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Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Ice-crystal absorption: a comparison between theory and implications for remote sensing.

A J Baran, J S Foot, D L Mitchell

|February 15, 2008

Summary

This summary is machine-generated.

Discrepancies in cirrus crystal size measurements arise from using Mie theory inappropriately. Anomalous diffraction theory (ADT) provides more realistic retrievals, especially when considering particle habits and geometry.

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Area of Science:

Atmospheric Science
Remote Sensing
Cloud Physics

Background:

Discrepancies exist between remote sensing and in situ measurements of cirrus crystal sizes.
Inappropriate application of Mie theory is identified as a primary cause for these discrepancies.

Purpose of the Study:

To investigate the reasons for disagreements in cirrus crystal size determination.
To compare Mie theory with anomalous diffraction theory (ADT) for cirrus cloud remote sensing.
To assess the influence of particle habit on infrared retrieval of crystal size.

Main Methods:

Retrieved absorption optical depth at 8.3 and 11.1 µm using High Resolution Infrared Radiation Sounder (HIRS) data.
Applied Mie theory to ice spheres and ADT to various hexagonal and aggregate ice crystal habits.
Compared retrieval results with in situ measurements of tropical anvil cirrus particles.

Main Results:

Mie theory yielded crystal sizes approximately one-third of those obtained with ADT.
ADT provided more realistic crystal size retrievals compared to in situ data.
Infrared retrieval of crystal size is dependent on the assumed particle habit.

Conclusions:

Anomalous diffraction theory (ADT) is more suitable for retrieving cirrus crystal sizes from infrared data.
Particle geometry and 'tunneling' effects contribute to absorption differences between theories.
Future retrievals must account for particle habit to improve accuracy.