Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 99395 10.2205/2025ES001064 trucuq ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Fine-Scale Measurements of Hydrophysical and Bio-Geo-Optical Properties by the Autonomous Moored Profiling Probe Winchi in the Waters of the Coastal Zone of the Northwestern Sea of Japan Fine-Scale Measurements of Hydrophysical and Bio-Geo-Optical Properties by the Autonomous Moored Profiling Probe Winchi in the Waters of the Coastal Zone of the Northwestern Sea of Japan https://orcid.org/0000-0002-3224-710X Салюк Павел Анатольевич Salyuk Pavel Anatol'evich pavel.salyuk@gmail.com https://orcid.org/0000-0002-2764-0740 Степанов Дмитрий Вадимович Stepanov Dmitriy Vadimovich https://orcid.org/0000-0002-8413-6030 Кочетов Олег Юрьевич Kochetov Oleg Yur'evich https://orcid.org/0000-0002-5906-0361 Островский Александр Григорьевич Ostrovskiy Aleksandr Grigor'evich https://orcid.org/0000-0001-5006-7754 Стёпочкин Игорь Евгениевич Stepochkin Igor' Evgenievich https://orcid.org/0000-0002-3177-4426 Липинская Надежда Александровна Lipinskaya Nadezhda Aleksandrovna https://orcid.org/0009-0001-0057-0869 Горбов Максим Иванович Gorbov Maksim Ivanovich https://orcid.org/0000-0002-9823-4491 Буланов Алексей Владимирович Bulanov Aleksey Vladimirovich https://orcid.org/0009-0008-8155-2304 Швоев Дмитрий Анатольевич Shvoev Dmitriy Anatol'evich https://orcid.org/0000-0003-4231-9653 Лазарюк Александр Юрьевич Lazaryuk Aleksandr Yur'evich https://orcid.org/0000-0003-0037-1568 Пивоваров Александр Анатольевич Pivovarov Aleksandr Anatol'evich https://orcid.org/0000-0002-5184-0718 Самченко Александр Николаевич Samchenko Aleksandr Nikolaevich https://orcid.org/0009-0006-0749-9037 Шмыков Никита Васильевич Shmykov Nikita Vasil'evich https://orcid.org/0009-0002-8341-2512 Иванченко Евгений Николаевич Ivanchenko Evgeniy Nikolaevich Тихоокеанский океанологический институт им. В.И.Ильичева Дальневосточного отделения РАН Vladivostok Россия V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch Vladivostok Russian Federation Институт океанологии имени П. П. Ширшова Moscow Россия Institute of Oceanology. PP Shirshov Russian Academy of Sciences Moscow Russian Federation 21 10 2025 21 10 2025 25 5 ES5015 15 06 2025 15 09 2025 https://rjes.ru/en/nauka/article/99395/view

In May–June 2024, an automatic mobile tethered Winchi profiler equipped with a YSI EXO2 Multiparameter Sonde was used to conduct fine-scale measurements of thermohaline stratification and bio-geo-optical parameters in Vityaz Bay (Peter the Great Bay, the Sea of Japan) for the first time. The data quality was improved by correcting the depth profiles of sea water temperature and absolute salinity to account for the response time of the temperature sensor, resulting in a reduction of the root-mean-square-error (RMSE) relative to reference profiles by factors of 5 and 6, respectively (final RMSE = 0.13◦C and 0.1 g/kg). The analysis revealed the presence of quasi-inertial (~18 hours) and diurnal (~24 hours) oscillations, as well as significant shifts in near-surface layer properties, through analysis of collocated thermohaline and bio-geo-optical data.

In May–June 2024, an automatic mobile tethered Winchi profiler equipped with a YSI EXO2 Multiparameter Sonde was used to conduct fine-scale measurements of thermohaline stratification and bio-geo-optical parameters in Vityaz Bay (Peter the Great Bay, the Sea of Japan) for the first time. The data quality was improved by correcting the depth profiles of sea water temperature and absolute salinity to account for the response time of the temperature sensor, resulting in a reduction of the root-mean-square-error (RMSE) relative to reference profiles by factors of 5 and 6, respectively (final RMSE = 0.13◦C and 0.1 g/kg). The analysis revealed the presence of quasi-inertial (~18 hours) and diurnal (~24 hours) oscillations, as well as significant shifts in near-surface layer properties, through analysis of collocated thermohaline and bio-geo-optical data.

