Internal Tides and Inertial Oscillations: Analysis of Observations in the Gulf Stream South of New England

内潮汐和惯性振荡：新英格兰南部墨西哥湾流的观测分析

• 批准号: 0453681
• 负责人: D. Randolph Watts
• 金额: $ 17.43万
• 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: 2005
• 资助国家: 美国
• 起止时间: 2005-03-15 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0453681&HistoricalAwards=false
• 关键词: Internal; Tides; Inertial; Oscillations; Analysis

ABSTRACTOCE-0453681 WattsThe goal of this project is to understand the impact of the Gulf Stream on the horizontal and vertical distributions of internal tides and inertial oscillations in the region south of New England. An existing dataset from the Synoptic Ocean Prediction (SYNOP) experiment (1988-1990) will be reanalyzed. The Central Array of the SYNOP experiment comprised 24 inverted echo sounders and 13 tall current meter moorings collecting currents at 4 levels, plus 3 with Acoustic Doppler Current Profilers. The SYNOP experiment was highly successful, improving the physical understanding of the mesoscale meandering of the Gulf Stream. However, the high-frequency band signals (inertial to semi-diurnal frequencies) of these data have not yet been analyzed and reported upon. The reanalysis of the SYNOP dataset provides a cost-effective opportunity to achieve the goal.The mean and shorter term distribution of internal tides and inertial oscillations will be related to the observed circulation and compare to predicted propagation paths in the Gulf Stream. Exciting preliminary evidence that internal tides, generated by strong cross-slope tidal currents associated with the Bay of Fundy tides, are blocked from crossing the Gulf Stream, and that near-inertial oscillations may be concentrated by the vorticity of the Gulf Stream, will be investigated.Broader impact. The energy available for ocean mixing by internal tides and near-inertial oscillations are variable in space and time. The understanding gained from this study will validate model and theoretical concepts regarding the process by which they interact with currents and can be trapped or focused.

ABSTRACTOCE-0453681 Watts 该项目的目标是了解墨西哥湾流对新英格兰南部地区内潮汐和惯性振荡水平和垂直分布的影响。来自天气海洋预测（SYNOP）实验（1988-1990）的现有数据集将被重新分析。 SYNOP 实验的中央阵列由 24 个倒置回声测深仪和 13 个高海流计系泊装置组成，用于收集 4 个级别的海流，另外还有 3 个带有声学多普勒海流剖面仪的海流计。 SYNOP 实验非常成功，提高了对墨西哥湾流中尺度蜿蜒的物理理解。 然而，这些数据的高频段信号（惯性到半日频率）尚未得到分析和报告。 SYNOP 数据集的重新分析为实现这一目标提供了一个经济高效的机会。内潮汐和惯性振荡的平均和短期分布将与观测到的环流相关，并与湾流中的预测传播路径进行比较。令人兴奋的初步证据表明，由与芬迪湾潮汐相关的强烈横坡潮流产生的内潮汐被阻止穿过墨西哥湾流，并且近惯性振荡可能被墨西哥湾流的涡度集中，这些将受到更广泛的影响。通过内潮汐和近惯性振荡使海洋混合的可用能量在空间和时间上是可变的。从这项研究中获得的理解将验证有关它们与电流相互作用以及被捕获或聚焦的过程的模型和理论概念。