Variation of flow properties during a collision event of two mesoscale eddies in the Gulf Stream region from numerical simulation SCIE SCOPUS KCI

Cited 3 time in WEB OF SCIENCE Cited 3 time in Scopus
Title
Variation of flow properties during a collision event of two mesoscale eddies in the Gulf Stream region from numerical simulation
Author(s)
Chang, Yeon S.; Park, Young-Gyu
KIOST Author(s)
Chang, Yeon S.(장연식)Park, Young Gyu(박영규)
Publication Year
2015-09
Abstract
The temporal variation of the flow structure and consequent mixing process during the collision of two counter-rotating mesoscale eddies are investigated by analyzing the HYbrid Coordinate Ocean Model simulation for the Gulf Stream region using Eulerian parameters-Okubo-Weiss parameters and horizontal kinetic energy (KE)-and Lagrangian parameters-finite-size Lyapunov exponent (FSLE) and relative dispersion coefficients (K (r) ). During the collision process, a transport barrier constructed by FSLE ridges develops between the two eddies and hyperbolic points are formed at both ends of the barrier. High values of the shear components of strain (> mean + standard deviation) are observed around the hyperbolic points, indicating possible deformation of the eddy. The magnitudes of spatially averaged KE and FSLE values increase (20% and 25%, respectively) during the collision as the flows around the main eddy become more energetic and dispersive. The Eulerian measures-the relative vorticity and the shear components of strain-show different temporal evolutions. The former does not significantly vary (3%) while the latter has a peak value (34%) at the time of maximum impact of the collision. In contrast, the Lagrangian measures show a similar pattern of temporal variations as both FSLE and K (r) values generally increase (25% and 35%, respectively) during the collision, which indicates increased mixing due to the collision.
ISSN
1738-5261
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2417
DOI
10.1007/s12601-015-0052-y
Bibliographic Citation
OCEAN SCIENCE JOURNAL, v.50, no.3, pp.567 - 579, 2015
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Subject
LAGRANGIAN COHERENT STRUCTURES; SIZE LYAPUNOV EXPONENTS; MEDITERRANEAN SEA; RELATIVE DISPERSION; TRANSPORT; MODEL
Keywords
mesoscale eddy collision; Eulerian and Lagrangian parameters; Okubo-Weiss parameter; finite-size Lyapunov exponent; relative dispersion
Type
Article
Language
English
Document Type
Article
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Related Researcher
Research Interests

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

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