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Spatial and Seasonal Characteristics of the Submesoscale Energetics in the Northwest Pacific Subtropical Ocean

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Publicado en:Journal of Marine Science and Engineering vol. 13, no. 9 (2025), p. 1691-1713
Autor principal: Fei Yunlong
Otros Autores: Zhang, Shaoqing, Wang, Kaidi, Yu Yangyang, Gao, Yang, Cui, Tong
Publicado:
MDPI AG
Materias:
Pacific Ocean
Luzon
Kinetic energy
Transition zone
Eddies
Seasonal variation
Datasets
Potential energy
Buoyancy
Baroclinic instability
Topography
Windows (computer programs)
Seasonal variations
Mesoscale eddies
Spring
Simulation
Spring (season)
Winter
Mesoscale phenomena
Dissipation
Ocean circulation
Seasonality
Barotropic mode
Environmental
Acceso en línea:Citation/Abstract
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Resumen:The spatial and seasonal characteristics of submesoscales in the Northwest Pacific Subtropical Ocean are thoroughly investigated here using a submesoscale-permitting model within a localized multiscale energetics framework, in which three scale windows termed background, mesoscale, and submesoscale are decomposed. It is found that submesoscale energetics are highly geographically inhomogeneous. In the Luzon Strait, baroclinic and barotropic instabilities are the primary mechanisms for generating submesoscale available potential energy (APE) and kinetic energy (KE), and they exhibit no significant seasonal variations. Although buoyancy conversion experiences pronounced seasonal cycles and serves as the main sink of submesoscale APE in winter and spring, its contribution to submesoscale KE is negligible. The major sinks of submesoscale KE are advection, horizontal pressure work, and dissipation. In the Western Boundary Current transition and Subtropical Countercurrent (STCC) interior open ocean zone, submesoscales undergo significant seasonality, with large magnitudes in winter and spring. In spring and winter, baroclinic instability dominates the generation of submesoscale APE via forward cascades, while KE is mainly energized by buoyancy conversion and dissipated by the residual term. Meanwhile, in summer and autumn, submesoscales are considerably weak. Additionally, submesoscale energetics in the Western Boundary Current transition zone are slightly greater than those in the STCC interior open ocean zone, which is attributed to the strengthened straining of the Western Boundary Current and mesoscale eddies.
ISSN:2077-1312
DOI:10.3390/jmse13091691
Fuente:Engineering Database