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61,005 resultsShowing papers similar to How long for plastics to decompose in the deep sea?
ClearPlastic pollution in deep seafloor of the South China Sea
Researchers documented the abundance, distribution, and transport of plastics in the South China Sea using over 100 manned submersible dives combined with video analysis, finding that large plastics concentrate in canyon geomorphological units while microplastics predominate in coastal sediments via distinct transport mechanisms.
Degradation of polyethylene terephthalate (PET) and polypropylene (PP) plastics in seawater
Laboratory experiments simulating deep ocean conditions found that PET and PP plastic degradation in seawater increased with time, with pressure having minimal effect on degradation rate, suggesting that understanding plastic carbon footprint must account for deep-sea degradation dynamics.
Microplastic pollution in deep-sea sediments and organisms of the Western Pacific Ocean
Researchers collected deep-sea sediment and organism samples from multiple sites in the western Pacific Ocean and found microplastics at all locations sampled, with depth, distance from land, and current patterns influencing accumulation, confirming the western Pacific deep sea as a significant microplastic sink.
Distribution and controlling factors of microplastics in surface sediments of typical deep-sea geomorphological units in the northern South China Sea
Researchers collected surface sediments from typical deep-sea geomorphological units — sand dunes, sediment drifts, and submarine canyon channels and levees — in the northern South China Sea to examine how sedimentary dynamic conditions control the distribution of microplastics in deep-sea environments.
Comparison of Microplastic abundance in varying depths of deep-sea sediments, Bay of Bengal
Researchers measured microplastic concentrations in deep-sea sediment samples from the Bay of Bengal at depths of 225 to 1,070 meters, finding the highest concentrations at intermediate depths. The findings add to evidence that microplastics have penetrated into deep-sea environments far from the surface.
Estimation of the age of polyethylene microplastics collected from oceans: Application to the western North Pacific Ocean
Scientists developed a method to estimate how long polyethylene microplastics have been floating in the ocean by measuring their chemical degradation level and matching it to UV exposure data. They applied this technique to samples from the western North Pacific and estimated ages ranging from months to years. Knowing the age of ocean microplastics helps researchers trace where plastic pollution originates and how far ocean currents carry it.
Microplastic pollution in deep-sea sediments
Researchers analyzed deep-sea sediment cores and found microplastics present at depth, providing early evidence that deep-sea sediments globally accumulate microplastic pollution far from coastlines and at the seafloor.
Effects of Plastic Pollution on Deep Ocean Biota and Ecosystems
This article examines how plastic pollution affects deep ocean ecosystems, describing how plastics sink to the seafloor and potentially affect deep-sea biota through ingestion, toxin introduction, transport of invasive species, and alteration of seafloor substrate from soft to hard bottom. The deep ocean acts as a long-term sink for plastic pollution with poorly understood ecological consequences.
Plastics in the deep sea – a global estimate of the ocean floor reservoir
This systematic review estimates the total amount of plastic pollution resting on the deep ocean floor worldwide. The research reveals that the deep sea serves as a massive reservoir for plastic waste, which is concerning because as these plastics break down into microplastics over time, they can be consumed by deep-sea organisms and re-enter the food chain.
Degradation and lifetime prediction of plastics in subsea and offshore infrastructures
This review examines the degradation of synthetic plastics used in subsea and offshore infrastructure, presenting a new mathematical model to predict their lifespan at various ocean depths. Researchers found that plastic degradation rates decrease significantly with water depth due to changes in temperature, light intensity, and pressure. The model suggests that deeply submerged plastics may persist for extremely long periods, with important implications for microplastic generation from offshore structures.
Short-term degradability of plastic in the marine environment
Researchers incubated seven common plastic polymers (PET, HDPE, PVC, LDPE, PP, PS, and EPS) in the marine environment for 40 days at two sites and two seasons, characterizing degradation through visual inspection, mass change, contact angle, FTIR, and SEM analysis. No significant mass loss occurred, but significant changes in oxidation status were recorded with an oscillating trend, and EPS showed the greatest chemical alteration, with macro-biofouling settlement appearing to shield plastics from photochemical degradation.
Tracing the Century‐Long Evolution of Microplastics Deposition in a Cold Seep
Researchers traced a century of microplastic deposition in a deep-sea cold seep, finding that burial rates increased significantly since the 1930s in non-seepage areas, while methane seepage zones showed lower microplastic levels, suggesting potential microbial degradation of plastics.
