Microplastics from Ocean Depths to Landfall: Typhoon-Induced Microplastic Circulation in a Warming Climate

Area of Science:

• Environmental Science
• Atmospheric Chemistry
• Marine Pollution

Background:

• Microplastic (MP) pollution is a growing global concern.
• The atmospheric transport of MPs is an understudied area.
• Typhoons are significant meteorological events with potential to influence atmospheric pollutant distribution.

Purpose of the Study:

• To investigate the impact of typhoons on atmospheric microplastic deposition.
• To elucidate the mechanisms of microplastic transport during typhoon events.
• To explore the feedback loop between climate change, typhoons, and microplastic pollution.

Main Methods:

• Collection and analysis of atmospheric deposition samples during typhoon and non-typhoon periods in eastern China.
• Quantification of microplastic deposition rates, polymer types, and particle sizes.
• Backward trajectory analysis to determine air mass origins.

Main Results:

• Microplastic deposition rates were significantly higher during typhoons (6291–12,722 items/m²/d) compared to non-typhoon periods (48–779 items/m²/d).
• Typhoon periods showed increased polymer diversity (9 types) and a higher proportion of small-sized MPs (<280 μm), including dense polymers like PET and PVC.
• Backward trajectory analysis confirmed marine air mass entrainment, indicating a direct pathway for marine-to-terrestrial MP transport.

Conclusions:

• Typhoons enhance the vertical transport and atmospheric emission of microplastics, particularly from marine environments, through mechanisms like bubble bursting.
• Climate-driven typhoon intensification may exacerbate microplastic pollution, creating a concerning feedback loop with ocean warming and climate change.
• Findings underscore the need for integrated policy development and urban planning to mitigate typhoon-induced microplastic pollution.