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Microplastic volumes in Tokyo Bay
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Researchers quantified microplastic volumes across multiple sites in Tokyo Bay, Japan, finding spatial variation linked to urban runoff and river inputs, with surface waters and sediments showing distinct accumulation patterns.
Microplastic (MP) pollution is a rising environmental concern. This study investigated MP concentrations in Tokyo Bay using neuston net for surface sampling and deep-sea plankton pump for underwater sampling across six stations at multiple depths. Results revealed substantial variation in MP concentrations. Surface large microplastics (LMP, > 350 μm) ranged from 0.21 × 10 to 3.34 × 10 pieces L, averaging 1.26 × 10 pieces L, while surface small microplastics (SMP, 60 μm to 350 μm) were highest at head of the bay (11.5 ± 3.05 pieces L). SMP concentrations varied with depth and position, peaking at center of the bay (5.79 ± 1.63 pieces L at 2 m). Additionally, the total amount of surface LMP was estimated at 10.3 m and SMP at 15.0 m in the Tokyo Bay. This study provides a comprehensive picture of the spatial and vertical distribution of MP in Tokyo Bay.
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An integrated assessment of microplastic pollution in coastal surface water and sediment of Japan
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Researchers conducted a comprehensive survey of microplastic pollution across 14 coastal locations around Japan from Hokkaido to Okinawa, measuring concentrations of 288.7 g/km2 in surface water and 1,185 kg/km2 in sediment and characterizing polymer types, shapes, and size distributions.
An Integrated Assessmentof Microplastic Pollutionin Coastal Surface Water and Sediment of Japan
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Researchers conducted an integrated assessment of microplastic pollution in coastal surface water and sediment around Japan, providing a comprehensive dataset that clarifies the extent of contamination in Japanese coastal areas previously lacking systematic monitoring data.
Microplastic abundance in the semi-enclosed Osaka Bay, Japan
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Researchers quantified microplastic abundance in the semi-enclosed Osaka Bay, Japan, finding elevated concentrations near river mouths and urban coastal zones, and characterizing dominant polymer types consistent with consumer plastics.
Microplastics on the sea surface of the semi-closed Tokyo Bay
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Researchers surveyed microplastic pollution in Tokyo Bay using neuston nets in May 2019 and January 2020, finding average abundances of 3.98 pieces per square metre with polyethylene fragments dominating, and identifying river inputs as the primary source based on matching seasonal abundance patterns between riverine and inner bay samples.
Comprehensive Understanding of Microplastics Inflow Off the Coast of Funabashi
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Researchers conducted continuous monitoring of microplastic (MP) contamination in rivers, sewage, and coastal waters around Funabashi in Tokyo Bay, finding that MP number densities showed high temporal variability and a gradual decreasing trend, with upstream river sources driving contamination that diminished toward the sea as particles settled into bottom sediments, while sewage was also implicated as a contributor to marine MP pollution.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.