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Concentration, anisotropic and apparent colour effects on optical reflectance properties of virgin and ocean-harvested plastics
Journal of Hazardous Materials ( IF 9.038 ) Pub Date : 2020-10-16 , DOI: 10.1016/j.jhazmat.2020.124290
Shungudzemwoyo P. Garaba; Manuel Arias; Paolo Corradi; Tristan Harmel; Robin de Vries; Laurent Lebreton

We present reflectance measurements collected from virgin and ocean-harvested plastics. Virgin plastics included high and low density polyethylene (HDPE, LDPE), polypropylene (PP) as well as polystyrene (PS). Ocean-harvested plastics were ropes, sheets, foam, pellets and fragmented items previously trawled from the North Pacific Garbage Patch. Nadir viewing angles and plastic pixel coverage were varied to advance our understanding of how reflectance shape and magnitude can be influenced by these parameters. We also investigated the effect of apparent colour of plastics on the measured reflectance from the ultraviolet (UV - 350 nm), visible, near to shortwave infrared (NIR, SWIR - 2500 nm). Statistical analyses indicated that the spectral reflectance of the plastics was significantly correlated to the percentage pixel coverage. There was no clear relationship between the reflectance observed and the viewing nadir angle but dampened materials appear to be more isotropic (near-Lambertian) than their dry counterparts. A loss in reflectance was determined between dry and wet plastics. Location of absorption features was not affected by the apparent colour of objects. In general, ocean-harvested plastics shared more absorption features (~960, 1215, 1440, 1732, 1920 nm) and had lower reflectance intensity compared to the virgin plastics (~980 nm). Prospects for satellite retrieval of plastic type and pixel plastic coverage are discussed based on Top-of-Atmosphere (TOA) signal simulated through radiative transfer computation using the documented plastic reflectances. Non-linear relationships between TOA reflectance and plastic coverage are observed depending on wavelength and plastic type. Most of the plastics analysed impact significantly the TOA signal but two plastic types do not produce strong signal at TOA (hard fragments, LDPE). Nevertheless, all plastic types produce detectable signals when observations are performed within the sunglint direction. The measurements collected in this study are an extension to available high quality spectral reference libraries and can support further research in developing remote sensing algorithms for marine litter.

更新日期:2020-10-17

 

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