Spectral variability of the particulate backscattering ratio.

Area of Science:

• Ocean optics
• Marine physics
• Remote sensing

Background:

• Particulate backscattering ratio is crucial for ocean color inversion and light field modeling.
• Limited in situ data exists on the spectral variability of particulate backscattering ratio.
• Theoretical predictions often assume idealized particle properties.

Purpose of the Study:

• To investigate the in situ spectral variability of the particulate backscattering ratio.
• To determine the absolute magnitude and wavelength dependency of particulate backscattering ratio.
• To compare in situ findings with existing theoretical models and empirical values.

Main Methods:

• Conducted five research cruises over three years.
• Collected water column profiles of physical and optical properties.
• Analyzed over 9,000 data points for particulate backscattering ratio at five wavelengths.

Main Results:

• No significant spectral dependence of the particulate backscattering ratio was observed within measurement uncertainty.
• The geometric mean particulate backscattering ratio for the dataset was 0.013.
• The mean particulate backscattering ratio within the first optical depth was 0.010, lower than the commonly used 0.0183.

Conclusions:

• In situ particulate backscattering ratio shows minimal spectral dependence in diverse aquatic environments.
• The findings suggest a revision of commonly used particulate backscattering ratio values in oceanographic models.
• Accurate in situ optical measurements are vital for improving ocean color remote sensing and particle characterization.