Surface water exchanges in the Luzon Strait as inferred from Lagrangian coherent structures

Zheng, Zhehao; Zhuang, Wei; Hu, Jianyu; Wu, Zelun; Liu, Changjian

doi:10.1007/s13131-020-1677-y

Cited by 3 publications

(2 citation statements)

References 53 publications

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“…A fraction of water parcels lingering in the SCS also tend to aggregate towards the shedding RCLVs. Simultaneously, it is worth noting that a cold-core eddy forms on the southwestern side of the Luzon Strait [51,63], during this period, giving rise to a north-south eddy dipole structure with the shedding RCLVs, delaying the trapped water parcels into the shedding RCLVs. Eventually, all particles merge into the interior of the shedding RCLVs and move coherently towards the SCS.…”

Section: Features Of Shedding Rclv In the Luzon Straitmentioning

confidence: 97%

“…Recent studies have explored various aspects of RCLVs, including different time and spatial scales of global RCLV detection and mass transport estimation [47,58], chlorophyll convergence and divergence effects induced by RCLVs [59], and diffusivity estimation induced by RCLVs [60]. The Lagrangian approach has also been applied to estimate global ocean mixing intensity, elucidate water sources, and predict the movement of oceanic materials [61][62][63]. However, limited attention has been given to Lagrangian eddy characteristics in the active eddy zone of the NWP, and further clarification focusing on the relationship between Eulerian and Lagrangian eddies throughout their lifespans is required.…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Characteristics and Volume Transport of Lagrangian Eddies in the Northwest Pacific

Yuan,

2023

Remote Sensing

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Mesoscale eddies play a crucial role in the transport of mass, heat, salt and nutrients, exerting significant influence on ocean circulation patterns, biogeochemical processes and the global climate system. Based on Lagrangian-Averaged Vorticity Deviation (LAVD) method, this study applies 27 years (1993–2019) of geostrophic current velocity data to detect Rotationally Coherent Lagrangian Vortices (RCLVs) in the Northwest Pacific (NWP; 10°N–30°N, 115°E–155°E), with the spatiotemporal characteristics of Eulerian Sea Surface Height Eddies (SSH eddies) and RCLVs being compared. A higher number of SSH eddies and RCLVs can be observed in spring and winter, and their inter-annual variations are similar. SSH eddies show higher generation number and larger radius in the Subtropical Countercurrent region, while RCLVs occur more favorably in the ocean basin. The propagation speed distributions of both eddy types are nearly identical and decrease with increasing latitude. Due to the material coherent transport maintained by RCLVs within a finite time interval, the coherent cores of RCLVs are considerably smaller in scale as compared to those of SSH eddies. The average zonal transports induced by SSH eddies and RCLVs are estimated to be −0.82 Sv and −0.51 Sv (1 Sv = 106 m3/s), respectively. For non-overlapping SSH eddies with RCLVs, approximately 80% of the water within the eddy leaks out during the eddy’s lifespan. In the case of overlapping SSH eddies, the ratio of coherent water inside the eddy decreases with increasing radius, and the leakage rate is around 58%. Finally, an examination of 36 shedding RCLVs events from the Kuroshio near the Luzon Strait, which induce an average zonal transport of −0.14 Sv, reveals that 54% of the water within the shedding RCLVs originates from the Kuroshio.

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Section: Features Of Shedding Rclv In the Luzon Straitmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Characteristics and Volume Transport of Lagrangian Eddies in the Northwest Pacific

Yuan,

2023

Remote Sensing

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Fuzzy cluster analysis of water mass in the western Taiwan Strait in spring 2019

Hu,

Zhu,

Yang

et al. 2023

Acta Oceanol. Sin.

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Applications of Finite-Time Lyapunov Exponent in detecting Lagrangian Coherent Structures for coastal ocean processes: a review

Peng,

Xu,

Shao

et al. 2024

Front. Mar. Sci.

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Addressing the threats of climate change, pollution, and overfishing to marine ecosystems necessitates a deeper understanding of coastal and oceanic fluid dynamics. Within this context, Lagrangian Coherent Structures (LCS) emerge as essential tools for elucidating the complexities of marine fluid dynamics. Methods used to detect LCS include geometric, probabilistic, cluster-based and braid-based approaches. Advancements have been made to employ Finite-time Lyapunov Exponents (FTLE) to detect LCS due to its high efficacy, reliability and simplicity. It has been proven that the FTLE approach has provided invaluable insights into complex oceanic phenomena like shear, confluence, eddy formations, and oceanic fronts, which also enhanced the understanding of tidal-/wind-driven processes. Additionally, FTLE-based LCS were crucial in identifying barriers to contaminant dispersion and assessing pollutant distribution, aiding environmental protection and marine pollution management. FTLE-based LCS has also contributed significantly to understanding ecological interactions and biodiversity in response to environmental issues. This review identifies pressing challenges and future directions of FTLE-based LCS. Among these are the influences of external factors such as river discharges, ice formations, and human activities on ocean currents, which complicate the analysis of ocean fluid dynamics. While 2D FTLE methods have proven effective, their limitations in capturing the full scope of oceanic phenomena, especially in 3D environments, are evident. The advent of 3D LCS analysis has marked progress, yet computational demands and data quality requirements pose significant hurdles. Moreover, LCS extracted from FTLE fields involves establishing an empirical threshold that introduces considerable variability due to human judgement. Future efforts should focus on enhancing computational techniques for 3D analyses, integrating FTLE and LCS into broader environmental models, and leveraging machine learning to standardize LCS detection.

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Surface water exchanges in the Luzon Strait as inferred from Lagrangian coherent structures

Cited by 3 publications

References 53 publications

Spatiotemporal Characteristics and Volume Transport of Lagrangian Eddies in the Northwest Pacific

Spatiotemporal Characteristics and Volume Transport of Lagrangian Eddies in the Northwest Pacific

Fuzzy cluster analysis of water mass in the western Taiwan Strait in spring 2019

Applications of Finite-Time Lyapunov Exponent in detecting Lagrangian Coherent Structures for coastal ocean processes: a review

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