Dynamics and Transport in the Tropospheric Equatorial Westerly Ducts

对流层赤道西风管的动力学和传输

• 批准号: 0094971
• 负责人: Darryn Waugh
• 金额: $ 26.71万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0094971&HistoricalAwards=false
• 关键词: Dynamics; Transport; Tropospheric; Equatorial; Westerly

The project will investigate the dynamical interactions and tracer transports between the tropics and midlatitudes, especially during Northern winter. The equatorial upper troposphere is occupied by a belt of easterlies during much of the year, except winter, when westerly winds are present over the central/eastern oceans. The easterlies are an effective barrier for equatorward propagating stationary Rossby waves, and the wintertime "westerly duct" thus presents an opening that allows vigorous tropical-extratropical interaction. Dr. Waugh will conduct a dynamically oriented analysis of meteorological fields and water vapor observations to understand how tropical-extratropical interactions through this conduit impact tropical convection, and the upper tropospheric distribution of water vapor (a major component in global warming), ozone, and trace gases. These trace substances exert a profound control on the earth's climate, directly through radiative impacts, and indirectly, through the altered balanced circulation. Dr. Waugh will use a range of dynamical and transport models to provide context for his observational findings.

该项目将调查热带和中纬度地区之间的动力相互作用和示踪剂输送，特别是在北方冬季。赤道对流层上层在一年中的大部分时间里都被一条东风带占据，除了冬季，当时西风出现在中部/东部海洋。东风是一个有效的障碍，向赤道传播的固定Rossby波，冬季的“西风管道”，从而提出了一个开放，使有力的热带-热带外相互作用。Waugh博士将对气象场和水汽观测进行动态分析，以了解通过该管道的热带-外热带相互作用如何影响热带对流，以及水汽（全球变暖的主要组成部分），臭氧和痕量气体的对流层上层分布。这些微量物质直接通过辐射影响，间接通过改变平衡循环，对地球气候产生深远的控制。沃博士将使用一系列动力学和运输模型来为他的观察结果提供背景。