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Retrieving seawater-backscattering profiles from coupling Raman and elastic lidar data
Aleksey V Malinka1, Eleonora P Zege
1B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, F. Scaryna Prospekt 68, Minsk 220072, Belarus. mal@zege.bas-net.by
Applied Optics
|July 15, 2004
Summary
This study introduces a novel lidar technique using elastic and Raman signals to accurately measure seawater-backscattering profiles. The method simplifies data analysis by leveraging specific wavelengths for reliable oceanographic measurements.
Area of Science:
- Ocean Optics
- Remote Sensing
- Lidar Technology
Background:
- Accurate measurement of seawater-backscattering profiles is crucial for understanding oceanographic conditions.
- Traditional lidar methods can be limited by scattering and absorption complexities in marine environments.
Purpose of the Study:
- To develop and validate a new lidar technique for retrieving seawater-backscattering profiles.
- To overcome limitations of existing methods, especially under multiple-scattering conditions.
Main Methods:
- Utilizing joint elastic and Raman lidar returns at specific wavelengths (half-sum of initial and Raman-shifted frequencies).
- Applying power-law approximations for seawater's spectral scattering and absorption properties (400-500 nm).
- Calculating the elastic-backscattering coefficient profile from the ratio of elastic-to-Raman lidar returns.
Main Results:
- The proposed technique yields direct profiles of the elastic-backscattering coefficient.
- The method demonstrates validity even in the presence of multiple scattering.
- Specific wavelengths ensure similar attenuation laws for elastic and Raman signals.
Conclusions:
- This lidar technique offers a robust method for profiling seawater-backscattering.
- It enhances the capability for accurate remote sensing of marine optical properties.
- The approach is particularly valuable for challenging seawater sounding scenarios.