Related Experiment Video
Updated: Oct 30, 2025
05:31
Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
Published on: July 28, 2018
16.3K
The missing ocean plastic sink: Gone with the rivers
Lisa Weiss1, Wolfgang Ludwig2, Serge Heussner2
1CEFREM, UMR 5110 University of Perpignan-CNRS, F-66860 Perpignan Cedex, France. lisa.weiss@univ-perp.fr.
Science (New York, N.Y.)
|July 2, 2021
Summary
River plastic pollution estimates are overestimated. Reanalysis shows microplastic flux is much lower, increasing their ocean surface residence time and reducing the need for a missing plastic sink.
Area of Science:
- Environmental Science
- Oceanography
- Pollution Studies
Background:
- Millions of tons of plastic enter oceans annually via rivers, yet surface plastic amounts are far lower.
- This imbalance suggests a missing sink responsible for rapid plastic removal from the ocean surface.
Purpose of the Study:
- To re-evaluate riverine plastic flux assessments using updated data.
- To determine the actual residence time of microplastics in the ocean surface.
Main Methods:
- Statistical reanalysis of updated microplastic data.
- Comparison of ocean and river sampling techniques for microplastics.
Main Results:
- River flux assessments for microplastics are overestimated by 100 to 1000 times.
- The estimated residence time of microplastics at the ocean surface increases from days to years.
Conclusions:
- The theoretical need for a missing plastic sink is significantly reduced.
- Current microplastic pollution models require revision based on more accurate flux data.
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