Turbulence Measurement with a Moored Instrument

Lueck, Rolf G.; Huang, Daniel; Newman, David J.

doi:10.1175/1520-0426(1997)014<0143:tmwami>2.0.co;2

Cited by 68 publications

(18 citation statements)

References 30 publications

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“…A one-of-a-kind device developed by Lueck et al (1997) saw limited though intriguing use in inland tidal channels on a mooring buoyantly suspended from the seafloor. Only a portion of the data could be saved from deployments in the early 1990s.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Thermal Variance Dissipation Rates from Moored and Profiling Instruments at the Equator

Perlin

Moum

2012

Journal of Atmospheric and Oceanic Technology

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As a quantitative test of moored mixing measurements using xpods, a comparison experiment was conducted at 08, 1408W in October-November 2008. The following three measurement elements were involved: (i) NOAA's Tropical Atmosphere Ocean (TAO) mooring with five xpods, (ii) a similar mooring 9 km away with seven xpods, and (iii) Chameleon turbulence profiles at an intermediate location.Dissipation rates of temperature variance and turbulent kinetic energy are compared. In all but 3 of 17 direct comparisons 15-day mean values of x T agreed within 95% bootstrap confidence limits computed with the conservative assumption that individual 1-min xpod averages and individual Chameleon profiles are independent. However, significant mean differences occur on 2-day averages. Averaging in time reduces the range (95%) in the observed differences at two locations from a factor of 17 at 1-day averaging time to less than a factor of 2 at 15 days, presumably reflecting the natural variability in both the turbulence and the smallscale fluid dynamics that lead to instability and turbulence.The motion of xpod on a mooring beneath a surface buoy is complex and requires a complete motion package to define in detail. However, perfect knowledge of the motion of the sensor tip is not necessary to obtain a reasonable measure of x T . A sampling test indicated that the most important motion sensor is a pressure sensor sampled rapidly enough to resolve the surface wave-induced motion.

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Section: Introductionmentioning

confidence: 99%

Comparison of Thermal Variance Dissipation Rates from Moored and Profiling Instruments at the Equator

Perlin

Moum

2012

Journal of Atmospheric and Oceanic Technology

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“…This is certainly the case in the FBC, but may not be entirely valid on the IFR, necessitating caution when interpreting results from the ridge. There are, however, examples of energy cascades observed in lower energy environments (Lueck et al 1997) and indications that Eq. (5) holds in regions of low -average dissipation containing individual energetic events (Peters et al 1995).…”

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confidence: 99%

Dissipation of Turbulent Kinetic Energy Inferred from Seagliders: An Application to the Eastern Nordic Seas Overflows

Beaird

Fer

Rhines

et al. 2012

Journal of Physical Oceanography

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Turbulent mixing is an important process controlling the descent rate, water mass modification, and volume transport augmentation due to entrainment in the dense overflows across the Greenland-Scotland Ridge. These overflows, along with entrained Atlantic waters, form a major portion of the North Atlantic Deep Water, which pervades the abyssal ocean. Three years of Seaglider observations of the overflows across the eastern Greenland-Scotland Ridge are leveraged to map the distribution of dissipation of turbulent kinetic energy on the Iceland-Faroe Ridge. A method has been applied using the finescale vertical velocity and density measurements from the glider to infer dissipation. The method, termed the large-eddy method (LEM), is compared with a microstructure survey of the Faroe Bank Channel (FBC). The LEM reproduces the patterns of dissipation observed in the microstructure survey, which vary over several orders of magnitude. Agreement between the inferred LEM and more direct microstructure measurements is within a factor of 2. Application to the 9432 dives that encountered overflow waters on the Iceland-Faroe Ridge reveals three regions of enhanced dissipation: one downstream of the primary FBC sill, another downstream of the secondary FBC sill, and a final region in a narrow jet of overflow along the Iceland shelf break.

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“…Microstructure profiler with a shear probe is a common method to collect ocean turbulence data. Lueck [3], [4]had reported a study of the first moored microstructure measurements which had used the shear probes and fast temperature sensors, but the instrument could only store band-averaged spectra and some reduced data because of the technical limitation. In 2013, Song and Sun [5] designed a mooring system based on turbulence measurement instruments which had implemented continuous measurement at a fixed level, but they collected limited turbulence data.…”

Section: Introductionmentioning

confidence: 99%

The design of ocean turbulence measurement with a Moored instrument

Luan

Liu

Wang

et al. 2015

OCEANS 2015 - Genova

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The newly designed Instrument MTMI (Moored Turbulence Measuring Instrument) developed by OUC (Ocean University of China) had been deployed in the South China Sea at 21° 09.900 N 117°42.031 E and succeed to collect time series for about 115 days in 250-m-deep water. According to the requirements of turbulence measurement, the mechanical design was developed for turbulence observation platform to achieve stability and good flow tracking. By analyzing the pitch varying with flow speed, the results suggested that the platform satisfies the requirements of stability. Then, the heading of instrument compared with the flow direction measured by RCM (Recording Current Meter), and the two groups of data matched well which showed that our platform has a good ability to track the vibration of the flow direction. Finally, the power spectrum curves of shear signals and the theoretical Nasmyth spectrum also matched well and the rate of turbulence dissipation are 10 -7 W kg -1 approximately. In general, instrument mechanics were rationally designed and MTMI provided a good observation platform for the long-term turbulence measurements.

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Turbulence Measurement with a Moored Instrument

Cited by 68 publications

References 30 publications

Comparison of Thermal Variance Dissipation Rates from Moored and Profiling Instruments at the Equator

Comparison of Thermal Variance Dissipation Rates from Moored and Profiling Instruments at the Equator

Dissipation of Turbulent Kinetic Energy Inferred from Seagliders: An Application to the Eastern Nordic Seas Overflows

The design of ocean turbulence measurement with a Moored instrument

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