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Efficient single-scattering lookup table for lidar and polarimeter phytoplankton studies
Optics Letters
|May 1, 2024
Summary
A new lookup table significantly speeds up calculations for oceanic phytoplankton properties, crucial for remote sensing missions like NASA
Area of Science:
- Ocean optics
- Remote sensing
- Computational physics
Background:
- Remote sensing of oceanic phytoplankton requires computationally intensive single-scattering calculations.
- Existing lookup tables (LUTs) accelerate these calculations for atmospheric aerosols and water droplets.
Purpose of the Study:
- To develop a Lorenz-Mie lookup table for tabulating single scattering by oceanic phytoplankton.
- To enhance computational speed for microphysical property retrievals in missions like NASA's PACE.
Main Methods:
- Tabulation of single scattering using a Lorenz-Mie lookup table for coated isotropic spheres representing phytoplankton.
- Covering phytoplankton radii from 0.15-100 µm and a range of complex refractive indices.
- Validation against single-scattering calculations for inherent optical properties.
Main Results:
- Achieved up to a 10^4-fold increase in computational speed compared to direct calculations.
- Precisely computed inherent optical properties for phytoplankton size distributions.
- Demonstrated agreement with single-scattering calculations within 1% for 99.9% of cases.
Conclusions:
- The developed lookup table provides a significant computational speedup for oceanic phytoplankton remote sensing.
- The table and associated codes are freely available for algorithm development and research.
- Enables more efficient processing of data for missions like NASA's PACE.
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