Journal of Marine Sciences ›› 2021, Vol. 39 ›› Issue (2): 43-51.DOI: 10.3969/j.issn.1001-909X.2021.02.005

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Chlorophyll-a retrieval and eutrophication assessment of sea area around the Dajin Island based on multi-source remote sensing images

XIONG Yixuan1, MA Shuchang1, ZHANG Xiaoyu*1,2,3, HUANG Guorong1, CHEN Jiaxing1, HAN Yachao4#br#

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  1. 1.School of Earth Science, Zhejiang University, Hangzhou 310027, China; 
    2.Hainan Institute of Zhejiang University, Sanya 572000, China;
    3.Ocean Academy, Zhejiang University, Zhoushan 316021, China;
    4.China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
  • Online:2021-06-15 Published:2021-06-15

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Abstract: Based on the measured Chl-a concentration and sea surface spectrum, the Chinese white dolphin inhabited area of Dajin Island in the Pearl River Estuary was taken as the study area, a Chl-a inversion model suitable for CASI aerial hyperspectral and MODIS satellite remote sensing images was constructed and Chl-a concentration inversion was carried out. The results show that the band ratio model has better performance based on CASI images. The Chl-a concentrations in the study area are 0.1-4.4 μg/L, and the relative average error is 14%. Inversed with MODIS, the Chl-a concentrations in the Pearl Estuary vary from 0 to 8 μg/L with relative average error of 17%. In general, the Chl-a in the sea water around Dajin Island is uniformly low. The Carlson eutrophic index calculated based on the concentration of Chl-a indicates that the sea area around Dajin Island is at the level of oligotrophic and mesotrophic, the complex hydrodynamic and high turbidity may be the main factors inhibiting the growth of phytoplankton in the study area.

Key words: CASI airborne hyperspectral data, MODIS satellite image, sea area around Dajin Island, Chl-a retrieval model, eutrophication assessment

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