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Distribution of small plastic fragments floating in the western Pacific Ocean from 2000 to 2001
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Researchers sampled plastic fragments floating in the western Pacific Ocean from 2000 to 2001, finding the highest concentrations in subtropical regions between 20-30 degrees latitude south and north of the equator. The study provides early baseline data on the distribution of small floating plastic in Pacific surface waters before the problem received widespread scientific attention.
Sampling was conducted at 31 sites in the western Pacific Ocean from 2000 to 2001 with the aim of collecting plastic fragments with a neuston net (mesh size 1.00 mm × 1.64 mm). Small plastic fragments including microplastics (small fragments in the size range of 1.1–41.8 mm) were collected at multiple survey sites. Waters with high densities of small fragments were observed between 20°N and 30°N to the south of Japan and between 20S and 30S to the northeast of New Zealand (maxima of 6.63 × 102 and 2.03 × 102 pieces/ha, respectively). These waters are located to the west of the Ekman convergence zones related to trade winds in the subtropical gyres of the North and South Pacific Oceans. Nearly no small plastics were observed in the tropical circulation of the western Pacific Ocean.
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Researchers surveyed microplastic abundance, distribution, and composition across the mid-west Pacific Ocean, an area with previously limited data, finding widespread contamination across sampled stations. The dominant particle types were fibers and fragments, with concentrations varying by location and depth.
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This study used surface trawl sampling across the eastern North Pacific to map floating microplastic distribution, finding highly variable concentrations with some areas nearly free of plastic despite proximity to the garbage patch. The results suggest that ocean circulation patterns create complex and shifting patterns of microplastic accumulation rather than a simple concentrated gyre.
A global inventory of small floating plastic debris
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Researchers compiled a global inventory of small floating plastic debris from ocean surface sampling expeditions, estimating the total abundance and mass of floating microplastics and identifying the major oceanic accumulation zones.
Scales of Spatial Heterogeneity of Plastic Marine Debris in the Northeast Pacific Ocean
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Researchers conducted a systematic assessment of plastic debris spatial heterogeneity across the North Pacific Subtropical Gyre, finding that plastic abundance varied over multiple spatial scales and was not uniformly distributed within the 'Great Pacific Garbage Patch' as popularly portrayed. Debris concentrations were patchy at fine scales and showed no simple relationship with surface current convergence zones.
Distribution of Surface Plastic Debris in the Eastern Pacific Ocean from an 11-Year Data Set
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Analysis of over 2,500 plankton net tows in the eastern Pacific Ocean from 2001 to 2012 documented a persistent plastic accumulation zone in the North Pacific subtropical gyre corresponding to the predicted convergence zone of ocean currents. The 11-year dataset reveals the long-term stability of this "garbage patch" and its distinct seasonal and interannual variability.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.