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Filtering by: Has journal Journal of Fluid Mechanics Remove constraint Has journal: Journal of Fluid Mechanics Creator Moum, James N. Remove constraint Creator: Moum, James N. Decade 1990-1999 Remove constraint Decade: 1990-1999

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  • Enhancement of fronts by vertical mixing

    Creator:
    Dewey, Richard K. and Moum, James N.
    Abstract:
    Microstructure observations near upwelled fronts indicate considerable variation in the structure of vertical mixing across the frontal region. Observations of cool filaments off northern California indicate that within the cool (dense) core of filaments the raised pycnocline inhibits the penetration to middepths of surface-generated mixing. The microstructure profiles are used...
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    Enhancement of Fronts by Vertical Mixing JOURNAL OF

  • Energy-containing scales of turbulence in the ocean thermocline

    Creator:
    Moum, James N.
    Abstract:
    From measurements of the energy‐containing scales of turbulence in the ocean thermocline, two new formulations are examined: (1) an inviscid estimate for the viscous dissipation rate of turbulent kinetic energy and (2) a mixing length estimate for the turbulent heat flux. These formulations are tested using coincident measurements of the...
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    thermocline JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 101, NO. C6, PAGES 14,095-14,109, JUNE 15, 1996 Energy

  • Efficiency of mixing in the main thermocline

    Creator:
    Moum, James N.
    Abstract:
    Estimates of heat flux from direct measurements of vertical velocity-temperature fluctuation correlations have been obtained from vertical profiles through turbulent patches in the main thermocline. These have been compared to more indirect flux estimates derived from dissipation rates of turbulent kinetic energy and temperature variance. Because record lengths are limited...
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    Efficiency of mixing in the main thermocline JOURNAL OF

  • Dynamic instability of stratified shear flow in the upper equatorial Pacific

    Creator:
    Sun, Chaojiao, Smyth, William D., and Moum, James N.
    Abstract:
    The role of stratified shear instability in maintaining the deep cycle of turbulence immediately below the equatorial mixed layer is examined by means of linear stability analysis. The Taylor-Goldstein equation is solved numerically, using observed currents and stratification from the Tropical Instability Wave Experiment (TIWE). Multiple unstable modes are found,...
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    equatorial Pacific JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 103, NO. C5, PAGES 10,323-10,337, MAY 15, 1998

  • Microstructure activity within a minifilament in the Coastal Transition Zone

    Creator:
    Dewey, Richard K., Moum, James N., and Caldwell, Douglas R.
    Abstract:
    This paper presents observations of a dynamic minifilament and summarizes the findings of three microstructure surveys across and within the meandering current structures of the Coastal Transition Zone (CTZ). An actively turbulent minifilament is discussed and possible consequences of the small-scale processes with regard to frontal dynamics are examined. Four...
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    Transition Zone JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 98, NO. C8, PAGES 14,457-14,470, AUGUST 15, 1993

  • Structure and dynamics of a coastal filament

    Creator:
    Dewey, Richard K., Moum, James N., Paulson, Clayton A., Caldwell, Douglas R., and Pierce, Stephen D.
    Abstract:
    Repeated microstructure transects across filaments in the coastal transition zone (CTZ) have Revealed fundamental structure and dynamics of the complicated features. The measurements allow detailed momentum and vorticity analyses and provide a possible explanations for structural asymmetry of the fronts. Observations made between July 2 and July 23, 1988, along...
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    Structure and Dynamics of a Coastal Filament JOURNAL OF

  • Local ocean response to a multiphase westerly wind burst 2. Thermal and freshwater responses

    Creator:
    Smyth, William D., Hebert, D., and Moum, James N.
    Abstract:
    A westerly wind burst observed in the warm pool of the western equatorial Pacific Ocean cooled the ocean's surface layer by about 0.8°C. Turbulent entrainment at the base of this layer caused cooling but also heating due to the reversal of the vertical temperature gradient during rain events. Consequently, the...
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    . Thermal and freshwater responses JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 101, NO. C10, PAGES 22,513-22,533

  • Local ocean response to a multiphase westerly wind burst 1. Dynamic response

    Creator:
    Smyth, William D., Hebert, D., and Moum, James N.
    Abstract:
    The dynamic response to a westerly wind burst which occurred during the Couple Ocean Atmosphere Response Experiment in the warm pool of the equatorial Pacific Ocean is described using velocity, hydrography, and microstructure measurements. Turbulent fluxes distributed momentum input from the wind over a near-surface layer of variable thickness. Coriolis...
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    . Dynamic response JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 101, NO. C10, PAGES 22,495-22,512, OCTOBER 15