Raman scattering in ocean optics: quantitative assessment of internal radiant emission

Area of Science:

• Ocean optics
• Radiative transfer theory
• Spectroscopy

Background:

• Raman scattering is a key process affecting light propagation in natural waters.
• Understanding the internal radiant emission is crucial for accurate oceanographic modeling.
• Previous studies have limited quantitative assessments of Raman scattering's impact on irradiance fields.

Purpose of the Study:

• To provide further documentation of Raman-scattering activity in clear ocean waters.
• To develop and propose a novel method for assessing internal radiant emission composition.
• To validate the proposed method using Monte Carlo simulations and optical data.

Main Methods:

• Utilizing Monte Carlo simulations to model light transport and Raman scattering.
• Collecting and analyzing in-situ optical data from the Sargasso Sea.
• Developing a method based on the anomalous absorption coefficient for nonconservative irradiance fields.

Main Results:

• Confirmed significant Raman-scattering activity in clear ocean waters.
• Demonstrated the effectiveness of the proposed method in assessing internal radiant emission.
• Quantified the percentile composition of internal radiant emission at various depths.

Conclusions:

• Raman scattering plays a measurable role in the underwater light field.
• The proposed anomalous absorption coefficient method offers a robust tool for analyzing irradiance fields.
• This research enhances the understanding of radiative transfer in oceanic environments.