Chlorophyll-a concentration inversion and distribution with GOCI images in the Changjiang Estuary

Dinghui shang; Chengcheng Fan; Yonghe Zhang; Xinping Wang

doi:10.1117/12.2682817

24 May 2023 Chlorophyll-a concentration inversion and distribution with GOCI images in the Changjiang Estuary

Dinghui shang, Chengcheng Fan, Yonghe Zhang, Xinping Wang

Proceedings Volume 12706, First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023); 127060S (2023) https://doi.org/10.1117/12.2682817
Event: First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023), 2023, Shanghai, China

Abstract

Chlorophyll-a concentration, as a direct indicator of phytoplankton abundance, is important in the study of marine ecological environment and ecosystem's substance circulation and energy exchanges. This paper investigates the distribution of chlorophyll-a over time and space in the Changjiang Estuary through combining in-situ observation during scientific cruises and Geostationary Ocean Color Imager (GOCI) satellite images. The field measured spectral reflectance curves show significant differences from the near-estuarine region to the offshore region, including features such as peak and trough locations, slope variations, and spectral symmetry. Several popular inversion algorithms of chlorophyll-a concentration are optimized and compared using the training dataset, in which the generalized algal bloom index algorithm (GABI) gets a better accuracy and stability. Monthly average distribution maps derived from GOCI images show that chlorophyll-a concentration in the Changjiang Estuary and adjacent areas is always low (≤3 mg/m3 ) in winter, and slightly higher near the estuarine. In spring and summer, the chlorophyll-a concentration rises gradually due to the increasing water temperature, especially in areas east of the maximum turbidity zone. Moreover, chlorophyll-a concentration is relatively higher in the sea adjacent to the southeast of Zhoushan Islands in autumn.

Citation Download Citation

Dinghui shang, Chengcheng Fan, Yonghe Zhang, and Xinping Wang "Chlorophyll-a concentration inversion and distribution with GOCI images in the Changjiang Estuary", Proc. SPIE 12706, First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023), 127060S (24 May 2023); https://doi.org/10.1117/12.2682817

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KEYWORDS

Reflectivity

Satellites

Data modeling

Satellite imaging

Water

Earth observing sensors

Mathematical optimization

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