Water Mass Transformation and Downwelling around Islands

GSTDTAP

项目编号	1534618
	Water Mass Transformation and Downwelling around Islands
	Michael Spall
主持机构	Woods Hole Oceanographic Institution
项目开始年	2015
	2015-10-01
项目结束日期	2019-09-30
资助机构	US-NSF
项目类别	Standard Grant
项目经费	542970(USD)
国家	美国
语种	英语
英文摘要	Islands are dynamically interesting because they pose strong dynamical constraints on the exchange between the island shelf and the open ocean, and can result in important water mass transformation and export. These dynamics also influence the circulation on the shelf, on the slope, and far from the island. Idealized and realistic numerical ocean models will be combined with simple analytic models to better understand what controls water mass transformation and net downwelling around islands. The idealized framework emphasized here will provide a clearer understanding of why these processes differ between different islands and how they might be expected to change in a changing climate. Work supported by this grant will contribute to both undergraduate and graduate education programs at the Woods Hole Oceanographic Institution. The combination of analytic models and eddy resolving numerical models will provide insights into the dynamics and thermodynamics that control the diapycnal mass flux and mixing on island shelves and export of product waters to the surrounding ocean. Particular focus will be given to asymmetrical forcing situations in which the buoyancy-forcing, wind stress, surrounding ocean, or bottom topography vary around the island perimeter. The general approach will use theory to identify the relevant non-dimensional numbers and provide a dynamical framework with which to guide and interpret the numerical model calculations. The numerical models will be used to test the basic predictions from the theory while more completely resolving important processes such as nonlinear eddy fluxes and convection. Quantities of interest include: properties of product water masses; distribution of upwelling and downwelling; net diapycnal mass flux; induced circulations and fluxes across the shelf break.
来源学科分类	Geosciences - Ocean Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/68906
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Michael Spall.Water Mass Transformation and Downwelling around Islands.2015.