Continued Investigation of the Extraordinary Katabatic Windsat Terra Nova

继续调查非凡的下降风卫星 Terra Nova

• 批准号: 8916998
• 负责人: Thomas Parish
• 金额: $ 11.71万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916998&HistoricalAwards=false
• 关键词: Continued; Investigation; Extraordinary; Katabatic; Windsat

This project is a continuation of a successful investigation into the antarctic surface and boundary layer wind field, with specific emphasis on the extremely strong down-slope katabatic winds in the vicinity of Terra Nova Bay. The outward flowing surface air is an integral part of the meridional circulation, together with inflow and convergence aloft, and generally sinking motion over the continent. The pattern of katabatic winds over the sloping ice sheet is highly irregular, with air converging into several narrow coastal regions to produce locally what are recognized as the strongest and most persistent surface winds in the world. Known examples are at Cape Denison and Port Martin in Adelie Land (facing Australia), and in Terra Nova Bay on the western coast of the Ross Sea. Specific tasks to be undertaken as part of this project are to complete the kinematic, dynamic, and climatological analysis of specific katabatic events, to integrate high resolution satellite imagery into specific case studies, and to carry out extensive numerical modeling at various spatial scales. An existing array of automatic weather stations has provided the primary data set for this study; it is being extended by the satellite imagery which will be used to investigate the offshore propagation of the katabatic air stream. The modeling effort is being extended to continent-wide simulations using a grid spacing of 40 kilometers in order to explore the climatic impacts of the coastal confluence zone dynamics.

该项目是对南极表面和边界层风场的成功调查的继续，重点是Terra Nova湾附近极强的下坡热风。向外流动的地面空气是经向环流的组成部分，与流入和高空汇合一起，通常在大陆上空下沉运动。倾斜冰盖上的卡特式风的模式非常不规则，空气汇聚到几个狭窄的沿海地区，在当地产生了被认为是世界上最强、最持久的地面风。已知的例子是阿德利岛(面向澳大利亚)的丹尼森角和马丁港，以及罗斯海西海岸的Terra Nova Bay。作为这一项目的一部分，将开展的具体任务是完成对特定降温事件的运动学、动力学和气候学分析，将高分辨率卫星图像纳入具体案例研究，并在各种空间尺度上进行广泛的数值模拟。现有的一系列自动气象站为这项研究提供了主要数据集；卫星图像正在扩展，这些图像将用于调查卡塔巴特气流的近海传播。模拟工作正在扩展到全大陆范围的模拟，使用40公里的网格间距，以探索沿海汇流带动态的气候影响。