Untitled

Lueck, Rolf G.; Wolk, Fabian; Yamazaki, Hidekatsu

doi:10.1023/a:1015837020019

Cited by 171 publications

(60 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The methodology for computing the dissipation rate from airfoils has a long history that is described in detail in the literature; Lueck et al (2002) give a comprehensive review. Considerable details of the analysis methodologies are described by the Rockland Scientific Technical Note 28 (available online at http://www.…”

Section: Dissipation Rate From Deep Microstructure Profilermentioning

confidence: 99%

Turbulent Mixing in a Deep Fracture Zone on the Mid-Atlantic Ridge

Clement

Thurnherr

Laurent

2017

Journal of Physical Oceanography

View full text Add to dashboard Cite

Midocean ridge fracture zones channel bottom waters in the eastern Brazil Basin in regions of intensified deep mixing. The mechanisms responsible for the deep turbulent mixing inside the numerous midocean fracture zones, whether affected by the local or the nonlocal canyon topography, are still subject to debate. To discriminate those mechanisms and to discern the canyon mean flow, two moorings sampled a deep canyon over and away from a sill/contraction. A 2-layer exchange flow, accelerated at the sill, transports 0.04-0.10-Sv (1 Sv [ 10 6 m 3 s 21) up canyon in the deep layer. At the sill, the dissipation rate of turbulent kinetic energy « increases as measured from microstructure profilers and as inferred from a parameterization of vertical kinetic energy. Cross-sill density and microstructure transects reveal an overflow potentially hydrauli-

show abstract

Section: Dissipation Rate From Deep Microstructure Profilermentioning

confidence: 99%

Turbulent Mixing in a Deep Fracture Zone on the Mid-Atlantic Ridge

Clement

Thurnherr

Laurent

2017

Journal of Physical Oceanography

View full text Add to dashboard Cite

show abstract

“…Additionally, the profilers have CTDs for measurements of temperature and salinity. Microstructure variance is estimated using spectral analysis over 1-m depth intervals of each profile record using methods well described in the literature (e.g., Schmitt et al 1988;Gregg 1999;Lueck et al 2002). No spectral corrections are done to the shear spectra, as the inertial subrange and dissipative roll-off were always well resolved.…”

Section: Observationsmentioning

confidence: 99%

Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage

Merrifield

Laurent

Owens

et al. 2016

Journal of Physical Oceanography

View full text Add to dashboard Cite

Direct measurements of oceanic turbulent parameters were taken upstream of and across Drake Passage, in the region of the Subantarctic and Polar Fronts. Values of turbulent kinetic energy dissipation rate « estimated by microstructure are up to two orders of magnitude lower than previously published estimates in the upper 1000 m. Turbulence levels in Drake Passage are systematically higher than values upstream, regardless of season. The dissipation of thermal variance x is enhanced at middepth throughout the surveys, with the highest values found in northern Drake Passage, where water mass variability is the most pronounced. Using the density ratio, evidence for double-diffusive instability is presented. Subject to double-diffusive physics, the estimates of diffusivity using the Osborn-Cox method are larger than ensemble statistics based on « and the buoyancy frequency.

show abstract

“…The shear probe voltage output is converted to shear using the known electronic constants, the sensitivity of the shear probe, and the flow past the sensors (see, e.g., Lueck et al 2002). The time derivatives are converted to spatial derivatives along the main axis of the instrument (along x 0 ), approximately equal to the along-path direction for small AOA.…”

Section: B Mrmentioning

confidence: 99%

Microstructure Measurements from an Underwater Glider in the Turbulent Faroe Bank Channel Overflow

Fer

Peterson

Ullgren

2014

Journal of Atmospheric and Oceanic Technology

View full text Add to dashboard Cite

Measurements of ocean microstructure are made in the turbulent Faroe Bank Channel overflow using a turbulence instrument attached to an underwater glider. Dissipation rate of turbulent kinetic energy « is measured using airfoil shear probes. A comparison is made between 152 profiles from dive and climb cycles of the glider during a 1-week mission in June 2012 and 90 profiles collected from the ship using a vertical microstructure profiler (VMP). Approximately one-half of the profiles are collocated. For 96% of the dataset, measurements are of high quality with no systematic differences between dives and climbs. The noise level is less than 5 3 10 211 W kg 21, comparable to the best microstructure profilers. The shear probe data are contaminated and unreliable at the turning depth of the glider and for U/u t , 20, where U is the flow past the sensor, u t 5 («/N) 1/2 is an estimate of the turbulent velocity scale, and N is the buoyancy frequency. Averaged profiles of « from the VMP and the glider agree to better than a factor of 2 in the turbulent bottom layer of the overflow plume, and beneath the stratified and sheared plume-ambient interface. The glider average values are approximately a factor of 3 and 9 times larger than the VMP values in the layers defined by the isotherms 38-68 and 68-98C, respectively, corresponding to the upper part of the interface and above. The discrepancy is attributed to a different sampling scheme and the intermittency of turbulence. The glider offers a noise-free platform suitable for ocean microstructure measurements.

show abstract

Untitled

Cited by 171 publications

References 59 publications

Turbulent Mixing in a Deep Fracture Zone on the Mid-Atlantic Ridge

Turbulent Mixing in a Deep Fracture Zone on the Mid-Atlantic Ridge

Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage

Microstructure Measurements from an Underwater Glider in the Turbulent Faroe Bank Channel Overflow

Contact Info

Product

Resources

About