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Creator:: Moum, J. N. and Osborn, T. R.
Abstract:: A series of profiles of velocity microstructure along 152°E in the western North Pacific Ocean were collected in May–June 1982. Large, averaged turbulent dissipation rates, ϵ, found in the main thermocline (400 to 1000 m) were determined by a combination of large independent estimates of ϵ and a greater rate...
Resource Type:: Article

Creator:: Moum, J. N., Osborn, T. R., and Crawford, W. R.
Abstract:: Turbulence measurements from the central equatorial Pacific in February 1982 have been analyzed and compared to synoptic CTD and current velocity profiles and current meter data. These suggest considerably more time (if not space) variability than had previously been anticipated. Above 300 m at the equator the turbulence levels were...
Resource Type:: Article

Creator:: Moum, J. N., Caldwell, D. R., Paulson, C. A., Chereskin, T. V., and Regier, L. A.
Abstract:: A 3°N to 3°S transect of the equator at 140°15'W was made in November 1984. Vertical profiles of temperature, conductivity and turbulent dissipation were obtained at approximately 1 km intervals. Contrary to previous results, we found no obvious peak in dissipation either at the equator or clearly associated with the...
Resource Type:: Article

Creator:: Dillon, T. M., Moum, J. N., Chereskin, T. K., and Caldwell, D. R.
Abstract:: The conventional view of equatorial dynamics requires that the zonal equatorial wind stress be balanced, in the mean, by the vertical integral of “large-scale” terms, such as the zonal pressure gradient, mesoscale eddy flux, and mean advection, over the upper few hundred meters. It is usually presumed that the surface...
Resource Type:: Article

Creator:: Moum, J. N.
Abstract:: A method is described for measuring the vertical component of velocity fluctuations due to three-dimensional turbulence in the ocean from a freely falling microstructure profiler. The dynamic pressure measurement relies on a commercially available and very sensitive piezoresistive differential pressure transducer. At nominal profiler fall speeds of 0.9 m s⁻¹,...
Resource Type:: Article

Creator:: Moum, J. N.
Abstract:: Simultaneous measurements of vertical velocity fluctuations, w′, and temperature fluctuations, T′, on scales of three-dimensional turbulence yield a direct measure of the turbulent heat flux, J[subscript]q. The scales contributing most significantly to J[subscript]q are tens of centimeters or about 10 times larger than the scales contributing to the turbulent kinetic...
Resource Type:: Article

Creator:: Herbert, D., Moum, J. N., and Caldwell, D. R.
Abstract:: In spite of the effects of several form of temporal variability that tend to mask geographical patterns in turbulence intensity, our evidence indicates that the turbulence is enhanced above the equatorial undercurrent in comparison to latitudes north and south of it. This evidence consists of three meridional transects of micro-structure...
Resource Type:: Article

Creator:: Anis, A. and Moum, J. N.
Abstract:: Clear identification of the relatively weak superadiabatic potential temperature gradient in the ocean surface layer during convection has been made with the help of intensive vertical profiling measurements at an open-ocean site. In the surface layer the superadiabatic gradient, with a mean value of −1.8 × 10⁻⁴ K m⁻¹, was...
Resource Type:: Article

Creator:: Moum, J. N., Hebert, D., Paulson, C. A., and Caldwell, D. R.
Abstract:: High correlations between turbulent dissipation rates and high-wavenumber internal waves and the high values of turbulent dissipation associated with internal wave activity suggest that internal waves are the main direct source of mixing in the thermocline above the core of the Equatorial Undercurrent. An extensive dataset obtained using a microstructure...
Resource Type:: Article

Creator:: Hebert, D., Moum, J. N., Paulson, C. A., and Caldwell, D. R.
Abstract:: In the low Richardson number shear flow above the Pacific Equatorial Undercurrent, a single vertical microstructure profile intersected the overturning crest of a packet of high horizontal wavenumber waves. The observed dissipation rates within the overturning wave were so high that if they were representative of the volume-averaged rate, the...
Resource Type:: Article

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