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Related Experiment Video

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Fast light calculations for ocean ecosystem and inverse models.

Curtis D Mobley¹

¹Sequoia Scientific, Inc., 2700 Richards Road, Suite 107 Bellevue, Washington 98005, USA. curtis.mobley@sequoiasci.com

|October 15, 2011

Summary

A new radiative transfer code, EcoLight-S, rapidly calculates underwater light, improving ocean ecosystem models. This tool enhances accuracy for photosynthetically available radiation (PAR) and optical properties in diverse marine waters.

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Area of Science:

Oceanography
Marine Optics
Computational Science

Background:

Ocean ecosystem models require accurate light calculations, often computationally intensive.
Existing analytical models for underwater light are frequently inaccurate, especially in complex waters.
Inverse models necessitate numerous radiative transfer equation solutions for ocean optical property retrieval.

Purpose of the Study:

To develop an extremely fast radiative transfer code, EcoLight-S, for oceanographic applications.
To provide accurate spectral irradiance and related optical variables for ecosystem modeling.
To enable validation of ecosystem predictions using in-water and remote sensing optical data.

Main Methods:

Developed EcoLight-S, a highly efficient radiative transfer subroutine.
Computed spectral irradiances across UV to NIR wavelengths.
Calculated photosynthetically available radiation (PAR) with <10% error in the euphotic zone.

Main Results:

EcoLight-S computes spectral irradiances in under one second on standard hardware.
Achieved high accuracy for PAR, enabling replacement of simpler models.
Successfully applied to Case 2 and optically shallow waters, where analytical models fail.

Conclusions:

EcoLight-S offers a computationally inexpensive yet accurate solution for radiative transfer in ocean models.
The code's ability to compute various optical variables facilitates model-data integration.
EcoLight-S significantly advances the capability to model and validate ocean physical-biological-optical processes.