An inversion model of microplastics abundance based on satellite remote sensing: a case study in the Bohai Sea

• Published in: The Science of the total environment 2024-01, Vol.909, p.168537-168537, Article 168537
• Main Authors: Hong, Pingping, Xiao, Jingen, Liu, Hongtao, Niu, Zhiguang, Ma, Yini, Wang, Qing, Zhang, Dianjun, Ma, Yongzheng
• Format: Article
• Language: English
• Subjects: Abundance; Bohai Sea; Inversion model; Microplastics; Remote sensing
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2023.168537

Nowadays, microplastics (MPs) as emerging contaminants have posed great risks to marine ecosystems and human health. However, non-continuous field sampling data makes it difficult to meet the needs of scientific research and pollution control of marine MPs. Consequently, the development of rapid monitoring techniques for marine MPs to achieve efficient acquisition of data is increasingly essential. Remote sensing technology provides a convenient and effective tool for monitoring and mapping marine MPs pollution. Therefore, we established an inversion model based on multiple regression by combining the remote sensing data and the measured data to predict the MPs pollution status in the Bohai Sea. The feature variables of a model are crucial to the prediction, and we proposed three methods of variable selection, namely successive projections algorithm (SPA), band combination method, and remote sensing index method. By comparing accuracy evaluation metrics, an approach based on SPA was selected to analyze the abundance and spatio-temporal distribution of MPs in the Bohai Sea in 2022. The determination coefficient of the SPA model is 0.75, and the root mean square error is 0.38 items/m3. The error of the model is within an acceptable range. It was found that the MPs abundance on the sea surface of the Bohai Sea varied significantly in different seasons and regions. This study indicates that satellite remote sensing technology has great potential in monitoring marine MPs. [Display omitted] •An inversion model of microplastics abundance based on remote sensing was constructed.•Feature wavelengths were screened by successive projections algorithm.•The spatio-temporal distribution of microplastics in the Bohai Sea were analyzed.•The influences of spatio-temporal distribution of microplastics were discussed.