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MicroRiYo: An Observing System for Deep Repeated Profiles of Kinetic Energy Dissipation Rates from Shear-Microstructure Turbulence along a Mooring Line

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Title: MicroRiYo: An Observing System for Deep Repeated Profiles of Kinetic Energy Dissipation Rates from Shear-Microstructure Turbulence along a Mooring Line
Authors: Ferron, Bruno, Leizour, Stephane, Hamon, Michel, Peden, Olivier
Contributors: POTHIER, Nathalie
Source: Journal Of Atmospheric And Oceanic Technology (0739-0572) (American Meteorological Society), 2025-04, Vol. 42, N. 4, P. 387-399
Publisher Information: American Meteorological Society, 2025.
Publication Year: 2025
Subject Terms: Turbulence, Oceanic profilers, [SDU] Sciences of the Universe [physics], In situ oceanic observations, 0207 environmental engineering, 02 engineering and technology, Kinetic energy, 01 natural sciences, Instrumentation/sensors, Diapycnal mixing, 0105 earth and related environmental sciences
Description: A new observing system that provides deep repeated profiles of the oceanic kinetic energy dissipation rate and small-scale mixing is presented. The system is designed to provide 300 dissipation rate profiles using a vehicle that cycles along a mooring line from the subsurface down to a maximum depth of 4000 m. The system was tested for 2 weeks between 630 and 1700 m during a cruise that took place on the Lucky Strike segment of the Mid-Atlantic Ridge. The vehicle collected 35 profiles at a mean downcast velocity of 0.63 m s−1. To quantify the quality of the measurements, profiles from the mooring are compared with nearby profiles from an autonomous microstructure free-falling instrument. The dissipation rate noise level varies between O(10−10) and O(10−9) W kg−1. This noise level is low enough to detect turbulent patches at depth. The largest dissipation rate measured at this site was O(10−7) W kg−1. Significance Statement Understanding how the ocean dissipates the energy it receives from astronomical and atmospheric forcing (tides, heat, freshwater, wind) is a key element of ocean dynamics. Here, we present a new observing system that allows repeated measurements of the dissipation of kinetic energy in the ocean from the subsurface down to 4000 m at a given geographical point. Three hundred profiles can be measured, providing insights into the dynamics responsible for energy dissipation and tracer mixing. This observing system is particularly suited to the deep open ocean, where such observations remain scarce.
Document Type: Article
Other literature type
File Description: application/pdf
ISSN: 1520-0426
0739-0572
DOI: 10.1175/jtech-d-24-0009.1
Access URL: https://insu.hal.science/insu-05101553v1
https://doi.org/10.1175/jtech-d-24-0009.1
https://archimer.ifremer.fr/doc/00928/104005/115993.pdf
https://archimer.ifremer.fr/doc/00928/104005/
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  Data: MicroRiYo: An Observing System for Deep Repeated Profiles of Kinetic Energy Dissipation Rates from Shear-Microstructure Turbulence along a Mooring Line
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  Data: <searchLink fieldCode="AR" term="%22Ferron%2C+Bruno%22">Ferron, Bruno</searchLink><br /><searchLink fieldCode="AR" term="%22Leizour%2C+Stephane%22">Leizour, Stephane</searchLink><br /><searchLink fieldCode="AR" term="%22Hamon%2C+Michel%22">Hamon, Michel</searchLink><br /><searchLink fieldCode="AR" term="%22Peden%2C+Olivier%22">Peden, Olivier</searchLink>
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  Data: POTHIER, Nathalie
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  Data: Journal Of Atmospheric And Oceanic Technology (0739-0572) (American Meteorological Society), 2025-04, Vol. 42, N. 4, P. 387-399
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  Data: <searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink><br /><searchLink fieldCode="DE" term="%22Oceanic+profilers%22">Oceanic profilers</searchLink><br /><searchLink fieldCode="DE" term="%22[SDU]+Sciences+of+the+Universe+[physics]%22">[SDU] Sciences of the Universe [physics]</searchLink><br /><searchLink fieldCode="DE" term="%22In+situ+oceanic+observations%22">In situ oceanic observations</searchLink><br /><searchLink fieldCode="DE" term="%220207+environmental+engineering%22">0207 environmental engineering</searchLink><br /><searchLink fieldCode="DE" term="%2202+engineering+and+technology%22">02 engineering and technology</searchLink><br /><searchLink fieldCode="DE" term="%22Kinetic+energy%22">Kinetic energy</searchLink><br /><searchLink fieldCode="DE" term="%2201+natural+sciences%22">01 natural sciences</searchLink><br /><searchLink fieldCode="DE" term="%22Instrumentation%2Fsensors%22">Instrumentation/sensors</searchLink><br /><searchLink fieldCode="DE" term="%22Diapycnal+mixing%22">Diapycnal mixing</searchLink><br /><searchLink fieldCode="DE" term="%220105+earth+and+related+environmental+sciences%22">0105 earth and related environmental sciences</searchLink>
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  Data: A new observing system that provides deep repeated profiles of the oceanic kinetic energy dissipation rate and small-scale mixing is presented. The system is designed to provide 300 dissipation rate profiles using a vehicle that cycles along a mooring line from the subsurface down to a maximum depth of 4000 m. The system was tested for 2 weeks between 630 and 1700 m during a cruise that took place on the Lucky Strike segment of the Mid-Atlantic Ridge. The vehicle collected 35 profiles at a mean downcast velocity of 0.63 m s−1. To quantify the quality of the measurements, profiles from the mooring are compared with nearby profiles from an autonomous microstructure free-falling instrument. The dissipation rate noise level varies between O(10−10) and O(10−9) W kg−1. This noise level is low enough to detect turbulent patches at depth. The largest dissipation rate measured at this site was O(10−7) W kg−1. Significance Statement Understanding how the ocean dissipates the energy it receives from astronomical and atmospheric forcing (tides, heat, freshwater, wind) is a key element of ocean dynamics. Here, we present a new observing system that allows repeated measurements of the dissipation of kinetic energy in the ocean from the subsurface down to 4000 m at a given geographical point. Three hundred profiles can be measured, providing insights into the dynamics responsible for energy dissipation and tracer mixing. This observing system is particularly suited to the deep open ocean, where such observations remain scarce.
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        Value: 10.1175/jtech-d-24-0009.1
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      – SubjectFull: Turbulence
        Type: general
      – SubjectFull: Oceanic profilers
        Type: general
      – SubjectFull: [SDU] Sciences of the Universe [physics]
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      – SubjectFull: In situ oceanic observations
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      – TitleFull: MicroRiYo: An Observing System for Deep Repeated Profiles of Kinetic Energy Dissipation Rates from Shear-Microstructure Turbulence along a Mooring Line
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