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Transfer of infrared radiation through clouds
Applied Optics
|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.
- 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.
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