Index Catalog // ScholarsArchive@OSU

Topics in ocean turbulence : thermocouples, salt fluxes, and internal hydraulics

Creator:: Nash, Jonathan D.
Resource Type:: Dissertation
Full Text:: constant vertical diffusivity in a constant depth domain with barotropic advection. 136 5.16 Potential

Three-Dimensional Double-Ridge Internal Tide Resonance in Luzon Strait

Creator:: Buijsman, Maarten C., Klymak, Jody M., Legg, Sonya, Alford, Matthew H., Farmer, David, MacKinnon, Jennifer A., Nash, Jonathan D., Park, Jae-Hun, Pickering, Andy, and Simmons, Harper
Abstract:: The three-dimensional (3D) double-ridge internal tide interference in the Luzon Strait in the South China Sea is examined by comparing 3D and two-dimensional (2D) realistic simulations. Both the 3D simulations and observations indicate the presence of 3D first-mode (semi)diurnal standing waves in the 3.6-km-deep trench in the strait. As in...
Resource Type:: Article
Full Text:: tides and the local baro- tropic flow can either enhance or decrease the barotropic- to-baroclinic

The Unpredictable Nature of Internal Tides on Continental Shelves

Creator:: Nash, Jonathan D., Kelly, Samuel M., Shroyer, Emily L., Moum, James N., and Duda, Timothy F.
Abstract:: Packets of nonlinear internal waves (NLIWs) in a small area of the Mid-Atlantic Bight were 10 times more energetic during a local neap tide than during the preceding spring tide. This counterintuitive result cannot be explained if the waves are generated near the shelf break by the local barotropic tide...
Resource Type:: Article
Full Text:: cannot be explained if the waves are generated near the shelf break by the local barotropic tide since

The role of turbulence stress divergence in decelerating a river plume

Creator:: Kilcher, Levi F., Nash, Jonathan D., and Moum, James N.
Abstract:: Turbulence controls the composition of river plumes through mixing and alters the plume's trajectory by diffusing its momentum. While believed to play a crucial role in decelerating river-source waters, the turbulence stress in a near-field river plume has not previously been observationally quantified. In this study, finely resolved density, velocity,...
Resource Type:: Article
Full Text:: largely barotropic, suggesting that it is associated with time dependence of the barotropic tide, and not

The formation and fate of internal waves in the South China Sea

Creator:: Alford, Matthew H., Peacock, Thomas, MacKinnon, Jennifer A., Nash, Jonathan D., Buijsman, Maarten C., Centurioni, Luca R., Chao, Shenn-Yu, Chang, Ming-Huei, Farmer, David M., Fringer, Oliver B., Fu, Ke-Hsien, Gallacher, Patrick C., Graber, Hans C., Helfrich, Karl R., Jachec, Steven M., Jackson, Christopher R., Klymak, Jody M., Ko, Dong S., Jan, Sen, Johnston, T. M. Shaun, Legg, Sonya, Lee, I-Huan, Lien, Ren-Chieh, Mercier, Matthieu J., Moum, James N., Musgrave, Ruth, Park, Jae-Hun, Pickering, Andrew I., Pinkel, Robert, Rainville, Luc, Ramp, Steven R., Rudnick, Daniel L., Sarkar, Sutanu, Scotti, Alberto, Simmons, Harper L., St. Laurent, Louis C., Venayagamoorthy, Subhas K., Wang, Yu-Huai, Wang, Joe, Yang, Yiing J., Paluszkiewicz, Theresa, and Tang, Tswen-Yung (David)
Abstract:: Internal gravity waves, the subsurface analogue of the familiar surface gravity waves that break on beaches, are ubiquitous in the ocean. Because of their strong vertical and horizontal currents, and the turbulent mixing caused by their breaking, they affect a panoply of ocean processes, such as the supply of nutrients...
Resource Type:: Article
Full Text:: results from both programmes. The internal tides derive their energy from the barotropic (surface) tide

The Direct Breaking of Internal Waves at Steep Topography

Creator:: Klymak, Jody M., Legg, Sonya, Alford, Matthew H., Buijsman, Maarten, Pinkel, Robert, and Nash, Jonathan D.
Abstract:: Internal waves are often observed to break close to the seafloor topography that generates them, or from which they scatter. This breaking is often spectacular, with turbulent structures observed hundreds of meters above the seafloor, and driving turbulence dissipations and mixing up to 10,000 times open-ocean levels. This article provides...
Resource Type:: Article
Full Text:: continental slope. Driven by a combina- tion of barotropic and baroclinic tides that flow over small-scale