 automatic underwater measurements vertical profiles real-time sensor inertia correction temporal variability quasi-inertial internal waves automatic underwater measurements vertical profiles real-time sensor inertia correction temporal variability quasi-inertial internal waves This study was partially supported by the POI FEB RAS Programs: No. 124022100080-0, No. 124022100072-5, No. 124042300003-5 and No. 125082509854-7. The contributions of A. Samchenko in carrying out the reference measurements, I. Stepochkin in measuring by Winchi profiler and D. Stepanov in analysing the thermohaline stratification were supported by Russian Science Foundation for Basic Research No. 25-17-20049. Testing and carrying out measurements was supported by the IO RAS assignment FMWE-2024-0024. This study was partially supported by the POI FEB RAS Programs: No. 124022100080-0, No. 124022100072-5, No. 124042300003-5 and No. 125082509854-7. The contributions of A. Samchenko in carrying out the reference measurements, I. Stepochkin in measuring by Winchi profiler and D. Stepanov in analysing the thermohaline stratification were supported by Russian Science Foundation for Basic Research No. 25-17-20049. Testing and carrying out measurements was supported by the IO RAS assignment FMWE-2024-0024.

Carlson D. F., Fredj E. and Gildor H. The annual cycle of vertical mixing and restratification in the Northern Gulf of Eilat/Aqaba (Red Sea) based on high temporal and vertical resolution observations // Deep Sea Research Part I: Oceanographic Research Papers. — 2014. — Vol. 84. — P. 1–17. — https://doi.org/10.1016/j.dsr.2013.10.004. Carlson D. F., Fredj E. and Gildor H. The annual cycle of vertical mixing and restratification in the Northern Gulf of Eilat/Aqaba (Red Sea) based on high temporal and vertical resolution observations // Deep Sea Research Part I: Oceanographic Research Papers. — 2014. — Vol. 84. — P. 1–17. — https://doi.org/10.1016/j.dsr.2013.10.004. Carstea E. M., Popa C. L., Baker A., et al. In situ fluorescence measurements of dissolved organic matter: A review // Science of The Total Environment. — 2020. — Vol. 699. — P. 134361. — https://doi.org/10.1016/j.scitotenv.2019.134361. Carstea E. M., Popa C. L., Baker A., et al. In situ fluorescence measurements of dissolved organic matter: A review // Science of The Total Environment. — 2020. — Vol. 699. — P. 134361. — https://doi.org/10.1016/j.scitotenv.2019.134361. Doherty K. W., Frye D. E., Liberatore S. P., et al. A Moored Profiling Instrument // Journal of Atmospheric and Oceanic Technology. — 1999. — Vol. 16, no. 11. — P. 1816–1829. — https://doi.org/10.1175/1520-0426(1999)016<1816:ampi>2.0.CO;2. Doherty K. W., Frye D. E., Liberatore S. P., et al. A Moored Profiling Instrument // Journal of Atmospheric and Oceanic Technology. — 1999. — Vol. 16, no. 11. — P. 1816–1829. — https://doi.org/10.1175/1520-0426(1999)016<1816:ampi>2.0.CO;2. Dunne J. P., Devol A. H. and Emerson S. The Oceanic Remote Chemical/Optical Analyzer (ORCA)-An Autonomous Moored Profiler // Journal of Atmospheric and Oceanic Technology. — 2002. — Vol. 19, no. 10. — P. 1709–1721. — https://doi.org/10.1175/1520-0426(2002)019<1709:torcoa>2.0.co;2. Dunne J. P., Devol A. H. and Emerson S. The Oceanic Remote Chemical/Optical Analyzer (ORCA)-An Autonomous Moored