The Role of Topography on Tropical Cyclogenesis in the Eastern North Pacific

地形对北太平洋东部热带气旋发生的作用

• 批准号: 9412751
• 负责人: Joseph Zehnder
• 金额: $ 28.3万
• 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: 1994
• 资助国家: 美国
• 起止时间: 1994-11-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9412751&HistoricalAwards=false
• 关键词: Role; Topography; Tropical; Cyclogenesis; Eastern

The eastern North Pacific, just west of the Sierra Madre Mountains, experiences a high incidence of tropical cyclone formation. The initial location of the storms and the prevailing low-level wind direction suggest that the terrain may play a role in the cyclogenesis. Observations also suggest that secondary circulations generated as mature tropical cyclones make landfall on the east coast of Mexico may contribute to cyclogenesis in the region as well. Previous theoretical studies indicate that the interaction of easterly zonal flows with the terrain may generate easterly waves which serve as the initial circulations that trigger tropical cyclone formation in the eastern Pacific. The principal investigator will conduct further studies, principally modeling studies, using a hierarchy of models to better diagnose the evolution of the circulation systems. ***

北太平洋东部，就在马德雷山脉以西，热带气旋形成的几率很高。风暴的初始位置和盛行的低空风向表明地形可能在气旋形成中起作用。观测还表明，成熟热带气旋在墨西哥东海岸登陆时产生的二次环流也可能有助于该地区的气旋形成。以往的理论研究表明，偏东纬向气流与地形的相互作用可能产生偏东波，这是触发东太平洋热带气旋形成的初始环流。首席研究员将进行进一步的研究，主要是建模研究，使用模型层次来更好地诊断循环系统的演变。＊＊＊