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 .

ABSTRACTOCE-0352229作为北大西洋风驱动环流的最强元素，墨西哥湾流一直是广泛的实证研究、理论辩论和建模模拟的焦点。它的特性一直是判断数值模型真实性的重要指标。尽管受到如此关注，哈特拉斯角和大浅滩之间的墨西哥湾流的一些重要特征仍然鲜为人知。作为获取更多信息和见解的一种经济高效的方式，PI 将分析来自墨西哥湾流的现有数据，这些数据要么以前没有被分析过，要么现在可以更准确、更完整地分析。 这些数据是在为期两年（1988-1990）的天气海洋预测（SYNOP）实验中收集的，这是有史以来在墨西哥湾流进行的最全面的实验。虽然最初的 SYNOP 研究人员已经利用 SYNOP 数据完成了对湾流运动学和动力学的出色研究，但该数据中仍然锁定了大量信息，因为只有在过去四年中才开发出可以充分利用的分析技术。众多倒回声测深仪 (IES) 记录仪的一部分）或处理系泊电流和温度数据，而不会因系泊运动修正不足和“流”坐标投影不准确而产生偏差。该方法利用 IES 阵列附近的历史水文数据来构建具有自变量深度（实际上是压力）和海底到海面声学传播时间的温度函数（称为最严重经验模式或 GEM）。它将允许对 GS 结构和运输进行独立估计。当 IES-GEM 剪切与 HEF 传输或底部压力加上近底部水流计记录相结合时，IES-GEM 剪切将转换为绝对速度剖面。与早期分析进行比较还可以评估广泛使用的传统分析技术的性能。此外，来自水平电场记录仪的一些重要数据将首次进行分析，以获取有关湾流结构和变化的信息。