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Transfer of infrared radiation through clouds.

P M Kuhn, H K Weickmann, M J Lojko

|February 4, 2010

Summary

This study introduces a new radiative transfer model for cloud absorption, improving infrared cooling calculations. The model accurately predicts cloud radiative properties without assuming cloud thickness.

Area of Science:

Atmospheric Science
Radiative Transfer
Cloud Physics

Background:

Calculating radiative transfer and infrared cooling in clouds is complex.
Previous models often rely on assumptions about cloud thickness and opacity.

Purpose of the Study:

To develop a radiative transfer model for cloud absorption based on observational data.
To improve the accuracy of infrared cooling calculations for various cloud types.

Main Methods:

Developed a model using an observationally determined volume absorption coefficient (0.0005–0.0007 cm⁻¹).
The model accommodates clouds of varying transparency and opacity based on thickness and absorption.

Main Results:

Achieved agreement within a standard deviation of 12.0 W m⁻² between model calculations and approximately 140 observations.

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The model successfully predicted radiative transfer without assuming cloud blackness or thickness.

Conclusions:

The developed radiative transfer model offers a more flexible and accurate approach to cloud radiative property calculations.
This advancement aids in better understanding and modeling Earth's energy balance.