Implementation of an analytical Raman scattering correction for satellite ocean-color processing

Area of Science:

• Ocean optics
• Remote sensing
• Inelastic light scattering

Background:

• Raman scattering by seawater molecules is an inelastic process impacting ocean color data.
• Uncorrected Raman scattering can introduce biases in derived inherent optical properties (IOPs).

Purpose of the Study:

• To describe and validate a Raman scattering correction (RSC) algorithm for NASA's ocean color processing.
• To assess the impact of the RSC on derived IOPs and retrieval accuracy.

Main Methods:

• Integration of the RSC algorithm into NASA's standard ocean-color processing software.
• Testing the RSC in conjunction with the Generalized Inherent Optical Properties algorithm (GIOP).
• Comparison of derived IOPs with in situ data and analysis of time-series data.

Main Results:

• The RSC reduced derived backscattering and phytoplankton absorption coefficients.
• Absorption coefficient of colored dissolved and detrital matter remained unchanged.
• The RSC did not degrade the retrieval skill of the GIOP algorithm.

Conclusions:

• The developed RSC algorithm accurately corrects for Raman scattering in ocean color data.
• The RSC improves the reliability of derived IOPs without compromising retrieval accuracy.
• This correction is crucial for precise oceanographic studies using satellite data.