The Cascade of Tidal Energy from Low to High Modes on a Continental Slope

Creator:: Kelly, Samuel M., Nash, Jonathan D., Martini, Kim I., Alford, Matthew H., and Kunze, Eric
Abstract:: The linear transfer of tidal energy from large to small scales is quantified for small tidal excursion over a near-critical continental slope. A theoretical framework for low-wavenumber energy transfer is derived from “flat bottom” vertical modes and evaluated with observations from the Oregon continental slope. To better understand the observations,...
Resource Type:: Article
Full Text:: equations (Miles 1974). Higher-mode tides (n $ 1) make up the internal tide. These tides have hor- izontal

Structure of the Baroclinic Tide Generated at Kaena Ridge, Hawaii

Creator:: Nash, Jonathan D., Kunze, Eric, Lee, Craig M., and Sanford, Thomas B.
Abstract:: Repeat transects of full-depth density and velocity are used to quantify generation and radiation of the semidiurnal internal tide from Kaena Ridge, Hawaii. A 20-km-long transect was sampled every 3 h using expendable current profilers and the absolute velocity profiler. Phase and amplitude of the baroclinic velocity, pressure, and vertical...
Resource Type:: Article
Full Text:: tides has been revived by recog- nition that up to one-third of the surface tide dissipa- tion occurs in

Shallow Water '06: A Joint Acoustic Propagation/Nonlinear Internal Wave Physics Experiment

Creator:: Tang, Dajun, Moum, James N., Lynch, James F., Abbot, Phil, Chapman, Ross, Dahl, Peter H., Duda, Timothy F., Gawarkiewicz, Glen, Glenn, Scott, Goff, John A., Graber, Hans, Kemp, John, Maffei, Andrew, Nash, Jonathan D., and Newhall, Arthur
Abstract:: Since the end of the Cold War, the US Navy has had an increasing interest in continental shelves and slopes as operational areas. To work in such areas requires a good understanding of ocean acoustics, coastal physical oceanography, and, in the modern era, autonomous underwater vehicle (AUV) operations. Each area...
Resource Type:: Article
Full Text:: difficult. During SW06, NLIW packets were observed at all phases of the barotropic tide. This

Observations of Internal Tides on the Oregon Continental Slope

Creator:: Martini, Kim I., Alford, Matthew H., Kunze, Eric, Kelly, Samuel M., and Nash, Jonathan D.
Abstract:: A complex superposition of locally forced and shoaling remotely generated semidiurnal internal tides occurs on the Oregon continental slope. Presented here are observations from a zonal line of five profiling moorings deployed across the continental slope from 500 to 3000 m, a 24-h expendable current profiler (XCP) survey, and five...
Resource Type:: Article
Full Text:: barotropic tides flow over bathymetric features, they generate baroclinic in- ternal tides. The conversion

Measurement of Tidal Form Drag Using Seafloor Pressure Sensors

Creator:: Warner, Sally J., MacCready, Parker, Moum, James N., and Nash, Jonathan D.
Abstract:: As currents flow over rough topography, the pressure difference between the up-and downstream sides results in form drag-a force that opposes the flow. Measuring form drag is valuable because it can be used to estimate the loss of energy from currents as they interact with topography. An array of bottom...
Resource Type:: Article
Full Text:: form drag occurs during the strong flood tides as highlighted for one tide with the vertical gray

Internal Tides and Turbulence along the 3000-m Isobath of the Hawaiian Ridge

Creator:: Lee, Craig M., Sanford, Thomas B., Kunze, Eric, Nash, Jonathan D., Merrifield, Mark A., and Holloway, Peter E.
Abstract:: Full-depth velocity and density profiles taken along the 3000-m isobath characterize the semidiurnal internal tide and bottom-intensified turbulence along the Hawaiian Ridge. Observations reveal baroclinic energy fluxes of 21 ± 5 kW m⁻¹ radiating from French Frigate Shoals, 17 ± 2.5 kW m⁻¹ from Kauai Channel west of Oahu, and...
Resource Type:: Article
Full Text:: rejuvenated interest in internal tides. Assimilation of satellite altim- etry into the barotropic tidal

