“Sigma-1” Measuring Complex for the Investigation of Small-Scale Characteristics of Hydrophysical Fields in the Upper Layer of the Sea

Samodurov, A. S.; Dykman, V. Z.; Barabash, V. A.; Efremov, O. I.; Zubov, A. G.; Pavlenko, O. I.; Chukharev, A. M.

doi:10.1007/s11110-006-0005-1

Cited by 14 publications

(7 citation statements)

References 1 publication

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“…In order to minimize the effect of the platform constructions on measurements, the equipment was placed on 4-6 m long beams, which extend out of the sea-looking side of the platform. In addition, characteristics of the ocean mixed layer turbulence were measured with the "Sigma-1" instrument, developed by MHI [ 16 ]. This instrument collects data with a high frequency.…”

Section: Instrumentation and Methodsmentioning

confidence: 99%

Air–sea interaction under low and moderate winds in the Black Sea coastal zone

Репина¹,

Artamonov²,

Chukharev³

et al. 2012

Estonian J. Eng.

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This paper reports the results of field experiments performed at an offshore oceanographic platform in the Black Sea during spring and fall seasons 2005-2011. Observations of the air-sea interaction were made using direct and remote sensing methods in the coastal zone where the interaction is complex and still poorly understood. A specialized research platform, managed by the Marine Hydrophysical Institute (MHI), is placed on the shelf slope approximately 600 m offshore the Crimea coast, Ukraine. The water depth at the site is about 30 m. The experiment program included conventional turbulence measurements with the eddy-covariance method as well as remote radio-polarimetric measurements with a newly developed instrument. The study was concentrated on the air-sea interaction during episodes of weak wind in the atmosphere and upwelling events in the ocean. Analysis of the collected data confirmed significant dependence of the surface drag coefficient on the air-sea temperature difference under weak wind conditions. However, this analysis also demonstrated a new air-sea interaction regime, which is characterized by large quasi-periodic (periods about 3.5 h) turbulence oscillations developing initially in the atmosphere and later (after about 10-12 h) in the sub-surface water layer. The analysis of radiopolarimetric measurements provided the characteristics of the gravity-capillary wave field during these events.

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Section: Instrumentation and Methodsmentioning

confidence: 99%

Air–sea interaction under low and moderate winds in the Black Sea coastal zone

Репина¹,

Artamonov²,

Chukharev³

et al. 2012

Estonian J. Eng.

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“…At the same time, standard weather observations were carried out: wind speed, temperature and humidity and so on. The Sigma-1 measuring complex [11] registers many parameters: 3D velocity fluctuations: temperature, electrical conductivity, pressure and their pulsation components, that make it possible to estimate the intensity of turbulence. Measurements are taken from the sea side with an appropriate range of flow directions in order to avoid the influence of the platform; the instruments are located at a sufficient distance from the supporting structures.…”

Section: Field Measurements Of Hydrophysical Characteristics In the Mmentioning

confidence: 99%

Identification of large turbulent structures from simultaneous field and satellite measurements

Chukharev¹,

Pavlenko²

2020

Sovr. Probl. DZZ Kosm.

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“…The measurements were carried out on the stationary oceanographic platform of the Black Sea Hydrophysical Polygon, RAS in Katsiveli (Crimea). A positional variant of the Sigma-1 measuring complex was used [18], the general view of which is shown in Fig. 1.…”

Section: In Situ Measurementsmentioning

confidence: 99%

Experimental Estimation of the Turbulent Energy Dissipation Rate in the Sea Subsurface Layer at Storm Conditions

Chukharev¹,

Zubov²,

Pavlenko³

2018

PhO

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Rate of the turbulent energy dissipation arising due to the breaking surface waves is estimated based on the experimental data on near-surface turbulence. The studies were carried out on the oceanographic platform in the Black Sea coastal zone by the specialized measuring complex "Sigma-1". To analyze the data, specific hydrometeorological conditions including high wind speed and significant number of breaking waves were chosen from the total data array. The turbulent energy dissipation rate per unit of volume ε is calculated using the spectra of velocity fluctuations based on the Kolmogorov hypotheses on the inertial-range spectrum of turbulence. The dissipation rate per unit of area of the sea surface is calculated by the over depth integrating the values of ε defined on all the measurement horizons with their extrapolation up to the surface and bottom. The results provided by the experimental data are compared to the wave energy losses due to breaking calculated by the Phillips model (1985). The values of the breaking parameter b calculated under the assumption on its model dependence upon the wave number are smaller than the estimates obtained by the other authors. The second method of calculation implies an assumption that the breaking parameter is constant in every single experiment and does not depend on the wave number. The obtained values of b are of moderate spread and also smaller (within one order of magnitude) than the estimates obtained by the other authors. In this case the values of b are satisfactorily approximated by the constant bc ≈ 1.31·10 -4 . Discrepancy between the obtained results and those in the other sources can be conditioned by the differing waves' characteristics and methods for estimating the dissipation rate.

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“Sigma-1” Measuring Complex for the Investigation of Small-Scale Characteristics of Hydrophysical Fields in the Upper Layer of the Sea

Cited by 14 publications

References 1 publication

Air–sea interaction under low and moderate winds in the Black Sea coastal zone

Air–sea interaction under low and moderate winds in the Black Sea coastal zone

Identification of large turbulent structures from simultaneous field and satellite measurements

Experimental Estimation of the Turbulent Energy Dissipation Rate in the Sea Subsurface Layer at Storm Conditions

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