Are Any Coastal Internal Tides Predictable?

Nash, Jonathan D.; Shroyer, Emily L.; Kelly, Samuel M.; Inall, Mark; Duda, Timothy F.; Levine, Murray D.; Jones, Nicole L.; Musgrave, Ruth

doi:10.5670/oceanog.2012.44

Cited by 85 publications

(78 citation statements)

References 47 publications

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“…propagation speed in shallow depths relative to strong low-frequency currents makes them even more variable and complex than in the deep ocean (e.g., see Nash et al, 2012, in this issue).…”

mentioning

confidence: 99%

Internal Waves on the Washington Continental Shelf

Alford¹,

Mickett²,

Zhang³

et al. 2012

oceanog

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“…propagation speed in shallow depths relative to strong low-frequency currents makes them even more variable and complex than in the deep ocean (e.g., see Nash et al, 2012, in this issue).…”

mentioning

confidence: 99%

Internal Waves on the Washington Continental Shelf

Alford¹,

Mickett²,

Zhang³

et al. 2012

oceanog

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“…This potentially indicates year-to-year variability in the amount of incoming remotely generated semidiurnal internal wave energy (Nash et al 2012a). The manifestation of remotely generated internal tides over the Oregon shelf will need future consideration.…”

Section: Discussionmentioning

confidence: 98%

“…In this work, we focus on a comparison of model wave propagation through the phasing between mid-and inner-shelf moorings and along-shelf differences due to the three-dimensionality of Heceta Bank. The internal tide within this model is driven solely by local dynamics and will not reproduce any of the features of shoaling remotely generated internal tidal energy (e.g., Nash et al 2012b). For comparison purposes, a 4-day window of the yearlong model run is taken to be typical of internal tide propagation within the model.…”

Section: B a Comparison To Romsmentioning

confidence: 99%

“…As internal wave speeds decrease over a shoaling shelf and become comparable to mesoscale flows, their interaction is expected to create large temporal variability and interference patterns of internal wave energy (Nash et al 2012a). The relationship between internal tides and background shelf conditions such as coastal upwelling has been modeled in a twodimensional configuration (Kurapov et al 2010) but has been difficult to observe because of the short duration of many time series.…”

Section: Introductionmentioning

confidence: 99%

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Semidiurnal Baroclinic Tides on the Central Oregon Inner Shelf

Suanda

Barth

2015

Journal of Physical Oceanography

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Semidiurnal velocity and density oscillations are examined over the mid-and inner continental shelf near Heceta Bank on the Oregon coast. Measurements from two long-term observation networks with sites on and off the submarine bank reveal that both baroclinic velocities and displacements are dominated by the first mode, with larger velocities on the midshelf and northern parts of the bank. Midshelf sites have current ellipses that are near the theoretical value for single, progressive internal tidal waves compared to more linearly polarized currents over the inner shelf. Baroclinic current variability is not correlated to the springneap cycle and is uncorrelated between mooring locations. An idealized model of two internal waves propagating from different directions reproduces some of the observed variability in semidiurnal ellipse parameters. At times, the phasing between moorings along a cross-shelf transect are consistent with onshelf wave propagation, a characteristic also present in the output of a three-dimensional regional circulation model. Regional wind-driven upwelling/downwelling influences stratification at all shelf moorings. At locations north of the bank, stronger baroclinic velocities were found during periods of higher background stratification.

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“…They can propagate over hundreds of kilometers, and since their propagation condition is related to the stratification of the ocean, they are distorted by the circulation which modifies the 3-D density field. As a result, in the coastal area, they often appear as highly nonlinear oscillations with wide spectral content that are usually not predictable, even on short time scale [1]. In situ time series of temperature and currents are then necessary to understand their characteristics and the way they propagate and modify their shape to the coast.…”

Section: Introductionmentioning

confidence: 99%

Advanced Spectral Analysis and Cross Correlation Based on the Empirical Mode Decomposition: Application to the Environmental Time Series

Ismail

Lazure

Puillat

2015

IEEE Geosci. Remote Sensing Lett.

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In marine sciences, time series are often nonlinear and nonstationary. Adequate and specific methods are needed to analyze such series. In this letter, an application of the empirical mode decomposition method (EMD) associated to the Hilbert spectral analysis (HSA) is presented. Furthermore, EMD-based time-dependent intrinsic correlation (TDIC) analysis is applied to consider the correlation between two nonstationary time series. Four temperature time series obtained from automatic measurements in nearshore waters of the Réunion island are considered, recorded every 10 min from July 2011 to January 2012. The application of the EMD on these series and the estimation of their power spectra using the HSA are illustrated. The authors identify low-frequency tidal waves and display the pattern of correlations at different scales and different locations. By TDIC analysis, it was concluded that the high-frequency modes have small correlation, whereas the trends are perfectly correlated.

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Are Any Coastal Internal Tides Predictable?

Cited by 85 publications

References 47 publications

Internal Waves on the Washington Continental Shelf

Internal Waves on the Washington Continental Shelf

Semidiurnal Baroclinic Tides on the Central Oregon Inner Shelf

Advanced Spectral Analysis and Cross Correlation Based on the Empirical Mode Decomposition: Application to the Environmental Time Series

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