Turbulent mixing and its contribution to the oxygen flux in the northwestern boundary current region of the Japan/East Sea, April–October 2015 SCIE SCOPUS

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Title
Turbulent mixing and its contribution to the oxygen flux in the northwestern boundary current region of the Japan/East Sea, April–October 2015
Author(s)
Ostrovskii, Alexander; Stepanov, Dmitry; Kaplunenko, Dmitry; Park, Jae-Hun; Park, Young Gyu; Tishchenko, P.
KIOST Author(s)
Park, Young Gyu(박영규)
Alternative Author(s)
박영규
Publication Year
2021-12
Abstract
The Japan/East Sea is well ventilated and is the most oxygen-rich region in the Pacific. However, quantitative estimates of the turbulent fluxes are missing due to a lack of observational data. To assess turbulent mixing, we employ data from the moored profiler Aqualog survey of April–October 2015 near the northwestern boundary of this region where the oxygen maximum is observed. The survey allowed observation of collocated depth profiles of conductivity, temperature, ocean current, and dissolved oxygen 8 times per day. The data were processed by using the Mixing (MX) Oceanographic Toolbox based on the fine-scale parameterization of turbulent dissipation. The dissipation rate, the eddy diffusivity and the diapycnal fluxes of heat, salt and oxygen are estimated in the depth range from 130 to 350 m throughout the profiler deployment period. The survey-averaged diffusivity increased with depth from 0.5 × 10−5 to 4.0 × 10−5 m2 s−1. The month-to-month variability in the mixing in the intermediate water is presented. Early in May 2015, a transition in mixing occurred from the winter regime with upward turbulent fluxes of both heat and salt to the summer regime with the downward mixing of heat. The turbulent mixing was elevated in June when large anticyclonic eddies passed the profiler mooring. The application of the eddy diffusivities to the profiler mooring oxygen data yields an average downward oxygen flux of roughly 8.6 mol m−2 month−1.
ISSN
0924-7963
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/41583
DOI
10.1016/j.jmarsys.2021.103619
Bibliographic Citation
Journal of Marine Systems, v.224, 2021
Publisher
Elsevier BV
Subject
Diffusion; Mixing; Mooring; Shock tubes; Surveys; Turbulent flow; Anticyclonic eddies; Boundary currents; Dissipation rates; Eddy Diffusivities; Intermediate waters; Observational data; Quantitative estimates; Turbulent dissipation; Dissolved oxygen
Type
Article
Language
English
Publisher
Elsevier BV
Related Researcher
Research Interests

ocean circulation,ocean mixing,marine debris,해양순환,해양혼합,해양부유물

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