Aspects of Tropical Meteorology: West Africa and North America

热带气象学方面：西非和北美

• 批准号: 0136220
• 负责人: Tsing-Chang Chen
• 金额: $ 8.83万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-15 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0136220&HistoricalAwards=false
• 关键词: Aspects; Tropical; Meteorology; West; Africa

The project will investigate the formation and maintenance of a key component of the tropical circulation that affects summer rainfall over continental United States: tropical storms, or hurricanes, in the Atlantic. The genesis of Atlantic hurricanes, which often make landfall over continental US, is in the African easterly waves, and the project will advance understanding of the dynamical factors controlling African easterly wave activity. The waves themselves are posited to arise from hydrodynamic instability of the African easterly jet, and Dr. Chen's research will examine the formation, maintenance, and variability of this lower tropospheric jet using the modern reanalysis data sets, which provide a wealth of information on circulation and diabatic heating. The diagnostic research will provide a new assessment of the dynamic and thermodynamic interactions involved in the formation and development of African easterly waves, building on the pioneering analyses of Carlson, Burpee, and Reed that date back a quarter century.

该项目将调查影响美国大陆夏季降雨的热带环流的一个关键组成部分的形成和维持：大西洋的热带风暴或飓风。经常在美国大陆登陆的大西洋飓风的起源是非洲东风波，该项目将促进对控制非洲东风波活动的动力因素的理解。波本身被认为是由非洲东风急流的流体动力学不稳定性引起的，陈博士的研究将使用现代再分析数据集来研究这种低对流层急流的形成、维持和变化，这些数据集提供了大量关于环流和非绝热加热的信息。诊断研究将提供一个新的评估的动力学和热力学的相互作用，在非洲东风波的形成和发展，卡尔森，Burpee和里德的开创性分析的基础上，可追溯到四分之一世纪。