Medium resolution imaging spectrometer (MERIS) estimation of chlorophyll-a concentration in the turbid sediment-laden waters of the Changjiang (Yangtze) Estuary

Satellite estimation of chlorophyll-a (Chl-a) concentration in the Changjiang Estuary is challenging for ocean-colour retrieval algorithms. The Changjiang Estuary is characterized by suspended-sediment-dominated waters in the mouth and optically complex case 2 waters offshore of the mouth. Satellite...

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Bibliographic Details
Published in:International journal of remote sensing 2010-09, Vol.31 (17-18), p.4635-4650
Main Authors: Shen, Fang, Zhou, Yun-Xuan, Li, Dao-Ji, Zhu, Wei-Jian, Suhyb Salama, Mhd
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied geophysics
Biological and medical sciences
Brackish
Earth sciences
Earth, ocean, space
Estuaries
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
Imaging spectrometers
Internal geophysics
Remote sensing
Teledetection and vegetation maps
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Summary:Satellite estimation of chlorophyll-a (Chl-a) concentration in the Changjiang Estuary is challenging for ocean-colour retrieval algorithms. The Changjiang Estuary is characterized by suspended-sediment-dominated waters in the mouth and optically complex case 2 waters offshore of the mouth. Satellite ocean-colour products show that high-sediment loads of estuarine waters can cause overestimations or invalid flags of Chl-a concentration. A synthetic chlorophyll index (SCI) was designed for extracting chlorophyll information and for minimizing the influence of sediments on the remote-sensing reflectance spectrum. An SCI algorithm, a quadratic polynomial function of the SCI versus Chl-a concentration, was applied to the estimation of Chl-a concentration from Medium Resolution Imaging Spectrometer (MERIS) images. The overestimation of Chl-a concentration was corrected. The SCI algorithm has applications for MERIS estimation of Chl-a concentration in turbid waters with a moderate to high suspended-sediment concentration.
ISSN:0143-1161
1366-5901
DOI:10.1080/01431161.2010.485216