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

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。将重新分析从天气海洋预报（SYNOP）实验（1988-1990）的现有数据集。 SYNOP实验的中央阵列包括24个倒置回声测深仪和13个高流速计系泊装置，收集4个水平的水流，加上3个声学多普勒水流剖面仪。SYNOP实验非常成功，提高了对墨西哥湾流中尺度弯曲的物理理解。 然而，这些数据的高频带信号（惯性到半日频率）尚未得到分析和报告。 对SYNOP数据集的再分析为实现这一目标提供了一个具有成本效益的机会。内潮和惯性振荡的平均和短期分布将与观测到的环流相关，并与墨西哥湾流的预测传播路径进行比较。令人兴奋的初步证据表明，与芬迪湾潮汐有关的强烈跨坡潮流产生的内潮被阻止穿越墨西哥湾流，并且墨西哥湾流的涡度可能集中了近惯性振荡，将进行调查。内潮和近惯性振荡可用于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电流相互作用的过程的模型和理论概念，并可以被捕获或集中。

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.