Correcting ocean colour reflectance for absorbing aerosols
Absorbing aerosol artefacts are persistent in Sea‐viewing Wide Field‐of‐View Sensor (SeaWiFS) imagery. Atmospheric aerosols absorb light with a strong spectral bias toward shorter wavelengths. Failure to account for their effects can result in underestimates of satellite‐derived water reflectance and overestimates of satellite‐derived chlorophyll concentrations. In this paper, a method to estimate and remove part of this artefact is presented. The method assumes (1) the total artefact is the difference between the current satellite reflectance and true reflectance; and (2) the spectral shape of the artefact caused by absorbing aerosols can be approximated by − n , where is wavelength and n = 6. The solution is explained using an in‐water bio‐optical model but is solved separately using the scattering characteristics of the atmosphere. An error analysis with variable amounts and different spectral types of aerosol artefact indicates that the method adjusts for absorbing aerosol with increasing frequency as the magnitude of the artefact increases. The correction shows robustness to different quantities of aerosol artefacts.
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Document Type: Research Article
Affiliations: NOAA National Ocean Service, Center for Coastal Monitoring and Assessment, 1305 East—West Highway, N/SCI1 Room 9111, Silver Spring, Maryland 20910, USA
Publication date: May 10, 2006