A novel method for estimation of aerosol radiance and its extrapolation in the atmospheric correction of satellite data over optically complex oceanic waters

Atmospheric correction of satellite ocean color imagery in sediment-laden and algal bloom waters remains to be a challenging task because of the inefficiency of present methods to accurately assess aerosol radiances in the near-infrared (NIR) bands and extrapolate these into the visible spectrum. Th...

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Bibliographic Details
Published in:Remote sensing of environment 2014-02, Vol.142, p.188-206
Main Authors: Singh, Rakesh Kumar, Shanmugam, Palanisamy
Format: Article
Language:English
Subjects:
Aerosols
Algae
Algal blooms
Animal, plant and microbial ecology
Applied geophysics
Atmospheric correction
Bands
Biological and medical sciences
Earth sciences
Earth, ocean, space
Exact sciences and technology
Extrapolation
Fundamental and applied biological sciences. Psychology
General aspects. Techniques
Internal geophysics
MODIS–Aqua
Ocean color
Optically complex waters
Radiance
Satellite imagery
Switching
Teledetection and vegetation maps
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Summary:Atmospheric correction of satellite ocean color imagery in sediment-laden and algal bloom waters remains to be a challenging task because of the inefficiency of present methods to accurately assess aerosol radiances in the near-infrared (NIR) bands and extrapolate these into the visible spectrum. This study presents a novel method for estimation and extrapolation of aerosol radiances in MODIS–Aqua bands over optically complex oceanic waters dominated by suspended sediments and algal blooms. The Rayleigh-corrected radiance at 748nm, after correcting the influence of the elevated radiance contributed by suspended sediments and algal blooms, is employed in the present method to estimate aerosol radiance in a MODIS–Aqua band centered at 531nm. Then, the normalized Gaussian distribution function is used to extrapolate aerosol radiance over the entire wavebands (from 412 to 748nm). This method retrieves water-leaving radiances Lw(λ) nearly comparable to those of the NIR scheme for extremely clear waters (chlorophyll
ISSN:0034-4257
1879-0704
DOI:10.1016/j.rse.2013.12.001