JONATHAN NASH
Jonathan D. Nash
Associate Professor, Physical Oceanography
College of Oceanic and Atmospheric Sciences
104 COAS Admin Bldg.
Oregon State University
Corvallis, OR, 97331
Office: 402 Burt Hall
Phone: (541) 737-4573; Fax: (541) 737-2064
| RESEARCH INTERESTS | PUBLICATIONS | OTHER LINKS | EDUCATION |
Research Interests:
Ocean Mixing
Exploring the physics of turbulence and mixing
is key to our understanding of ocean dynamics. Innovative instrumentation,
detailed analysis, and simple dynamical models enable us to:
- understand the generation and evolution of turbulence
- quantify irreversible fluxes of heat, salt, biology, chemicals and momentum
- identify the processes (the pathways to turbulence) which produce these fluxes
- determine the effects of turbulence on larger-scale flows.
Physics of Ocean Mixing
Innovative instrumentation to explore dynamics down to the smallest scales of motion are crucial to understanding ocean turbulence and its effects. Some of the projects of the Ocean Mixing Group include:- the development of a fast-response thermocouple to measure temperature fluctuations at the smallest scales.
- the analysis of highly resolved conductivity measurements to make the first direct estimates of turbulent salinity fluxes and salinity microstructure.
- the observation of internal hydraulic flows (Stonewall Bank) on the continental shelf which produce intense mixing and high drag. (Link to 4MB PDF file)
RISE: River Influences on Shelf Ecosystems
RISE is a multidisciplinary effort to study physical and biogeochemical interactions in the complex Columbia River Plume ecosystem. Detailed observations reveal intense fronts, large-amplitude internal waves, shear-driven mixing, and intense bottom boundary layers. Visit the RISE website for more details.
TWIST: Turbulence and Waves over Irregularly Sloping Topography
Observations and modelling to better understand the interaction between internal waves and the corrugated continental slope off the east coast of the United States (with Eric Kunze). Visit the TWIST webpage for more details.
HOME: Hawaiian Ocean Mixing Experiment
The Absolute Velocity Profiler (AVP) and eXpendable Current Profilers (XCP) were used to characterize the internal waves radiating from the Hawaiian Ridge and estimate the associated dissipation (with Tom Sanford, Eric Kunze, and Craig Lee). More information can be found at the AVP HOME webpage.
Recent
Publications:
Internal-tide generation and destruction by shoaling internal tides. Geophys. Res. Lett., doi:10.1029/2010GL045598, 2010 (in press, S.M. Kelly and J.D. Nash) [pdf]
Energy transformations and dissipation of nonlinear internal waves over New Jersey’s continental shelf. Nonlinear Proc. Geophys., 17, 345-360, 2010 (E.L. Shroyer, J.N. Moum, and J.D. Nash) [pdf]
Mode 2 waves on the continental shelf: Ephemeral components of the nonlinear internal wavefield. J. Geophys. Res., 115, C07001, doi:10.1029/2009JC005605, 2010 (E.L. Shroyer, J.N. Moum, and J.D. Nash) [pdf]
Vertical heat flux and lateral mass transport in nonlinear internal waves. Geophys. Res. Lett., doi:10.1029/2010GL042715, 2010 (E.L. Shroyer, J.N. Moum, and J.D. Nash) [pdf]
Internal-tide energy over topography. J. Geophys. Res., 115, C06014, doi:10.1029/2009JC005618, 2010 (S.M. Kelly, J. D. Nash, and E. Kunze) [pdf]
Structure and dynamics of the Columbia River tidal plume front. J. Geophys. Res., 115, C05S90, doi:10.1029/2009JC006066, 2010 (L. Kilcher, and J. D. Nash) [pdf]
Sea surface cooling at the Equator by subsurface mixing in tropical instability waves, Nature Geoscience, 2, 761-765, 2009. (J. N. Moum, R.-C. Lien, A. Perlin, J. D. Nash, M. C. Gregg and P. J. Wiles) [pdf].
