A Study of the Extension of the North Atlantic Current and Pathways of Exchange: Phase II - Data Analysis

北大西洋洋流延伸和交换路径的研究：第二阶段 - 数据分析

• 批准号: 9906775
• 负责人: H. Thomas Rossby
• 金额: $ 42.4万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-11-01 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9906775&HistoricalAwards=false
• 关键词: Study; Extension; North; Atlantic; Current

9906775RossbyRaw data obtained from RAFOS floats, deployed as part of the Atlantic Circulation and Climate Experiment, will be processed, quality controlled, and then analyzed. The processed data will be used: (a) to map out the paths taken by the waters of the North Atlantic Current after it passes the Grand Banks, (b) to identify the locations of, and processes responsible for, exchange across the North Atlantic Current, (c) to map out the dissolved oxygen field on the density surface followed by the floats, and (d) to obtain statistics of particle displacements in the region. In addition, a short cruise will be made to recover the submerged sound sources used by the floats for navigation. The scientific tasks are designed to illuminate the way in which the waters of the subpolar and subtropical North Atlantic are exchanged and will contribute to developing an understanding of the meridional transport of heat in that ocean. 9908091Padman/EgbertIn this work, sub-surface current meter data will be assimilated into two and three-dimensional numerical models of tidal flows in the Weddell Sea. Inverse methods will be used to guide improvements of parameterizations of the effects of diurnal vorticity waves and of friction in the bottom boundary layer. Since the Weddell Sea is close to the critical latitudes for the main semi-diurnal tide and has weak stratification, the bottom boundary layer is thick and the tidal flow is relatively barotropic, simplifying the modeling task and allowing a better characterization of the flow by the current meters.

9906775 RossbyRaw从RAFOS浮标获得的数据，作为大西洋环流和气候实验的一部分部署，将被处理，质量控制，然后分析。 处理后的数据将用于：（a）绘制北大西洋洋流的沃茨经过大浅滩后的路径图，（B）确定北大西洋洋流交换的位置和过程，（c）绘制浮标所处密度表面上的溶解氧场图，（d）获得该区域颗粒位移的统计数据。 此外，亦会进行一次短时间的航行，以回收浮体航行时所使用的水下声源。 这些科学任务旨在阐明北大西洋亚极地和亚热带沃茨交换的方式，并将有助于加深对该海洋热量经向输送的了解。 9908091 Padman/Egbert在这项工作中，次表层流速计数据将被同化到威德尔海的潮汐流的二维和三维数值模型中。 逆方法将被用来指导改进的参数化的影响，周日涡度波和摩擦的底部边界层。 由于威德尔海接近主要半日潮的临界纬度，分层较弱，底部边界层较厚，潮汐流相对正压，简化了建模任务，并允许通过流速计更好地表征水流。