Internal Tide Reflection and Turbulent Mixing on the Continental Slope

Creator:: Nash, Jonathan D., Kunze, Eric, Toole, John M., and Schmitt, Ray W.
Abstract:: Observations of turbulence, internal waves, and subinertial flow were made over a steep, corrugated continental slope off Virginia during May–June 1998. At semidiurnal frequencies, a convergence of low-mode, onshore energy flux is approximately balanced by a divergence of high-wavenumber offshore energy flux. This conversion occurs in a region where the...
Resource Type:: Article
Full Text:: focused on the generation of internal tides by barotropic tides (Merrifield et al. 2001; Althaus et al

Internal hydraulic flows on the continental shelf: High drag states over a small bank

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: Observations of currents, hydrography, and turbulence provide unambiguous evidence for hydraulic control of flow over an isolated three-dimensional topographic feature on Oregon’s continental shelf. The flow becomes critical at the crest of the bank, forming a strong supercritical downslope flow in the lower layer. Farther downstream, internal hydraulic jumps form...
Resource Type:: Article
Full Text:: steered off- shore and around Heceta Bank to the southwest. Currents are modulated by internal tides

Internal Bores and Breaking Internal Tides on the Oregon Continental Slope

Creator:: Martini, Kim I., Alford, Matthew H., Kunze, Eric, Kelly, Samuel M., and Nash, Jonathan D.
Abstract:: Observations of breaking internal tides on the Oregon continental slope during a 40-day deployment of 5 moorings along 43°12'N are presented. Remotely generated internal tides shoal onto the slope, steepen, break, and form turbulent bores that propagate upslope independently of the internal tide. A high-resolution snapshot of a single bore...
Resource Type:: Article
Full Text:: 2003; Zhao and Alford 2009). Low-mode in- ternal tides become incoherent with the surface tide as

Global Patterns of Diapycnal Mixing from Measurements of the Turbulent Dissipation Rate

Creator:: Waterhouse, Amy F., MacKinnon, Jennifer A., Nash, Jonathan D., Alford, Matthew H., Kunze, Eric, Simmons, Harper L., Polzin, Kurt L., St. Laurent, Louis C., Sun, Oliver M., Pinkel, Robert, Talley, Lynne D., Whalen, Caitlin B., Huussen, Tycho N., Carter, Glenn S., Fer, Ilker, Waterman, Stephanie, Naveira Garabato, Alberto C., Sanford, Thomas B., and Lee, Craig M.
Abstract:: The authors present inferences of diapycnal diffusivity from a compilation of over 5200 microstructure profiles. As microstructure observations are sparse, these are supplemented with indirect measurements of mixing obtained from (i) Thorpe-scale overturns from moored profilers, a finescale parameterization applied to (ii) shipboard observations of upper-ocean shear, (iii) strain as...
Resource Type:: Article
Full Text:: in- ternal wave generation from winds and tides because in- ternal wave breaking is thought to be

Estimating Internal Wave Energy Fluxes in the Ocean

Creator:: Nash, Jonathan D., Alford, Matthew H., and Kunze, Eric
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...
Resource Type:: Article
Full Text:: com- putations have been used to quantify internal tide gen- eration at ridges in observations

Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges

Creator:: Alford, Matthew H., MacKinnon, Jennifer A., Nash, Jonathan D., Simmons, Harper, Pickering, Andy, Klymak, Jody M., Pinkel, Robert, Sun, Oliver, Rainville, Luc, Musgrave, Ruth, Beitzel, Tamara, Fu, Ke-Hsien, and Lu, Chung-Wei
Abstract:: Internal tide generation, propagation, and dissipation are investigated in Luzon Strait, a system of two quasi-parallel ridges situated between Taiwan and the Philippines. Two profiling moorings deployed for about 20 days and a set of nineteen 36-h lowered ADCP-CTD time series stations allowed separate measurement of diurnal and semidiurnal internal...
Resource Type:: Article
Full Text:: barotropic tidal flow over undersea to- pography, a fraction of the energy lost to the barotropic tide is

Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges

Creator:: Alford, Matthew H., MacKinnon, Jennifer A., Nash, Jonathan D., Simmons, Harper, Pickering, Andy, Klymak, Jody M., Pinkel, Robert, Sun, Oliver, Rainville, Luc, Musgrave, Ruth, Beitzel, Tamara, Fu, Ke-Hsien, and Lu, Chung-Wei
Abstract:: Internal tide generation, propagation, and dissipation are investigated in Luzon Strait, a system of two quasi-parallel ridges situated between Taiwan and the Philippines. Two profiling moorings deployed for about 20 days and a set of nineteen 36-h lowered ADCP–CTD time series stations allowed separate measurement of diurnal and semidiurnal internal...
Resource Type:: Article
Full Text:: barotropic tidal flow over undersea to- pography, a fraction of the energy lost to the barotropic tide is

Are Any Coastal Internal Tides Predictable?

Creator:: Nash, Jonathan D., Shroyer, Emily L., Kelly, Samuel M., Inall, Mark E., Duda, Timothy F., Levine, Murray D., Jones, Nicole L., and Musgrave, Ruth C.
Abstract:: Surface tides are the heartbeat of the ocean. Because they are controlled by Earth's motion relative to other astronomical objects in our solar system, surface tides act like clockwork and generate highly deterministic ebb and flow familiar to all mariners. In contrast, baroclinic motions at tidal frequencies are much more...
Resource Type:: Article
Full Text:: case, the internal tide is strongly decoupled from the barotropic forcing; shoaling internal tides

An Estimate of Tidal Energy Lost to Turbulence at the Hawaiian Ridge

Creator:: Klymak, Jody M., Moum, James N., Nash, Jonathan D., Kunze, Eric, Girton, James B., Carter, Glenn S., Lee, Craig M., Sanford, Thomas B., and Gregg, Michael C.
Abstract:: 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. The diffusivity near the seafloor was, on average, 15 times that in the midwater column. At 1000-m...
Resource Type:: Article
Full Text:: barotropic tide. 1. Introduction One of the more perplexing problems in oceanogra- phy is the dichotomy

A Coupled Model for Laplace’s Tidal Equations in a Fluid with One Horizontal Dimension and Variable Depth

Creator:: Kelly, Samuel M., Jones, Nichole L., and Nash, Jonathan D.
Abstract:: Abstract: Tide-topography interactions dominate the transfer of tidal energy from large to small scales. At present, it is poorly understood how low-mode internal tides reflect and scatter along the continental margins. Here, the coupling equations for linear tides model (CELT) are derived to determine the independent modal solutions to Laplace's...
Resource Type:: Article
Full Text:: internal tides are found to transmit about 5% of their incident energy flux to the surface tide where they

ScholarsArchive@OSU

Topics in ocean turbulence : thermocouples, salt fluxes, and internal hydraulics

Three-Dimensional Double-Ridge Internal Tide Resonance in Luzon Strait

The Unpredictable Nature of Internal Tides on Continental Shelves

The role of turbulence stress divergence in decelerating a river plume

The formation and fate of internal waves in the South China Sea

The Direct Breaking of Internal Waves at Steep Topography

The Cascade of Tidal Energy from Low to High Modes on a Continental Slope

Structure of the Baroclinic Tide Generated at Kaena Ridge, Hawaii

Shallow Water '06: A Joint Acoustic Propagation/Nonlinear Internal Wave Physics Experiment

Observations of Internal Tides on the Oregon Continental Slope

Measurement of Tidal Form Drag Using Seafloor Pressure Sensors

Internal Tides and Turbulence along the 3000-m Isobath of the Hawaiian Ridge

Internal Tide Reflection and Turbulent Mixing on the Continental Slope

Internal hydraulic flows on the continental shelf: High drag states over a small bank

Internal Bores and Breaking Internal Tides on the Oregon Continental Slope

Global Patterns of Diapycnal Mixing from Measurements of the Turbulent Dissipation Rate

Estimating Internal Wave Energy Fluxes in the Ocean

Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges

Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges

Are Any Coastal Internal Tides Predictable?

An Estimate of Tidal Energy Lost to Turbulence at the Hawaiian Ridge

A Coupled Model for Laplace’s Tidal Equations in a Fluid with One Horizontal Dimension and Variable Depth

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