Mechanisms for Hurricane Motion and Intensity Change

GSTDTAP

项目编号	1724198
	Mechanisms for Hurricane Motion and Intensity Change
	Hugh Willoughby
主持机构	Florida International University
项目开始年	2017
	2017-09-15
项目结束日期	2020-08-31
资助机构	US-NSF
项目类别	Continuing grant
项目经费	209232(USD)
国家	美国
语种	英语
英文摘要	The factors that impact hurricane motion and intensity have been deeply studied over the past few decades, with resulting improvement in knowledge and forecasting ability. However, there are still basic questions about processes in the inner core of a hurricane and the role they may play in determining the strength and track of tropical systems. This project will focus on atmospheric waves that move around the center of a hurricane and potentially impact intensification and rain bands. The main societal impact of this work will be to improve understanding of a basic process in tropical cyclones with a goal of improving intensity and track forecasts. A student will be directly involved with the project, thus ensuring the transfer of knowledge to the next generation of scientists. The research team will conduct a theoretical and modeling study into the small-scale motions within a hurricane which may affect their direction and intensity change. The project is focused on Vortex Rossby Waves (VRWs) which can be excited by convection or tropical cyclone motion. These VRWs transport angular momentum inward and wave energy outward, and may underlie spiral rain band formation. The project will make use of two existing simple models of tropical cyclone dynamics, a linear model and a time-domain model. Four aspects of VRWs in tropical cyclones will be investigated: 1) Convectively forced wavenumber-1 VRWs and their interaction with vortex motion in a Barotropic Non-Divergent (BND) model, 2) Logical inconsistency of unbounded vortices on a spherical Earth, 3) Rectification of vorticity sources when wavenumber-n asymmetric convergence interacts with wavenumber-n vorticity to generate symmetric and wavenumber-2n vorticity, 4) Three-dimensional modeling of convectively forced waves in the inner waveguide
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/71982
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Hugh Willoughby.Mechanisms for Hurricane Motion and Intensity Change.2017.