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Measuring Marine Plastic Debris from Space: Initial Assessment of Observation Requirements
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This paper assesses what satellite observation capabilities would be needed to meaningfully monitor marine plastic debris from space, outlining requirements for spatial resolution, spectral bands, and revisit frequency. Developing such a remote sensing capability could revolutionize global tracking of plastic pollution at scales not achievable through ship-based surveys.
Sustained observations are required to determine the marine plastic debris mass balance and to support effective policy for planning remedial action. However, observations currently remain scarce at the global scale. A satellite remote sensing system could make a substantial contribution to tackling this problem. Here, we make initial steps towards the potential design of such a remote sensing system by: (1) identifying the properties of marine plastic debris amenable to remote sensing methods and (2) highlighting the oceanic processes relevant to scientific questions about marine plastic debris. Remote sensing approaches are reviewed and matched to the optical properties of marine plastic debris and the relevant spatio-temporal scales of observation to identify challenges and opportunities in the field. Finally, steps needed to develop marine plastic debris detection by remote sensing platforms are proposed in terms of fundamental science as well as linkages to ongoing planning for satellite systems with similar observation requirements.
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This review examined satellite remote sensing technologies for detecting and monitoring marine pollution including oil spills, HABs, plastic debris, and sediment plumes, covering different sensor types and their capabilities. The authors identify current limitations of resolution and revisit frequency as key barriers to routine remote monitoring of microplastic pollution.
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This review evaluates the current state of satellite and aerial remote sensing for detecting marine plastic debris, noting that while progress has been made using optical and hyperspectral imaging, significant challenges remain including low detection resolution for small particles, confusion with other floating materials, and the need for better machine learning algorithms. The paper is relevant to the microplastics field as large-scale monitoring tools are needed to track plastic pollution distribution and inform cleanup and policy efforts, though direct detection of microplastics (<5 mm) from orbit remains largely out of reach with current technology.
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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.