Profiler // Journal of Atmospheric and Oceanic Technology. — 2002. — Vol. 19, no. 10. — P. 1709–1721. — https://doi.org/10.1175/1520-0426(2002)019<1709:torcoa>2.0.co;2. Giles A. B. and McDougall T. J. Two methods for the reduction of salinity spiking of CTDs // Deep Sea Research Part A. Oceanographic Research Papers. — 1986. — Vol. 33, no. 9. — P. 1253–1274. — https://doi.org/10.1016/0198-0149(86)90023-3. Giles A. B. and McDougall T. J. Two methods for the reduction of salinity spiking of CTDs // Deep Sea Research Part A. Oceanographic Research Papers. — 1986. — Vol. 33, no. 9. — P. 1253–1274. — https://doi.org/10.1016/0198-0149(86)90023-3. Honeywell. Honeywell Pressure Sensor, MLH Series. — 2025. — URL: https://automation.honeywell.com/us/en/products/sensing-solutions/sensors/pressure-sensors/mlh-series?sku=MLH300PSL06A (visited on 06/15/2025). Honeywell. Honeywell Pressure Sensor, MLH Series. — 2025. — URL: https://automation.honeywell.com/us/en/products/sensing-solutions/sensors/pressure-sensors/mlh-series?sku=MLH300PSL06A (visited on 06/15/2025). Kolding J. and Sagstad B. Cable-free automatic profiling buoy // Sea Technology. — 2013. — Vol. 54. — P. 10–12. Kolding J. and Sagstad B. Cable-free automatic profiling buoy // Sea Technology. — 2013. — Vol. 54. — P. 10–12. Lazaryuk A. Yu. Response functions of the temperature and conductivity sensors of CTD profilers // Oceanology. — 2008. — Vol. 48, no. 6. — P. 872–875. — https://doi.org/10.1134/s0001437008060131. Lazaryuk A. Yu. Response functions of the temperature and conductivity sensors of CTD profilers // Oceanology. — 2008. — Vol. 48, no. 6. — P. 872–875. — https://doi.org/10.1134/s0001437008060131. Lochthofen N., Frommhold L., Ludszuweit J., et al. A Subsea Winched Profiling System (SWIPS) for Long-Term HighResolution Measurements in Ocean Surface Layers // Marine Technology Society Journal. — 2021. — Vol. 55, no. 2. — P. 165–171. — https://doi.org/10.4031/mtsj.55.2.3. Lochthofen N., Frommhold L., Ludszuweit J., et al. A Subsea Winched Profiling System (SWIPS) for Long-Term HighResolution Measurements in Ocean Surface Layers // Marine Technology Society Journal. — 2021. — Vol. 55, no. 2. — P. 165–171. — https://doi.org/10.4031/mtsj.55.2.3. Lucas A. J., Nash J. D., Pinkel R., et al. Adrift Upon a Salinity-Stratified Sea: A View of Upper-Ocean Processes in the Bay of Bengal During the Southwest Monsoon // Oceanography. — 2016. — Vol. 29, no. 2. — P. 134–145. — https://doi.org/10.5670/oceanog.2016.46. Lucas A. J., Nash J. D., Pinkel R., et al. Adrift Upon a Salinity-Stratified Sea: A View of Upper-Ocean Processes in the Bay of Bengal During the Southwest Monsoon // Oceanography. — 2016. — Vol. 29, no. 2. — P. 134–145. — https://doi.org/10.5670/oceanog.2016.46. McDougall T. and Barker P. Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox. — CSIRO Marine, Atmospheric Research, 2011. McDougall T. and Barker P. Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox. — CSIRO Marine, Atmospheric Research, 2011. McDougall T. J., Jackett D. R. and Millero F. J. An algorithm for estimating Absolute Salinity in the global ocean // Ocean Science Discussions. — 2009. — Vol. 6, no. 1. — P. 215–242. — https://doi.org/10.5194/osd-6-215-2009. McDougall T. J., Jackett D. R. and Millero F. J. An algorithm for estimating Absolute Salinity in the global ocean // Ocean Science Discussions. — 2009. — Vol. 6, no. 1. — P. 215–242. — https://doi.org/10.5194/osd-6-215-2009. Novotryasov V. V., Stepanov D. V. and Yaroshchuk I. O. Observations of internal undular bores on the Japan/East Sea shelf-coastal region // Ocean Dynamics. — 2016. — Vol. 66, no. 1. — P. 19–25. — https://doi.org/10.1007/s10236-015-0905-z. Novotryasov V. V., Stepanov D. V. and Yaroshchuk I. O. Observations of internal undular bores on the Japan/East Sea shelf-coastal region // Ocean Dynamics. — 2016. — Vol. 66, no. 1. — P. 19–25. — https://doi.org/10.1007/s10236-015-0905-z. Ostrovskii A., Stepanov D., Kaplunenko D., et al. Turbulent mixing and its contribution to the oxygen flux in the northwestern boundary current region of the Japan/East Sea, April-October 2015 // Journal of Marine Systems. — 2021. — Vol. 224. — P. 103619. — https://doi.org/10.1016/j.jmarsys.2021.103619. Ostrovskii A., Stepanov D., Kaplunenko D., et al. Turbulent mixing and its contribution to the oxygen flux in the northwestern boundary current region of the Japan/East Sea, April-October 2015 // Journal of Marine Systems. — 2021. — Vol. 224. — P. 103619. — https://doi.org/10.1016/j.jmarsys.2021.103619. Ostrovskii A. G., Emelianov M. V., Kochetov O. Yu., et al. Automated Tethered Profiler for Hydrophysical and Bio-Optical Measurements in the Black Sea Carbon Observational Site // Journal of Marine Science and Engineering. — 2022. — Vol. 10, no. 3. — P. 322. — https://doi.org/10.3390/jmse10030322. Ostrovskii A. G., Emelianov M. V., Kochetov O. Yu., et al. Automated Tethered Profiler for Hydrophysical and Bio-Optical Measurements in the Black Sea Carbon Observational Site // Journal of Marine Science and Engineering. — 2022. — Vol. 10, no. 3. — P. 322. — https://doi.org/10.3390/jmse10030322. Ostrovskii A. G., Zatsepin A. G., Soloviev V. A., et al. Autonomous system for vertical profiling of the marine environment at a moored station // Oceanology. — 2013. — Vol. 53, no. 2. — P. 233–242. — https://doi.org/10.1134/s0001437013020124. Ostrovskii A. G., Zatsepin A. G., Soloviev V. A., et al. Autonomous system for vertical profiling of the marine environment at a moored station // Oceanology. — 2013. — Vol. 53, no. 2. — P. 233–242. — https://doi.org/10.1134/s0001437013020124. Park Y. G., Seo S., Kim D. G., et al. Coastal Observation Using a Vertical Profiling System at the Southern Coast of Korea // Frontiers in Marine Science. — 2021. — Vol. 8. — P. 668733. — https://doi.org/10.3389/fmars.2021.668733. Park Y. G., Seo S., Kim D. G., et al. Coastal Observation Using a Vertical Profiling System at the Southern Coast of Korea // Frontiers in Marine Science. — 2021. — Vol. 8. — P. 668733. — https://doi.org/10.3389/fmars.2021.668733. Pfannkuche J. and Schmidt A. Determination of suspended particulate matter concentration from turbidity measurements: particle size effects and calibration procedures // Hydrological Processes. — 2003. — Vol. 17, no. 10. — P. 1951– 1963. — https://doi.org/10.1002/hyp.1220. Pfannkuche J. and Schmidt A. Determination of suspended particulate matter concentration from turbidity measurements: particle size effects and calibration procedures // Hydrological Processes. — 2003. — Vol. 17, no. 10. — P. 1951– 