Index Catalog // ScholarsArchive@OSU

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

Creator:: Nash, Jonathan D.
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Jonathan D. Nash for the

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:: Equations in a Fluid with One Horizontal Dimension and Variable Depth SAMUEL M. KELLY AND NICOLE L. JONES

Estimating Salinity Variance Dissipation Rate from Conductivity Microstructure Measurements

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: At the smallest length scales, conductivity measurements include a contribution from salinity fluctuations in the inertial–convective and viscous–diffusive ranges of the turbulent scalar variance spectrum. Interpreting these measurements is complicated because conductivity is a compound quantity of both temperature and salinity. Accurate estimates of the dissipation rate of salinity variance...
Resource Type:: Article
Full Text:: Microstructure Measurements JONATHAN D. NASH AND JAMES N. MOUM College of Oceanic and Atmospheric Sciences

Microstructure estimates of turbulent salinity flux and the dissipation spectrum of salinity

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: Direct determination of the irreversible turbulent flux of salinity in the ocean has not been possible because of the complexity of measuring salinity on the smallest scales over which it mixes. Presented is an analysis of turbulent salinity microstructure from measurements using a combined fast-conductivity/temperature probe on a slowly falling...
Resource Type:: Article
Full Text:: phoc_32_903.2312_2333.tp 2312 VOLUME 32J O U R N A L O F P H Y S I C A

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:: Jonathan D. Nash • and James N. Moum College of Oceanic and Atmospheric Sciences, Oregon State University

Structure and dynamics of the Columbia River tidal plume front

Creator:: Kilcher, Levi F. and Nash, Jonathan D.
Abstract:: Time‐dependent buoyant plumes form at the outflow of tidally dominated estuaries. When estuary discharge velocity exceeds plume internal wave speed c, a sharp front forms at the plume’s leading edge that expands from the time‐dependent source. Using observations of the Columbia River tidal plume from multiple tidal cycles we characterize...
Resource Type:: Article
Full Text:: dynamics of the Columbia River tidal plume front Levi F. Kilcher1 and Jonathan D. Nash1 Received 21

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:: on Continental Shelves JONATHAN D. NASH College of Earth, Ocean and Atmospheric Sciences, Oregon

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:: JONATHAN D. NASH College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon

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:: phoc_34_505.1117_1134.tp MAY 2004 1117N A S H E T A L . q 2004

A Thermocouple Probe for High-Speed Temperature Measurement in the Ocean

Creator:: Nash, Jonathan D., Caldwell, Douglas R., Zelman, Michael J., and Moum, James N.
Abstract:: A fast-response chromel–constantan thermocouple sensor was constructed for use on the microstructure profiler Chameleon and used for 60 ocean profiles off the coast of Oregon. The stability of the thermocouple was compared to that of an FP07 microbead thermistor, and its frequency response was compared to a high-resolution microconductivity probe....
Resource Type:: Article
Full Text:: atot_16_1119.1474_1482 1474 VOLUME 16J O U R N A L O F A T M O S P

ScholarsArchive@OSU

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

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

Estimating Salinity Variance Dissipation Rate from Conductivity Microstructure Measurements

Microstructure estimates of turbulent salinity flux and the dissipation spectrum of salinity

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

Structure and dynamics of the Columbia River tidal plume front

The Unpredictable Nature of Internal Tides on Continental Shelves

Structure of the Baroclinic Tide Generated at Kaena Ridge, Hawaii

Internal Tide Reflection and Turbulent Mixing on the Continental Slope

A Thermocouple Probe for High-Speed Temperature Measurement in the Ocean

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