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Field Measurement of Effective Leaf Area Index using Optical Device in Vegetation Canopy

Field Measurement of Effective Leaf Area Index using Optical Device in Vegetation Canopy

Published on: July 29, 2021

Sensitivity of a lidar inversion algorithm to parameters relating atmospheric backscatter and extinction.

H G Hughes¹, J A Ferguson, D H Stephens

¹Naval Ocean Systems Center, Ocean & Atmospheric Sciences Division, San Diego, California 92152-5000, USA.

|June 1, 1985

Summary

This study shows lidar inversion algorithms are highly sensitive to backscatter-extinction ratio uncertainties. This limits their use for aerosol extinction when atmospheric conditions vary.

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Area of Science:

Atmospheric Science
Optical Remote Sensing
Lidar Technology

Background:

Accurate atmospheric aerosol characterization is crucial for climate and air quality studies.
Single-scattering lidar equations require assumptions relating backscatter and extinction coefficients.
The backscatter-to-extinction ratio (beta/sigma) is often assumed constant with range.

Purpose of the Study:

To investigate the sensitivity of a lidar inversion algorithm to uncertainties in the backscatter-to-extinction ratio parameters (C2 and k).
To evaluate the reliability of lidar-derived aerosol extinction coefficients and visibility under varying atmospheric conditions.

Main Methods:

Utilized a measured lidar return from a horizontally homogeneous atmosphere with reduced visibility.
Applied a lidar inversion algorithm to calculate extinction coefficients and visibilities for different C2 and k values.
Compared algorithm-derived values with those obtained using the lidar slope method.

Main Results:

Calculated extinction coefficients and visibilities demonstrated extreme sensitivity to uncertainties in the parameter C2.
The lidar inversion algorithm's performance was significantly impacted by variations in the assumed backscatter-to-extinction ratio.
Discrepancies were noted between algorithm-derived and slope-method-inferred values.

Conclusions:

The usefulness of this lidar inversion algorithm for aerosol extinction applications is questionable when air mass characteristics change along the measurement path.
Accurate knowledge or robust estimation of the backscatter-to-extinction ratio is critical for reliable lidar-based aerosol profiling.
Further research is needed to develop lidar inversion techniques less sensitive to ratio uncertainties in heterogeneous atmospheres.