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Related Experiment Video

Updated: Jun 17, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Near infrared scattering by sunlit terrestrial clouds.

H H Blau¹, R P Espinola, E C Reifenstein

¹Arthur D. Little, Inc., Cambridge, Massachusetts 02140, USA.

|January 6, 2010

Summary

This summary is machine-generated.

Cloud scattering spectra reveal differences between ice and liquid water clouds in the 1.15- to 3.6-micrometer range. Particle size significantly impacts scattering efficiency and spectral features, aligning with theoretical predictions.

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Area of Science:

Atmospheric optics
Cloud physics
Spectroscopy

Background:

Solar radiation scattering by clouds is crucial for Earth's energy balance.
Understanding cloud optical properties requires detailed spectral analysis.
Previous studies lacked comprehensive data across various cloud types and scattering angles.

Purpose of the Study:

To measure absolute intensity spectra of solar radiation scattered by clouds.
To investigate the angular dependence of cloud scattering across different wavelengths.
To differentiate scattering characteristics of ice and liquid water clouds.

Main Methods:

Acquisition of radiance spectra in the 1.15- to 3.6-micrometer region.
Measurements as a function of cloud type, altitude, and scattering angle.
Analysis of spectral features and scattering efficiency.

Main Results:

Scattering efficiency increased significantly with decreasing scattering angle, particularly in strongly absorbing regions (2.6-2.9 µm).
Ice clouds exhibited characteristic spectral minima at 1.5, 2.0, and 2.8 µm due to absorption.
These minima were absent in liquid-water clouds, despite similar bulk absorption properties.

Conclusions:

Particle size is a key factor explaining the observed differences in scattering behavior between ice and liquid water clouds.
The findings align with theoretical models of light scattering.
Spectral analysis provides valuable insights into cloud microphysical properties.