Microplastics could affect cloud formation and climate by promoting ice nucleation
Airborne microplastics, known to reach even remote regions, may influence cloud formation by acting as ice nucleation sites at warmer temperatures, potentially impacting precipitation and climate patterns.
Heidi Busse and Miriam Freedman write for The Conversation.
In short:
- Microplastics in the atmosphere can promote ice formation in clouds at temperatures higher than usual, which could increase rain or snowfall.
- Different types of microplastics studied showed varying capacities to nucleate ice, particularly after exposure to environmental elements like UV light and ozone.
- Researchers call for more studies on microplastics' atmospheric concentration to assess their impact on weather and climate compared to natural particles like dust.
Key quote:
"Microplastics in the air may affect weather and climate by producing clouds in conditions where they would not form otherwise."
— Miriam Freedman, professor of chemistry at Penn State.
Why this matters:
Microplastics are pervasive in the environment and can travel great distances, even reaching cloud-forming altitudes. If they increase ice nucleation in clouds, they may alter precipitation patterns, with implications for water availability and climate balance worldwide.
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