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Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer

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Published on: May 29, 2019

Radiative transfer codes for atmospheric correction and aerosol retrieval: intercomparison study.

Svetlana Y Kotchenova¹, Eric F Vermote, Robert Levy

¹Department of Geography, University of Maryland, 4321 Hartwick Road, Suite 209, College Park, Maryland 20740, USA. skotchen@ltdri.org

|May 2, 2008

Summary

This study compared four atmospheric radiative transfer codes used in satellite data processing. Differences were found, impacting aerosol optical thickness and surface reflectance retrieval.

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Area of Science:

Atmospheric Science
Remote Sensing
Radiative Transfer Theory

Background:

Satellite data processing relies on accurate atmospheric radiative transfer codes.
Variations in these codes can introduce uncertainties in retrieved geophysical parameters.
Inter-comparison of widely used codes is essential for data validation.

Purpose of the Study:

To compare the performance of four atmospheric radiative transfer codes: 6SV1.1, RT3, MODTRAN, and SHARM.
To evaluate the impact of code differences on satellite data processing algorithms.
To assess the influence of these differences on retrieved aerosol optical thickness and surface reflectance.

Main Methods:

Performance testing of 6SV1.1, RT3, MODTRAN, and SHARM against established benchmarks.
Utilizing Coulson's tabulated values and a Monte Carlo code for validation.
Theoretical estimation of the influence of code discrepancies using mathematical modeling.

Main Results:

Identified performance variations among the four radiative transfer codes.
Quantified the theoretical impact of these variations on key retrieval parameters.
Demonstrated the necessity of code inter-comparison for robust satellite data analysis.

Conclusions:

The choice of atmospheric radiative transfer code can significantly affect satellite data product accuracy.
Understanding and mitigating code-specific biases are crucial for reliable remote sensing applications.
Further validation and standardization of radiative transfer codes are recommended.