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Simulated ocean dynamics and lagrangian trajectory analysis in the Andaman Sea
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Lagrangian trajectory modeling of the Andaman Sea shows that monsoon-driven circulation controls seasonal particle retention near Sumatra and westward export into the Indian Ocean, with particle behavior strongly tied to monsoonal phase. These ocean transport dynamics are directly applicable to predicting how microplastics disperse across transboundary marine regions.
The Andaman Sea is a complex tropical basin significantly influenced by monsoonal forcing, which dictates regional circulation and water mass properties. This study utilizes a high-resolution (1/36º) CROCO ocean model and the Ichthyop Lagrangian tool to analyze circulation, thermohaline structure, and particle trajectories from 2015 to 2019. Findings indicate that monsoons drive substantial seasonal variability; the Northeast Monsoon promotes a northward flow of low-salinity water from the Malacca Strait, while the Southwest Monsoon facilitates saline Indian Ocean intrusion. Vertical analysis shows the thermocline fluctuating between 30 and 180 m, primarily influenced by Indian Ocean Dipole (IOD) events. EOF analysis revealed dominant annual periodicities of 341 days for temperature and salinity, while Lagrangian simulations identified particle retention along Sumatra during the Northeast Monsoon and westward export into the Indian Ocean during the Southwest Monsoon. Mean meridional volume transport was calculated at +0.32 Sv. These results provide a critical scientific basis for understanding regional biological connectivity and transboundary marine debris management in the Andaman region.
More Papers Like This
Simulated ocean dynamics and lagrangian trajectory analysis in the Andaman Sea
AI summary Read the abstract
A high-resolution ocean model and Lagrangian trajectory analysis of the Andaman Sea from 2015–2019 reveals that monsoon forcing drives seasonal particle retention near Sumatra and westward export into the Indian Ocean. These circulation dynamics are critical for predicting microplastic transport pathways and accumulation zones in this understudied but heavily trafficked tropical basin.
Marine Debris Pathway Across Indonesian Boundary Seas
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Lagrangian particle-tracking simulations modeled marine debris trajectories across Indonesian boundary seas, finding that complex ocean circulation patterns and monsoon seasonality strongly influence debris accumulation zones and cross-border transport in this archipelago region.
Monsoon-Driven Dispersal of River-Sourced Floating Marine Debris in Tropical Semi-Enclosed Waters: A Case Study in the Gulf of Thailand
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A 3D hydrodynamic and particle tracking model was used to simulate seasonal distribution of floating marine debris from 12 river mouths in the Gulf of Thailand, finding seasonal monsoon currents drive debris between eastern and western regions. The upper Gulf of Thailand accumulated the highest debris concentrations, with about 50% of released particles eventually stranding onshore.
Monsoonal influence on floating marine litter pathways in the Bay of Bengal
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This study used a particle tracking model to investigate source-to-sink connectivity of floating marine debris in the Bay of Bengal, finding that the vast majority of released particles beached within 16 months and most within their country of origin (57–90%), with Myanmar's coastline showing the second-highest connectivity rates from many countries. Connectivity patterns changed seasonally with the monsoon, and the post-monsoon period (October–January) showed notably greater particle dispersal, providing critical information for regional policy on marine plastic governance in the Bay of Bengal.
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