Elucidating the distribution and characteristics of microplastics in water column of the northwestern South China Sea with a large-volume in situ filtration technology (plankton pump)
Researchers used a large-volume in-situ filtration device to sample microplastics throughout the water column of the northwestern South China Sea, including deep waters. They found concentrations of 0.2–1.5 items/m³ (average 0.56/m³), dominated by PP and PET fragments, with no significant differences in abundance or polymer type across depths.
Pathways for degradation of plastic polymers floating in the marine environment
This review examined the pathways and mechanisms by which plastic polymers degrade in the marine environment, covering photodegradation, mechanical fragmentation, and biodegradation and estimating the timescales involved.
Fate of microplastics in deep-sea sediments and its influencing factors: Evidence from the Eastern Indian Ocean
Surface sediments from 26 sites in the deep basin of the Eastern Indian Ocean were analyzed for microplastics, finding concentrations ranging widely and influenced by water depth, distance from land, and ocean current patterns. The study extends deep-sea microplastic monitoring to the Indian Ocean and identifies oceanographic transport as a key control on plastic distribution.
The deep sea is a major sink for microplastic debris
Researchers analyzed deep-sea sediments from the Atlantic, Mediterranean, and Indian Ocean and found microplastic fibers up to 4 orders of magnitude more concentrated than at the contaminated sea surface, identifying the deep seafloor as a vast and previously unknown repository of the world's 'missing' plastic.
Plastics from Surface to Seabed: Vertical Distribution of (Micro)plastic Particles in the North Pacific Ocean
Researchers investigated the vertical distribution of microplastics across the water column and deep-sea sediments (>5 km) in the North Pacific Ocean, finding concentrations of 8-2600 items/m3 in the water column and 1100-3200 items/kg in sediments, with distinct patterns across the North Pacific Subtropical Gyre, Papahanaumokuakea Monument, and a less-polluted open ocean site.
Long-term aging and degradation of microplastic particles: Comparing in situ oceanic and experimental weathering patterns
Researchers weathered polypropylene and polyethylene pellets in sunlight and seawater for three years and compared chemical bond changes via FTIR spectroscopy to particles collected from North Pacific ocean gyres, estimating that most gyre plastics have been at sea for more than 18 months — consistent with ocean circulation residence-time models.
Dispersion, accumulation and the ultimate fate of microplastics in deep-marine environments: A review and future directions
This review synthesized existing knowledge on microplastic distribution in deep-marine environments, integrating process-based sedimentological transport models with field data to outline how microplastics disperse, accumulate, and become buried in seafloor sediments, and identifying key gaps for future research.
Occurrence, Composition, and Relationships in Marine Plastic Debris on the First Long Beach Adjacent to the Land-Based Source, South China Sea
Researchers characterized the occurrence, composition, and relationships of marine plastic debris collected from a remote location during a first systematic survey. The study provides baseline data on plastic litter types and polymer composition in an understudied marine region.
Environmental Factors Shaping Microbial Biodegradation of Marine Microplastics
This review systematically summarises microbial degradation mechanisms for polyethylene and PET in marine environments, examining biofilm formation, key enzymatic reactions, aerobic and anaerobic pathways, and how environmental factors including temperature, pressure, oxygen, salinity, and light constrain biodegradation in shallow versus deep-sea systems.
Consistent microplastic ingestion by deep-sea invertebrates over the last four decades (1976–2015), a study from the North East Atlantic
Researchers found consistent microplastic ingestion by deep-sea invertebrates in the North East Atlantic over a 40-year period from 1976 to 2015, demonstrating that microplastic contamination of remote deep-sea habitats is a long-standing and persistent problem.
Microbial decomposition of biodegradable plastics on the deep-sea floor
Researchers demonstrated that microbes on the deep-sea floor can decompose certain biodegradable plastics, even at depths greater than 5,000 meters and near-freezing temperatures. However, not all biodegradable plastics broke down equally, with PLA (a common biodegradable plastic) showing no degradation at any site. This means that while some biodegradable alternatives do break down in the deep ocean, others persist just like conventional plastics.
First long-term evidence of microplastic pollution in the deep subtropical Northeast Atlantic
Researchers found microplastic particles in all 110 sediment trap samples collected over a 12-year period from 2,000-meter depths in the Northeast Atlantic, establishing the deep ocean as a long-term sink for microplastics with fluxes increasing over time.