We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
The ocean’s color is changing near the Great Pacific Garbage Patch
AI summary Read the abstract
Researchers analyzed 20 years of satellite ocean color data near the Great Pacific Garbage Patch and found the water has become brighter in blue and green light compared to surrounding ocean. Using computer modeling, they linked this color shift to suspended microplastics rather than natural ocean changes, suggesting satellite measurements could help track microplastic buildup in the ocean.
Abstract Marine microplastic pollution has proven remarkably difficult to detect from satellite. However, decades of satellite ocean color measurements have revealed long-term changes in the ocean’s optical signature, which may be influenced by the aggregation of small suspended microplastics in some regions. Analyzing three 20-year records of satellite ocean color reflectance over the North Pacific, we find distinct brightening in both blue and green spectral bands near the Great Pacific Garbage Patch relative to the surrounding ocean. Using radiative transfer modeling, we show that the spectral shift observed corresponds to expectations for the accumulation of suspended microplastics beyond reasonable uncertainty. Finally, we utilize a Monte Carlo approach to generate over 50,000 ocean brightening spectra to determine the likelihood that the observed brightening is attributable to natural multidecadal biogeochemical changes. Microplastics in the water column correspond with a more than four-fold increase in likelihood of the ocean color changes observed near the Great Pacific Garbage Patch, indicating that the spectral shape of brightening caused by small microplastics is unlikely to be caused by natural shifts in ocean color variables and may be used as a diagnostic tool to assess microplastic accumulation from satellite ocean-color measurements.
More Papers Like This
Evidence that the Great Pacific Garbage Patch is rapidly accumulating plastic
AI summary Read the abstract
Researchers analyzed long-term data from the Great Pacific Garbage Patch and found that plastic is rapidly accumulating, with the mass of floating plastic growing faster than inputs would suggest, pointing to an underestimated and worsening pollution problem.
Detection and Dynamic Imaging of Ocean Microplastics from Space
AI summary Read the abstract
Researchers developed a remote sensing approach using satellite imagery to detect and dynamically image ocean microplastic concentrations, offering broader spatial coverage than traditional net trawling methods. This study demonstrates that optical signatures of floating plastic patches can be identified from space under certain sea and lighting conditions.
Concentration, anisotropic and apparent colour effects on optical reflectance properties of virgin and ocean-harvested plastics
AI summary Read the abstract
Researchers measured the light reflectance of virgin and ocean-collected plastic samples across a wide range of wavelengths to build a spectral reference library that could support satellite-based detection of ocean plastic debris. They found that weathered ocean plastics share distinct light absorption features and lower reflectance than new plastics, offering a potential path toward identifying plastic type and coverage from space.
Abundance and ecological implications of microplastic debris in the North Pacific Subtropical Gyre
AI summary Read the abstract
This doctoral dissertation investigated microplastic pollution in the North Pacific Subtropical Gyre, known as the Great Pacific Garbage Patch. Researchers documented that microplastic concentrations increased by two orders of magnitude between 1972-1988 and 1999-2010, with small particles dominating by number but large objects dominating by surface area. The work also examined how plastics affect surface-dwelling zooplankton communities and how differential weathering rates explain changes in plastic composition over time.
Long-term aging and degradation of microplastic particles: Comparing in situ oceanic and experimental weathering patterns
AI summary Read the abstract
Researchers weathered polypropylene and polyethylene pellets in sunlight and seawater for three years and compared chemical bond changes via FTIR spectroscopy to particles collected from North Pacific ocean gyres, estimating that most gyre plastics have been at sea for more than 18 months — consistent with ocean circulation residence-time models.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.