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Biological uptake of microplastics by marine life may explain the "missing" surface plastic. This study models microplastic spread, revealing how ocean biology influences their distribution and inventory.

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Area of Science:

  • Oceanography
  • Environmental Science
  • Marine Biology

Background:

  • Approximately 4% of global plastic waste enters the ocean annually.
  • The distribution and fate of microplastics in marine environments are not fully understood.
  • Buoyant plastics can be modeled, but microplastic behavior is complex due to aggregation with marine snow and fecal pellets.

Purpose of the Study:

  • To investigate the role of biological processes in the global distribution and inventory of microplastics.
  • To assess if biological uptake can account for the "missing" fraction of surface microplastics.
  • To develop a tool for quantitatively evaluating hypotheses of microplastic-ocean biology interactions.

Main Methods:

  • Development of a new microplastic model integrated into an Earth system model.
  • Exploration of the model's parameter space to simulate microplastic dynamics.
  • Quantification of the impact of biological uptake on microplastic distribution and inventory.

Main Results:

  • Biological uptake significantly influences global microplastic inventory and distribution.
  • This biologically-mediated pathway can account for the "missing" surface microplastic fraction.
  • Despite being an inefficient removal mechanism, biological uptake plays a crucial role.

Conclusions:

  • Biological interactions are a key factor in understanding microplastic fate in the ocean.
  • The developed model provides a framework for assessing microplastic-ocean biology interactions globally.
  • Further observational data is needed to refine model parameters and validate findings.