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METHODS article

Front. Mar. Sci.
Sec. Marine Pollution
Volume 11 - 2024 | doi: 10.3389/fmars.2024.1434225

Retrieval and spatiotemporal variation of total suspended matter concentration using a MODIS-derived hue angle in the coastal waters of Qinhuangdao, China

Provisionally accepted
Lin Wang Lin Wang 1*Xiang Wang Xiang Wang 1*Qinghui Meng Qinghui Meng 1*Yanlong Chen Yanlong Chen 1*Xinxin Wang Xinxin Wang 1*Lingling Jiang Lingling Jiang 2Yuhao Shang Yuhao Shang 2*
  • 1 National Marine Environmental Monitoring Center, Dalian, China
  • 2 Dalian Maritime University, Dalian, Liaoning Province, China

The final, formatted version of the article will be published soon.

    The CIE hue angle has significant potential in marine ecology and environment monitoring using remote sensing methods. It is calculated from the remote sensing reflectance (Rrs) of all visible bands, which serves as a comprehensive indicator of seawater radiance information and represents one of the key quantitative parameters for assessing seawater color. In this study, a remote sensing retrieval model of total suspended matter concentration (TSM) was developed using the in situ measured data acquired in the coastal waters of Qinhuangdao from 2013 to 2021. This model, based on the CIE hue angle, achieved performance metrics of R 2 =0.68, MAPE=24.47%, and RMSE=2.72 mg/L, demonstrating better accuracy than traditional empirical models that utilize fewer bands. Based on this model, the monthly and interannual TSM in the coastal waters of Qinhuangdao from 2003 to 2023 were retrieved. Influenced by natural factors, such as the monsoons, the TSM in the coastal waters of Qinhuangdao generally exhibited a trend of first decreasing and then increasing from January to December. Except for certain anomalous years (2007, 2008, 2017, etc.), the overall variation process of TSM from 2003 to 2023 showed an initial increase followed by a decrease, closely related to the pollution reduction management requirements implemented by the Chinese government in different periods. The findings of this paper demonstrate that the coastal waters of Qinhuangdao have become clearer, and the ecological environment has been effectively improved as a result of the Chinese government's vigorous promotion of ecological civilization construction, adhering to the development concept that 'lucid waters and lush mountains are invaluable assets', and by introducing the action plan for the comprehensive treatment of pollution in the Bohai Sea.

    Keywords: Total Suspended Matter concentration (TSM), Spatiotemporal variation, CIE hue angle, aqua MODIS, Coastal waters

    Received: 17 May 2024; Accepted: 02 Jul 2024.

    Copyright: © 2024 Wang, Wang, Meng, Chen, Wang, Jiang and Shang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Lin Wang, National Marine Environmental Monitoring Center, Dalian, China
    Xiang Wang, National Marine Environmental Monitoring Center, Dalian, China
    Qinghui Meng, National Marine Environmental Monitoring Center, Dalian, China
    Yanlong Chen, National Marine Environmental Monitoring Center, Dalian, China
    Xinxin Wang, National Marine Environmental Monitoring Center, Dalian, China
    Yuhao Shang, Dalian Maritime University, Dalian, 116026, Liaoning Province, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.