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How Do Ocean Gyres Concentrate Plastic Waste Into Massive Patches?
海洋环流如何将塑料垃圾聚集成巨型垃圾带？
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Ocean gyres are large, slow-moving circular currents driven by wind patterns and Earth’s rotation.
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Five major subtropical gyres trap floating debris in their calm central zones called 'convergence zones'.
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Plastic fragments break down into microplastics but remain buoyant due to low density and surface tension.
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Current models show that over 80% of ocean plastic originates from land-based sources via rivers.
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The North Pacific Gyre hosts the largest accumulation zone, known informally as the Great Pacific Garbage Patch.
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Satellite tracking and drifting buoys help scientists map transport pathways and residence times.
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Marine organisms mistake microplastics for plankton, introducing toxins up the food chain.
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Cleanup efforts focus on intercepting riverborne waste before it reaches open ocean circulation.
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Biodegradable alternatives fail in seawater because salt and cold inhibit microbial breakdown.
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Oceanographers combine fluid dynamics simulations with field sampling to predict future accumulation hotspots.