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Global atmospheric distribution of microplastics with evidence of low oceanic emissions
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This study used atmospheric modeling to estimate the global distribution of airborne microplastics, finding that land-based sources like roads, agriculture, and cities contribute far more to atmospheric microplastics than ocean emissions. The model, validated against real-world observations, suggests that ocean contributions are about 10,000 times lower than previously estimated. Understanding where airborne microplastics come from is important because inhalation is a major route of human exposure.
Abstract Recent investigations based on sea–air transfer physical mechanistic studies suggest that the global ocean’s contribution to atmospheric microplastic emissions is significantly lower (four orders of magnitude) than previously estimated. However, no atmospheric models or observations have yet validated this lower emission flux, leaving the analysis without adequate validation and practical significance. Here, we provide quantitative estimates of the global atmospheric microplastic budget based on this reduced oceanic flux. Our model aligns well with observed atmospheric microplastic concentrations and suggests that the ocean functions more as a sink than a source, contributing only ~0.008% of global emissions but accounting for ~15% of total deposition. This challenges the previous view of the ocean as the primary atmospheric microplastic source, urging a reassessment of pollution mitigation strategies.
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Data of “Global atmospheric distribution of microplastics with evidence of low oceanic emissions”
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Scientists modeled how tiny plastic particles spread through the atmosphere worldwide, and found that most airborne microplastics likely come from land sources like roads and dust, not the ocean as previously thought. This matters because it means the air we breathe, potentially containing inhalable plastic particles, is shaped more by human activity on land, which could help target where to reduce pollution.
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Data of “Global atmospheric distribution of microplastics with evidence of low oceanic emissions”
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