Advanced technologies for vertical sounding of stratified ocean environment. PT profiler

by

L.A. Krasnodubets1, 2

1 Sevastopol State University, RF, Sevastopol, Universitetskaya St., 33

2 Institute of Natural and Technical Systems, RF, Sevastopol, Gogol St., 14

  E-mail: lakrasno@gmail.com

DOI: 10.3375/2220-5861-2025-2-42-56

UDC 004.942

EDN: https://elibrary.ru/habyfnef

Abstract:     

The article summarizes the author’s series of works focused on the development and application of methodological support as an integral part of promising technologies for vertical profiling of the ocean thickness using marine autonomous probes. Mathematical models of the autonomous probe motion in the ocean stratified environment are developed. These models, which form the corresponding processes of the probe motion, are transformed into models of dynamic measurements, which makes it possible to form seawater density distributions based on direct measurements of its motion trajectory parameters or on the time series of hydrostatic pressure recorded during profiling. On this basis, a computationally efficient algorithmic support is proposed for the onboard information and measuring system operating in real time in accordance with the proposed basic method of dynamic measurements. In this case, the distributions of the main stratification characteristics are calculated in parallel. In the case of using the “baric” model, all distributions constructed during one probing are calculated based on direct measurements obtained from one pressure sensor. To expand the measurement base, the probe can be equipped with a standard temperature measuring channel. The result is a PT (Pressure Temperature) profiler, which compares favorably with the CTD profiler in that it has a smaller number of sensors, can operate without a temperature sensor, a measuring channel for electrical conductivity is not needed in principle, the distribution of seawater density is constructed during profiling by hydrostatic pressure and depth without using the TEOS-10 equation. Verification of models and algorithms is performed using computer modeling. Issues of accuracy assessment are considered.

Keywords: marine probe, seawater density, stratification characteristics, dynamic measurements, mathematical model

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REFERENCES

  1. Krasnodubets L.A., Zaburdayev V.I., and Al’chakov V.V. Upravleniye morskimi buyami-profilemerami kak metod povysheniya reprezentativnosti termokhalinnykh izmereniy. Sintez i modelirovaniye sistemy upravleniya (Control of sea buoys-profilers as a method of increasing the representativeness of thermohaline measurements. Synthesis and modeling of the control system. Morskoy gidrofizicheskiy zhurnal, 2012, No. 5, pp. 70–82
  2. World ocean circulation experiment. Requirements for WOCE hydrographic programme data reporting. WHP office report WHPO 90-1, WOCE report N67/91, 1991, Rev. 1, Woods Holl, Mass. USA, 71 p. unpublished manuscript.
  3. https://globalocean.noaa.gov/research/argo-program/ (May 20, 2025).
  4. Fedorov K.N. Tonkaya termokhalinnaya struktura vod okeana (Fine thermohaline structure of ocean waters), Leningrad: Gidrometeoizdat, 1976, 184 p.
  5. https://calcofi.com/index.php?option=com_content&view=article&id=445:ctd-data-algorithms&catid (May 12, 2025).
  6. https://www.teos-10.org (May 19, 2025).
  7. Arkhipkin V.S., and Dobrolyubov S.A. Okeanologiya. Fizicheskiye svoystva morskoy vody (Oceanology. Physical properties of sea water), Moscow: Izd-vo Yurayt, 2020, 216 p.
  8. Zhemkov Y.I. Metod i ustroystvo gidrostaticheskogo izmeritelya plotnosti morskoy vody (Method and device of hydrostatic density meter of sea water), Sovremennyye metody i sredstva okeanologicheskikh issledovaniy (Modern methods and means of oceanographic research), Proc. 12th International sci. tech. Conference, Part I, Moscow, 2011, pp. 95-97.
  9. Fedotov G.A. Novaya modifikatsiya gidrostaticheskogo metoda opredeleniya plotnosti morskoy vody (New modification of the hydrostatic method for determining the density of sea water). Fundamental’nyye problemy sovremennoy gidrodinamiki, 2013, Vol. 6, No. 1, pp. 58–65.
  10. Gaysky V.A.  Izmeritel’ plotnosti zhidkosti i yego varianty:  patent na izobreteniye RF № 2792263 (Liquid density meter and its variants: Russian Federation patent for invention No. 2792263. Opubl. 21.03.2023, No. 9.
  11. Krasnodubets L.A. Novyy podkhod k resheniyu zadach operativnogo analiza sostoyaniya vertikal’noy stratifikatsii vod okeanskoy sredy (A new approach to solving the problems of operational analysis of the vertical stratification state of ocean environment waters). Sistemy kontrolya okruzhayushchey sredy, 2023, No. 4 (54), pp. 25–33. DOI: 10.33075/2220-5861-2023-4-25-33
  12. Loytsyanskiy L.G. Mekhanika zhidkosti i gaza (Mechanics of liquid and gas). Moscow: Nauka, 1991, 600 p.
  13. Krasnodubets L.A. Metod opredeleniya vertikal’nogo profilya plotnosti morskoy vody na osnove izmereniy parametrov dvizheniya neupravlyayemogo avtonomnogo zonda (Method of determining the vertical profile of seawater density on the basis of measurements of the parameters of the movement of the uncontrollable autonomous probe). Sistemy kontrolya okruzhayushchey sredy, 2017, No. 10 (30), pp. 8–15.
  14. Krasnodubets L.A. Dinamicheskiye izmereniya v zadachakh operativnoy okeanologii pri issledovanii svoystv okeanskoy tolshchi (Dynamic measurements in the problems of operational oceanology in the study of the properties of the oceanic plate). Sistemy kontrolya okruzhayushchey sredy, 2022, No. 1 (47), pp. 56–65. DOI: 10.33075/2220-5861-2022-1-56-65
  15. Krasnodubets L.A. Operativnyy kontrol’ glubiny pogruzheniya avtonomnogo profilografa vo vremya zondirovaniya (Operational monitoring of the immersion depth of autonomous profiler during probing). Sistemy kontrolya okruzhayushchey sredy, 2024, No. 4 (58), pp. 38–46. DOI: 10.33075/2220-5861-2024-4-38-46
  16. Mamaev O.I. Morskaya turbulentnost’ (Marine turbulence), Moscow: Izd-vo MGU, 1970, 204 p.
  17. Paramonov A.N., Kushnir V.M., and Zaikin V.M. Avtomatizatsiya gidrofizicheskogo eksperimenta (Automation of hydrophysical experiment), Leningrad: Gidrometeoizdat, 1982, 224 p.
  18. Gaysky V.A. Metod opredeleniya glubiny pogruzheniya pribora v more pri zondirov (Method for determining the device immerssion depth in the sea during sounding). Sistemy kontrolya okruzhayushchey sredy, 2022, No. 4 (50), pp. 40–45. DOI: 10.33075/2220-5861-2022-4-40-45
  19. Krasnodubets L.A. Kontseptsiya primeneniya i modelirovaniye morskogo avtonomnogo smart profilografa (Concept of using and modeling of a marine autonomous smart profiler). Sistemy kontrolya okruzhayushchey sredy, 2020, No. 3 (41), pp. 106–113. DOI: 10.33075/2220-5861-2020-3-106-113
  20. Al’chakov V.V. Upravleniye morskimi podvizhnymi platformami sbora dannykh pri profil’nykh izmereniyakh: dis. … kand. tekhn. nauk (Control of marine mobile platforms for data collection during profile measurements. Cand. tech. sci. thesis), Sevastopol: СевНТУ, 2013, 140 p.

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