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.

0453681瓦这个项目的目标是了解墨西哥湾流对新英格兰南部地区内潮和惯性振荡的水平和垂直分布的影响。天气海洋预报(SYNOP)实验(1988-1990)的现有数据集将被重新分析。SYNOP实验的中央阵列包括24个倒置回声探测仪和13个大流速计系泊装置，收集4个级别的电流，外加3个声学多普勒海流剖面仪。SYNOP实验非常成功，提高了对墨西哥湾流中尺度曲折的物理理解。然而，这些数据的高频段信号(惯性频率到半日频率)尚未得到分析和报告。对SYNOP数据集的重新分析为实现这一目标提供了一个经济有效的机会。内潮和惯性振荡的平均和短期分布将与观测到的环流有关，并与墨西哥湾流中预测的传播路径进行比较。令人振奋的初步证据表明，由与芬迪湾潮汐有关的强横坡潮流产生的内潮阻止了穿过墨西哥湾流，并且墨西哥湾流的涡度可能集中了近惯性振荡。可用于内潮和近惯性振荡的海洋混合的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关于它们与洋流相互作用并可能被捕获或聚焦的过程的模型和理论概念。