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Microplastic presence in seasonal snow from the Sierra Nevada
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Microplastic Particles in Dust-on-snow, Upper Colorado River Basin, Colorado Rocky Mountains, 2013-16
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Microplastic filaments and fragments were identified in atmospheric dust deposited on snowpack across 14 sites in the Upper Colorado River Basin, with road-tire wear particles matching those found in highway road dust. This pervasive contamination threatens downstream water management and may reduce snowpack albedo, accelerating melt and disrupting regional water supplies.
Microplastic in Glacier Region: Presence, Distribution, and Possible Sources
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Researchers documented the presence, spatial distribution, and likely sources of microplastics in glacier regions, highlighting ice sheets as both sinks and delayed-release reservoirs for plastic pollution. The findings demonstrate that human activity has extended microplastic contamination even into the most remote high-altitude environments on Earth.
Microplastics in the Mount Terminillo (Rieti, Italy) Snow’s
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Snow collected at six sites on a 2,216-meter mountain in Italy contained up to 74 microplastics per liter of meltwater, dominated by synthetic microfibers from textiles and technical outdoor clothing. The finding confirms that even remote, high-altitude mountain snowpack is contaminated, meaning microplastics are transported through the atmosphere far from any pollution source.
Event-Scale Deposition of Atmospheric Microplastics in Snowfall of the Sierra Nevada in North America
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Researchers measured microplastic levels in snow across the Sierra Nevada mountains over six months, finding higher amounts near human activity than in remote areas. Wind-pattern modeling suggested nearby farms, suburbs, and local sources contributed to the microplastics falling in snow.
Effects of Microplastics in the Cryosphere
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Microplastics have been detected at surprisingly high concentrations in cryosphere environments including glaciers, sea ice, and polar snow, where they accumulate through atmospheric deposition and meltwater dynamics. The shrinking of cryosphere regions due to climate change may release stored microplastics back into oceans and freshwater systems, compounding global pollution burdens.
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