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Airborne microplastic radiative effects: a sensitivity study
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Researchers performed climate model simulations with the HadGEM3-GA7.1 atmospheric model to assess the sensitivity of the direct radiative effect of airborne microplastics to updated constraints on their spatial distribution, optical properties, and particle characteristics, finding that microplastics produce a measurable but highly uncertain perturbation of the radiation budget.
Microplastics and nanoplastics are recognised as common airborne pollutants, capable of being transported over large distances and altering the radiative properties of the atmosphere, with implications for global climate. Work in recent years has provided new constraints on many aspects of the spatial and temporal distribution of airborne plastics and their physical and optical properties. Using these updated findings, we perform simulations with the HadGEM3-GA7.1 atmospheric model to investigate the sensitivity of the direct radiative effect of airborne microplastics to these factors. Our ERF estimates range from -0.89 to +0.63 mW m-2 assuming an average surface concentration of 1 MP particle per cubic meter. We show that the sign of the radiative forcing depends on the colour of microplastic particles, and that the abundance of nanoplastics has the strongest influence on the magnitude of their radiative effect, emphasising the importance of experimental work to constrain the micro- and nanoplastic size distribution.
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Global climate model development to constrain the impact of airborne microplastics on climate change
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Researchers developed global climate model components to constrain the radiative and microphysical effects of airborne microplastics, incorporating both direct radiation interactions and indirect effects through cloud condensation nuclei and ice-nucleating particle roles, given that MPs have been detected in cloud water at high altitudes and at remote sites up to 3500 m elevation.
Direct radiative effects of airborne microplastics
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Researchers calculated for the first time how airborne microplastics might affect Earth's climate by absorbing and scattering sunlight, similar to dust particles. At current levels, the climate effect is small compared to other air pollutants, but plastic production has been growing rapidly for decades. As more microplastics accumulate in the atmosphere, their influence on climate could become more significant over time.
The Influence of Atmospheric Microplastics on Global Climate Dynamics: An Interdisciplinary Review
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This interdisciplinary review examines how atmospheric microplastics — because of their unique physical and chemical properties — interact with aerosol processes differently from natural particles such as dust and sea spray, with implications for cloud formation, radiative forcing, and global circulation patterns. The authors synthesize current understanding of how microplastic aerosols may influence climate dynamics and call for their integration into climate modeling frameworks.
Comment on egusphere-2025-1575
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This review examines a global climate model implementation of airborne microplastics as an atmospheric aerosol species, addressing their absence from current climate models despite recognized air quality and climate impacts. The comment evaluates the modeling approach for representing microplastic transport, deposition, and radiative effects in the atmosphere.
Atmospheric warming contributions from airborne microplastics and nanoplastics
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Researchers modeled the direct radiative forcing of atmospheric micro- and nanoplastics using measured optical properties, finding that colored particles absorb light at 74.8 times the rate of pristine particles and produce a mean global forcing of 0.039 W/m² — equivalent to 16% of black carbon — with regional hotspots over ocean gyres where MPs can outforce black carbon by nearly fivefold.
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