Journal Article10.1175/JTECH1784.1
Estimating Internal Wave Energy Fluxes in the Ocean
TL;DR: In this article, the estimation of internal wave energy fluxes from ocean observations that may be sparse in either time or depth are considered, and errors of ∼10% are typical for estimates from six full-depth profiles spanning 15 h.
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Abstract: Energy flux is a fundamental quantity for understanding internal wave generation, propagation, and dissipation. In this paper, the estimation of internal wave energy fluxes 〈u′p′〉 from ocean observations that may be sparse in either time or depth are considered. Sampling must be sufficient in depth to allow for the estimation of the internal wave–induced pressure anomaly p′ using the hydrostatic balance, and sufficient in time to allow for phase averaging. Data limitations that are considered include profile time series with coarse temporal or vertical sampling, profiles missing near-surface or near-bottom information, moorings with sparse vertical sampling, and horizontal surveys with no coherent resampling in time. Methodologies, interpretation, and errors are described. For the specific case of the semidiurnal energy flux radiating from the Hawaiian ridge, errors of ∼10% are typical for estimates from six full-depth profiles spanning 15 h.
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•Journal Article
Oceanic vertical mixing: a review and a model with a nonlocal boundary layer parameterization
TL;DR: In this article, a new parameterization of oceanic boundary layer mixing is developed to accommodate some of this physics, including a scheme for determining the boundary layer depth h, where the turbulent contribution to the vertical shear of a bulk Richardson number is parameterized.
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The formation and fate of internal waves in the South China Sea
Matthew H. Alford,Matthew H. Alford,Thomas Peacock,Jennifer A. MacKinnon,Jonathan D. Nash,Maarten C. Buijsman,Luca Centurioni,Shenn-Yu Chao,Ming-Huei Chang,David M. Farmer,David M. Farmer,Oliver B. Fringer,Ke-Hsien Fu,Patrick C. Gallacher,Hans C. Graber,Karl R. Helfrich,Steven M. Jachec,Christopher R. Jackson,Jody M. Klymak,Dong S. Ko,Sen Jan,T. M. Shaun Johnston,Sonya Legg,I-Huan Lee,Ren-Chieh Lien,Matthieu Mercier,James N. Moum,Ruth Musgrave,Jae-Hun Park,Andy Pickering,Andy Pickering,Robert Pinkel,Luc Rainville,Steven R. Ramp,Daniel L. Rudnick,Sutanu Sarkar,Alberto Scotti,Harper L. Simmons,Louis St. Laurent,Subhas K. Venayagamoorthy,Yu-Huai Wang,Joe Wang,Yiing Jang Yang,Theresa Paluszkiewicz,Tswen Yung Tang +44 more
TL;DR: This work shows that the waves begin as sinusoidal disturbances rather than arising from sharp hydraulic phenomena, and reveals the existence of >200-metre-high breaking internal waves in the region of generation that give rise to turbulence levels >10,000 times that in the open ocean.
Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges
Matthew H. Alford,Jennifer A. MacKinnon,Jonathan D. Nash,Harper L. Simmons,Andy Pickering,Jody M. Klymak,Robert Pinkel,Oliver M. T. Sun,Luc Rainville,Ruth Musgrave,Tamara Beitzel,Ke-Hsien Fu,Chung-Wei Lu +12 more
TL;DR: In this paper, the authors investigated internal tide generation, propagation, and dissipation in Luzon Strait, a system of two quasi-parallel ridges situated between Taiwan and the Philippines.
An Estimate of Tidal Energy Lost to Turbulence at the Hawaiian Ridge
Jody M. Klymak,James N. Moum,Jonathan D. Nash,Eric Kunze,James B. Girton,Glenn S. Carter,Craig M. Lee,Thomas B. Sanford,Michael C. Gregg +8 more
TL;DR: In this paper, an integrated analysis of turbulence observations from four unique instrument platforms obtained over the Hawaiian Ridge leads to an assessment of the vertical, cross-ridge, and along-ridge structure of turbulence dissipation rate and diffusivity.
Internal waves across the Pacific
Matthew H. Alford,Jennifer A. MacKinnon,Zhongxiang Zhao,Robert Pinkel,Robert Pinkel,Jody M. Klymak,Thomas Peacock +6 more
TL;DR: In this paper, the long-range propagation of the semidiurnal internal tide northward from the Hawaiian ridge and its susceptibility to parametric subharmonic instability (PSI) at the critical latitude, λc = 28.8°N, were examined in spring 2006 with intensive shipboard and moored observations spanning 25-37°N along a tidal beam.
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References
Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterization
TL;DR: In this article, a new parameterization of oceanic boundary layer mixing is developed to accommodate some of this physics, including a scheme for determining the boundary layer depth h, where the turbulent contribution to the vertical shear of a bulk Richardson number is parameterized.
4.2K
A Hierarchy of Turbulence Closure Models for Planetary Boundary Layers.
George L. Mellor,Tetsuji Yamada +1 more
TL;DR: In this article, the authors consider simplification based on the observation that the parameters governing the degree of anisotropy are small, and propose a simplification approach for the problem of a planetary boundary layer subject to a diurnally varying surface heat flux or surface temperature.
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Abyssal recipes II: energetics of tidal and wind mixing
Walter Munk,Carl Wunsch +1 more
TL;DR: Using the Levitus climatology, the authors showed that 2.1 TW (terawatts) is required to maintain the global abyssal density distribution against 30 Sverdrups of deep water formation.
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Data Analysis Methods in Physical Oceanography
Abstract: Chapter and section headings: Preface. Acknowledgments. Data Acquisition and Recording. Introduction. Basic sampling requirements. Temperature. Salinity. Depth or pressure. Sea-level measurement. Eulerian currents. Lagrangian current measurements. Wind. Precipitation. Chemical tracers. Transient chemical tracers. Data Processing and Presentation. Introduction. Calibration. Interpolation. Data presentation. Statistical Methods and Error Handling. Introduction. Sample distributions. Probability. Moments and expected values. Common probability density functions. Central limit theorem. Estimation. Confidence intervals. Selecting the sample size. Confidence intervals for altimeter bias estimators. Estimation methods. Linear estimation (regression). Relationship between regression and correlation. Hypothesis testing. Effective degrees of freedom. Editing and despiking techniques: the nature of errors. Interpolation: filling the data gaps. Covariance and the covariance matrix. Bootstrap and jackknife methods. The Spatial Analyses of Data Fields. Traditional block and bulk averaging. Objective analysis. Empirical orthogonal functions. Normal mode analysis. Inverse methods. Time-series Analysis Methods. Basic concepts. Stochastic processes and stationarity. Correlation functions. Fourier analysis. Harmonic analysis. Spectral analysis. Spectral analysis (parametric methods). Cross-spectral analysis. Wavelet analysis. Digital filters. Fractals. Appendices. References. Index. 8 illus., 135 line drawings.
2K
•Book
Data Analysis Methods in Physical Oceanography
William J. Emery,Richard E. Thomson +1 more
- 01 Dec 1998
TL;DR: Time-series Analysis Methods and Error Handling: The Spatial Analyses of Data Fields, a meta-analysis of Stochastic processes and stationarity.
1.6K