The structure and composition of a highly-stratified, tidally-pulsed river plume. J. Geophys. Res., 114, C00B12, doi:10.1029/2008JC005036, 2009 (J. D. Nash, L. Kilcher, and J. N. Moum) [pdf]
Observations of polarity reversal in shoaling nonlinear internal waves, J. Phys. Oceanogr., 39, 691-701, 2009, 2009 (E.L. Shroyer, J.N. Moum, and J.D. Nash) [pdf]
Mixing measurements on an equatorial ocean mooring, J. Atmos. and Oceanic Tech., 26, 317-336, 2009 (J.N. Moum and J.D. Nash) [pdf]
Small-scale processes in the coastal ocean, Oceanography , 21(4), 22-33, 2008 (J.N. Moum, J.D. Nash and J.M. Klymak) [pdf]
Seafloor pressure measurements of nonlinear internal waves, J. Phys. Oceanogr., 38(2), 481-491, doi:10.1175/2007JPO3736.1, 2008 (J.N. Moum and J.D. Nash) [pdf]
Shallow Water 2006: a joint acoustic propagation/nonlinear internal wave physics experiment, Oceanography, 20(4), 156-167, 2007(D.J. Tang, J.N. Moum, J.F. Lynch, P. Abbot, R. Chapman, P. Dahl, T. Duda, G. Gawarkiewicz, S. Glenn, J.A. Goff, H. Graber, J. Kemp, A. Maffei, J. Nash and A. Newhall) [pdf]
Dissipative losses in nonlinear internal waves propagating across the continental shelf, J. Phys. Oceanogr., 37(7), 1989-1995, 2007 (J.N. Moum, D.M. Farmer, E.L. Shroyer, W.D. Smyth and L. Armi) [pdf]
Energy transport by nonlinear internal waves, J. Phys. Oceanogr., 37(7), 1968-1988, 2007 (J.N. Moum, J.M. Klymak, J.D. Nash, A. Perlin and W.D. Smyth) [pdf]
Hotspots of deep ocean mixing on the Oregon continental slope, Geophys. Res. Lett., 34, L01605, doi:10.1029/2006GL028170, 2007 (Nash, J. D., M. H. Alford, E. Kunze, K. Martini, and S. Kelly) [pdf]
Structure of the baroclinic tide generated at Kaena Ridge, Hawaii, J. Phys. Oceanogr., 36(6), 1123-1135, 2006 (Nash, J.D., E. Kunze, C.M. Lee and T.B. Sanford) [pdf]
An estimate of tidal energy lost to turbulence at the Hawaiian Ridge. J. Phys. Oceanogr., 36, 1148-1164, 2006. (Klymak, J.M., J.N. Moum, J.D. Nash, E. Kunze, J.B. Girton, G.S. Carter, C.M. Lee, T.B. Sanford, and M.C. Gregg) [pdf]
River plumes as a source of large-amplitude internal waves in the coastal ocean, Nature, 437, 400-403, 2005 doi:10.1038/nature03936 (J.D. Nash and J.N. Moum) [pdf]
Differential diffusion in breaking Kelvin-Helmholtz billows, J. Phys. Oceanogr., 35, 1004-1022, 2005. (W.D. Smyth, J.D. Nash and J.N. Moum) [pdf]
Estimating Internal Wave Energy Fluxes in the Ocean, J. Atmos. and Oceanic Tech., 22(10), 1551-1570, 2005 (J.D. Nash, M.H. Alford and E. Kunze). [pdf]
Internal tide reflection and turbulent mixing on the continental slopeNash, J. Phys. Oceanogr. 34(5), 1117-1134, 2004 (J.D., E. Kunze, J. M. Toole and R. W. Schmitt) [pdf]
An examination of the radiative and dissipative properties of deep ocean internal tides, Deep Sea Research II , 51 , 3029-3042, 2004 (St. Laurent, L. C. and J. D. Nash) [pdf]
From tides to mixing along the Hawaiian Ridge, Science, 301, 355-357, 2003 (Experiment PIs including J.D. Nash) [pdf]
Observations of boundary mixing over the continental slope, J. Phys. Oceanogr., 32, 2113-2130, 2002. (J.N. Moum, D.R. Caldwell, J.D. Nash and G.D. Gunderson) [pdf]
Microstructure observations of turbulent salinity flux and the dissipation spectrum of salinity, J. Phys. Oceanogr., 2002, 32, 2312-2333 (J.D. Nash and J.N. Moum). [pdf]
Internal hydraulic flows on the continental shelf: high drag states over a small bank, J. Geophys. Res., 106, 4593-4611, 2001 (J.D. Nash and J.N. Moum) [pdf]
Topographically-induced drag and mixing at a small bank on the continental shelf, J. Phys. Oceanogr., 30, 2049-2054, 2000 (J.N. Moum and J.D. Nash) [pdf]
Estimating salinity variance dissipation rate from microstructure conductivity measurements, J. Oceanic Atmos. Technol., 16, 263-274 , 1999 (J.D. Nash and J.N. Moum) [pdf]
A thermocouple probe for high speed temperature measurements in the ocean, J. Oceanic Atmos. Technol., 16, 1474-1482, 1999 (J.D. Nash, D.R. Caldwell, M.J. Zelman and J.N. Moum) [pdf]
Buoyant surface discharges into unsteady ambient flows, Dynamics of Atmospheres and Oceans. 24, 1-4, pp. 75, 1996 (J.D. Nash and G.H. Jirka)
Large scale Planar Laser Induced Fluorescence in turbulent density-stratified flows, Experiments in Fluids. Volume 19, Number 5, pp 297, 1995 (J.D. Nash, G.H. Jirka and D. Chen)
Links:
- My curriculum vitae
- Complete publication list
- A short preliminary cruise report giving an overview of the dissipation measurements made by AVP during HOME 2000 (Nash, Sanford, Lee and Kunze) (link to pdf file)
- Assorted HOME figures (link to HOME directory)
Education:
B.Sc., Queen's University at Kingston, Ont. (Engineering Physics), 1991M.Sc., Cornell University (Environmental Engineering), 1995
Ph.D., Oregon State University (Physical Oceanography), May 2000