Collaborative Research: Gulf Stream Re-Analysis - Structure, Transport and Dynamics

合作研究：湾流重新分析 - 结构、传输和动力学

• 批准号: 0352229
• 负责人: Douglas Luther
• 金额: --
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-03-01 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0352229&HistoricalAwards=false
• 关键词: Collaborative; Research; Gulf; Stream; Re

ABSTRACTOCE-0352229As the strongest element of the wind-driven circulation in the North Atlantic, the Gulf Stream has been a focus of extensive empirical studies, theoretical debate and modeling simulations. Its characteristics have always been prominent metrics by which the verisimilitude of numerical models has been judged. Despite this attention, there are important characteristics of the Gulf Stream between Cape Hatteras and the Grand Banks that remain poorly known. As a cost-effective means of acquiring more information and insight, the PI's will analyze existing data from the Gulf Stream that either have not been analyzed before or can be analyzed more accurately and completely now. The data in question were collected during the two-year (1988-1990) Synoptic Ocean Prediction (SYNOP) experiment, the most comprehensive experiment ever conducted in the Gulf Stream. While the original SYNOP investigators have completed outstanding studies of the Gulf Stream's kinematics and dynamics with the SYNOP data, there is still a wealth of information locked within that data, because only in the past four years have analysis techniques been developed which can take full advantage of the numerous Inverted Echo Sounder (IES) recorders) or process the moored current and temperature data without the biases arising from inadequate corrections for mooring motion and inaccurate projection into "stream" coordinates. This methodology employs historical hydrographic data in the vicinity of an IES array to construct a temperature function (called the gravest empirical mode, or GEM) with the independent variables depth (actually pressure) and seafloor-to-sea surface acoustic travel time. It will allow independent estimates of GS structure and transport. When the IES-GEM shears are combined with either the HEF transports, or bottom pressure plus near-bottom current meter records, the IES-GEM shears are transformed into absolute velocity profiles. Comparison with earlier analyses will also allow an assessment of the performance of traditional, widely used, analysis techniques. In addition, some important data, from Horizontal Electric Field Recorders, will be analyzed for the first time for its information about the Gulf Stream's structure and variability .

墨西哥湾流作为北大西洋风驱动环流中最强的要素，一直是广泛的经验研究、理论争论和模型模拟的焦点。它的特点一直是突出的度量标准，数值模式的逼真性已判断。尽管如此，哈特拉斯角和大浅滩之间的墨西哥湾流的重要特征仍然鲜为人知。作为获取更多信息和洞察力的一种具有成本效益的手段，PI将分析来自墨西哥湾流的现有数据，这些数据以前没有分析过，或者现在可以更准确、更完整地分析。 这些数据是在为期两年（1988-1990年）的海洋天气预报试验期间收集的，这是在墨西哥湾流进行的最全面的试验。虽然最初的SYNOP调查人员已经用SYNOP数据完成了对墨西哥湾流运动学和动力学的出色研究，但这些数据中仍然锁定了大量信息，因为只有在过去的四年中才开发出可以充分利用众多倒置回声测深仪记录器的分析技术）或者处理系泊的水流和温度数据，而没有由于对系泊运动的不充分校正和对“水流”坐标的不准确投影而产生的偏差。这种方法采用历史水文数据在附近的IES阵列构建一个温度函数（称为最严重的经验模式，或GEM）的独立变量深度（实际上是压力）和海底到海面声传播时间。它将允许对GS结构和运输进行独立的估计。当IES-GEM切变与HEF输送或底部压力加上近底部流速计记录相结合时，IES-GEM切变被转换为绝对速度剖面。与早期分析的比较也将有助于评估广泛使用的传统分析技术的性能。此外，一些重要的数据，从水平电场记录仪，将首次分析其有关墨西哥湾流的结构和变化的信息。