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

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:: Turbulent Salinity Flux and the Dissipation Spectrum of Salinity JONATHAN D. NASH* AND JAMES N. MOUM

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

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

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

Seasonal sea surface cooling in the equatorial Pacific cold tongue controlled by ocean mixing

Creator:: Moum, James N., Perlin, Alexander, Nash, Jonathan D., and McPhaden, Michael J.
Abstract:: Sea surface temperature (SST) is a critical control on the atmosphere(1), and numerical models of atmosphere-ocean circulation emphasize its accurate prediction. Yet many models demonstrate large, systematic biases in simulated SST in the equatorial 'cold tongues' (expansive regions of net heat uptake from the atmosphere) of the Atlantic(2) and Pacific(3)...
Resource Type:: Article
Full Text:: {, Jonathan D. Nash1 & Michael J. McPhaden2 Seasurface temperature (SST) is a critical control on

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

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:: Thermocouple Probe for High-Speed Temperature Measurement in the Ocean JONATHAN D. NASH, DOUGLAS R. CALDWELL

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

Small-Scale Processes in the Coastal Ocean

Creator:: Moum, James N., Nash, Jonathan D., and Klymak, Jody M.
Abstract:: Varied observations over Oregon’s continental shelf illustrate the beauty and complexity of geophysical flows in coastal waters. Rapid, creative, and sometimes fortuitous sampling from ships and moorings has allowed detailed looks at boundary layer processes, internal waves (some extremely nonlinear), and coastal currents, including how they interact. These processes drive...
Resource Type:: Article
Full Text:: Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. Jonathan D. Nash is Associate Professor

ScholarsArchive@OSU

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

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

Estimating Salinity Variance Dissipation Rate from Conductivity Microstructure Measurements

Structure and dynamics of the Columbia River tidal plume front

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

Seasonal sea surface cooling in the equatorial Pacific cold tongue controlled by ocean mixing

Structure of the Baroclinic Tide Generated at Kaena Ridge, Hawaii

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

Internal Tide Reflection and Turbulent Mixing on the Continental Slope

Small-Scale Processes in the Coastal Ocean

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