行一些理想化的流动实验，看看地形，东风波和北美季风槽的作用。