1963. — https://doi.org/10.1002/hyp.1220. Pinkel R., Goldin M. A., Smith J. A., et al. The Wirewalker: A Vertically Profiling Instrument Carrier Powered by Ocean Waves // Journal of Atmospheric and Oceanic Technology. — 2011. — Vol. 28, no. 3. — P. 426–435. — https://doi.org/10.1175/2010jtecho805.1. Pinkel R., Goldin M. A., Smith J. A., et al. The Wirewalker: A Vertically Profiling Instrument Carrier Powered by Ocean Waves // Journal of Atmospheric and Oceanic Technology. — 2011. — Vol. 28, no. 3. — P. 426–435. — https://doi.org/10.1175/2010jtecho805.1. Poulain P. M. Unveiling near-inertial wave dynamics and storm-driven currents: Insights from moorings in the coastal Mediterranean Sea // Continental Shelf Research. — 2024. — Vol. 282. — P. 105321. — https://doi.org/10.1016/j.csr.2024.105321. Poulain P. M. Unveiling near-inertial wave dynamics and storm-driven currents: Insights from moorings in the coastal Mediterranean Sea // Continental Shelf Research. — 2024. — Vol. 282. — P. 105321. — https://doi.org/10.1016/j.csr.2024.105321. RBR Ltd. RBRconcerto and RBRduo instruments. — 2025. — URL: https://rbr-global.com/products/standardloggers/rbrduo-ct/ (visited on 06/15/2025). RBR Ltd. RBRconcerto and RBRduo instruments. — 2025. — URL: https://rbr-global.com/products/standardloggers/rbrduo-ct/ (visited on 06/15/2025). Send U., Fowler G., Siddall G., et al. SeaCycler: A Moored Open-Ocean Profiling System for the Upper Ocean in Extended Self-Contained Deployments // Journal of Atmospheric and Oceanic Technology. — 2013. — Vol. 30, no. 7. — P. 1555–1565. — https://doi.org/10.1175/jtech-d-11-00168.1. Send U., Fowler G., Siddall G., et al. SeaCycler: A Moored Open-Ocean Profiling System for the Upper Ocean in Extended Self-Contained Deployments // Journal of Atmospheric and Oceanic Technology. — 2013. — Vol. 30, no. 7. — P. 1555–1565. — https://doi.org/10.1175/jtech-d-11-00168.1. Shvoev D. A., Kochetov O. Yu., Volkov S. V., et al. The autonomous tethered profiler Winchi // Podvodnye issledovaniia i robototehnika. — 2024. — Vol. 50, no. 4. — P. 67–77. — https://doi.org/10.37102/1992-4429_2024_50_04_07. — (In Russian). Shvoev D. A., Kochetov O. Yu., Volkov S. V., et al. The autonomous tethered profiler Winchi // Podvodnye issledovaniia i robototehnika. — 2024. — Vol. 50, no. 4. — P. 67–77. — https://doi.org/10.37102/1992-4429_2024_50_04_07. — (In Russian). Stepanov D., Ostrovskii A., Ryzhov E., et al. Shear-driven vertical mixing and turbulent exchange over the continental slope in the northwestern Sea of Japan // Ocean Dynamics. — 2024. — Vol. 74, no. 11/12. — P. 919–934. — https://doi.org/10.1007/s10236-024-01639-2. Stepanov D., Ostrovskii A., Ryzhov E., et al. Shear-driven vertical mixing and turbulent exchange over the continental slope in the northwestern Sea of Japan // Ocean Dynamics. — 2024. — Vol. 74, no. 11/12. — P. 919–934. — https://doi.org/10.1007/s10236-024-01639-2. Stepanov D. V., Ostrovskii A. G. and Lazaryuk A. Yu. Diapycnal Mixing and Double Diffusion over the Continental Slope in the Northern Sea of Japan in the Warm Half-Year // Izvestiya, Atmospheric and Oceanic Physics. — 2023. — Vol. 59, no. 5. — P. 572–582. — https://doi.org/10.1134/S0001433823050109. Stepanov D. V., Ostrovskii A. G. and Lazaryuk A. Yu. Diapycnal Mixing and Double Diffusion over the Continental Slope