Thermochains of the Southern Branch, Shirshov Institute of Oceanology, Russian Academy of Sciences: Design, Methods, and Results of Metrological Investigations of Sensors

Ocherednik, V. V.; Баранов, В. И.; Зацепин, А. Г.; Kyklev, S. B.

doi:10.1134/s0001437018050090

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Thus, the diameter of the circle on the water surface determined by the antenna pattern is about 7.4 m. The antenna unit of the continuous channel is oriented at an angle of 5 degrees from the vertical. In continuous mode, the wave gauge emits a harmonic signal with a frequency of 200 kHz The multifunctional system also includes a stationary vertical profiling station [28] (SVSS in Figure 5b) and a thermochain [29]. Data are transmitted from the instruments to the data acquisition system unit and then via fiber-optic cable to the coastal computer, from where it can be downloaded via the Internet.…”

Section: Test Site and Instrumentsmentioning

confidence: 99%

Preliminary Performance Assessment of the Wave Parameter Retrieval Algorithm from the Average Reflected Pulse

Titchenko,

Jie,

Karaev

et al. 2024

Remote Sensing

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To obtain new information about surface waves, it is proposed to use an underwater acoustic wave gauge, and an assessment of its effectiveness can be performed using a numerical simulation and field experiment. A new device, an underwater acoustic wave gauge named “Kalmar”, was developed by the Institute of Applied Physics of the Russian Academy of Sciences for long-term, all-weather monitoring of wind waves. The instrument uses ultrasound to probe the water surface from underwater and can be used to verify remote sensing data. In this work, the capabilities of the device are tested and compared with ADCP data. Two independent methods for processing underwater acoustic wave gauge data are discussed and compared. One of them is completely new for acoustic measurements and is based on the analysis of the shape of the reflected acoustic pulse averaged over space and time. The other allows processing individual reflected pulses and calculating the time implementation of the distance to the water surface. It is shown that two independent methods of significant wave height retrieval from the acoustic wave gauge measurements are highly correlated. The “Kalmar” acoustic wave gauge and the RDI WH-600 acoustic Doppler current profiler operated simultaneously at the test site in Gelendzhik from 1 February to 10 February 2020. The significant wave heights measured by the two instruments are in good agreement.

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Section: Test Site and Instrumentsmentioning

confidence: 99%

Preliminary Performance Assessment of the Wave Parameter Retrieval Algorithm from the Average Reflected Pulse

Titchenko,

Jie,

Karaev

et al. 2024

Remote Sensing

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show abstract

“…Some interesting results were obtained at the hydrophysical polygon "Gelendzhik" Shirshov Institute of oceanology RAS [31]. Complex sonde Aqualog and thermistor chains were used for in situ measurements [32,33]. Thermistor chains were installed at different depths and provided data about seasonal temperature variations [33,34].…”

Section: Introductionmentioning

confidence: 99%

“…Complex sonde Aqualog and thermistor chains were used for in situ measurements [32,33]. Thermistor chains were installed at different depths and provided data about seasonal temperature variations [33,34]. Much more complete information about the spatiotemporal variability in the water temperature was obtained by using a cluster of three thermistor chains [34].…”

Section: Introductionmentioning

confidence: 99%

Water Structure in the Utrish Nature Reserve (Black Sea) during 2020–2021 According to Thermistor Chain Data

Silvestrova

Myslenkov

Puzina

et al. 2023

JMSE

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This paper reports the water temperature structure and associated coastal processes in the NE part of the Black Sea. In situ temperature was measured in the water area of the Utrish Nature Reserve. The thermistor chain was moored in 2020 and included 6–10 temperature sensors with an accuracy of ±0.025 °C and time step of one minute. The seasonal variations in the water temperature, upwelling events, internal waves and diurnal cycle were analyzed. The maximum value of SST (28.6 °C) was registered in the subsurface layer in August 2021; the minimum (7.7 °C) was registered in March 2022. Estimates of the diurnal temperature cycle were obtained according to spectral analysis. Summer months show the diurnal cycle more than 60% of the time, and the cold period shows it less than 10% of the time. Internal waves appeared in thermocline with periods from 5 min to 20 h. The strongest Ekman upwelling was registered in September 2021. The water temperature dropped from 26 °C to 16 °C in 10 h. Additionally, quality assessments of two hydrodynamic models were made. The models showed a good correlation (0.9) with water temperature measurements, but RMSE could reach 1–1.8 °C for subsurface layers. Temperature variability and its characteristics are an important basis for future coastal ecosystem studies in the Utrish.

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Examples of Approaches to Studying the Temperature Variability of Black Sea Shelf Waters with a Cluster of Temperature Sensor Chains

et al. 2020

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Thermochains of the Southern Branch, Shirshov Institute of Oceanology, Russian Academy of Sciences: Design, Methods, and Results of Metrological Investigations of Sensors

Cited by 6 publications

References 2 publications

Preliminary Performance Assessment of the Wave Parameter Retrieval Algorithm from the Average Reflected Pulse

Preliminary Performance Assessment of the Wave Parameter Retrieval Algorithm from the Average Reflected Pulse

Water Structure in the Utrish Nature Reserve (Black Sea) during 2020–2021 According to Thermistor Chain Data

Examples of Approaches to Studying the Temperature Variability of Black Sea Shelf Waters with a Cluster of Temperature Sensor Chains

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