in the Northern Sea of Japan in the Warm Half-Year // Izvestiya, Atmospheric and Oceanic Physics. — 2023. — Vol. 59, no. 5. — P. 572–582. — https://doi.org/10.1134/S0001433823050109. Wijesekera H. W., Jarosz E., Wang D. W., et al. Tidally Driven Mixing "Hot Spot" at the Entrance of the Japan/East Sea // Geophysical Research Letters. — 2022. — Vol. 49, no. 18. — e2022GL100315. — https://doi.org/10.1029/2022gl100315. Wijesekera H. W., Jarosz E., Wang D. W., et al. Tidally Driven Mixing "Hot Spot" at the Entrance of the Japan/East Sea // Geophysical Research Letters. — 2022. — Vol. 49, no. 18. — e2022GL100315. — https://doi.org/10.1029/2022gl100315. Xiao S., Zhang M., Liu C., et al. CTD Sensors for Ocean Investigation Including State of Art and Commercially Available // Sensors. — 2023. — Vol. 23, no. 2. — P. 586. — https://doi.org/10.3390/s23020586. Xiao S., Zhang M., Liu C., et al. CTD Sensors for Ocean Investigation Including State of Art and Commercially Available // Sensors. — 2023. — Vol. 23, no. 2. — P. 586. — https://doi.org/10.3390/s23020586. Yaroshchuk I., Kosheleva A., Lazaryuk A., et al. Estimation of Seawater Hydrophysical Characteristics from Thermistor Strings and CTD Data in the Sea of Japan Shelf Zone // Journal of Marine Science and Engineering. — 2023. — Vol. 11, no. 6. — P. 1204. — https://doi.org/10.3390/jmse11061204. Yaroshchuk I., Kosheleva A., Lazaryuk A., et al. Estimation of Seawater Hydrophysical Characteristics from Thermistor Strings and CTD Data in the Sea of Japan Shelf Zone // Journal of Marine Science and Engineering. — 2023. — Vol. 11, no. 6. — P. 1204. — https://doi.org/10.3390/jmse11061204. Yaroshchuk I. O., Leont’ev A. P., Kosheleva A. V., et al. On intense internal waves in the coastal zone of the Peter the Great Bay (the Sea of Japan) // Russian Meteorology and Hydrology. — 2016. — Vol. 41, no. 9. — P. 629–634. — https://doi.org/10.3103/s1068373916090053. Yaroshchuk I. O., Leont’ev A. P., Kosheleva A. V., et al. On intense internal waves in the coastal zone of the Peter the Great Bay (the Sea of Japan) // Russian Meteorology and Hydrology. — 2016. — Vol. 41, no. 9. — P. 629–634. — https://doi.org/10.3103/s1068373916090053. YSI Inc. EXO fDOM (fluorescence of Dissolved Organic Matter) Smart Sensor. — 2025a. — URL: https://www.ysi.com/product/id-599104-01/exo-fdom-smart-sensor (visited on 06/15/2025). YSI Inc. EXO fDOM (fluorescence of Dissolved Organic Matter) Smart Sensor. — 2025a. — URL: https://www.ysi.com/product/id-599104-01/exo-fdom-smart-sensor (visited on 06/15/2025). YSI Inc. EXO Turbidity Smart Sensor. — 2025b. — URL: https://www.ysi.com/product/id-599101-01/exo-turbiditysmart-sensor (visited on 06/15/2025). YSI Inc. EXO Turbidity Smart Sensor. — 2025b. — URL: https://www.ysi.com/product/id-599101-01/exo-turbiditysmart-sensor (visited on 06/15/2025). YSI Inc. EXO WipedCT (Wiped Conductivity & Temperature) Sensor. — 2025c. — URL: https://www.ysi.com/WipedCT (visited on 06/15/2025). YSI Inc. EXO WipedCT (Wiped Conductivity & Temperature) Sensor. — 2025c. — URL: https://www.ysi.com/WipedCT (visited on 06/15/2025). YSI Inc. EXO2 Multiparameter Sonde. — 2025d. — URL: https://www.ysi.com/exo2 (visited on 06/15/2025). YSI Inc. EXO2 Multiparameter Sonde. — 2025d. — URL: https://www.ysi.com/exo2 (visited on 06/15/2025).