References

AMTD

Atmospheric Measurement Techniques Discussions

AMTD

1867-8610

Copernicus GmbH

Göttingen, Germany

10.5194/amtd-4-1493-2011

On cloud ice induced absorption and polarisation effects in microwave limb sounding

Eriksson

¹ Rydberg

Department of Earth and Space Sciences, Chalmers University of Technology, Gothenburg, Sweden

02 03 2011

4 2 1493 1531

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Detailed simulations of microwave limb sounding in the presence of ice clouds have been performed. It is clarified that, while particle absorption normally gives no significant change of the measured radiance for down-looking measurements, this is not the case for limb sounding. The particles were treated as horizontally aligned oblate spheroids and for this assumption on particle shape, and comparable situations, no significant degree of circular polarisation is generated. Differences between the brightness temperature of the ±45° polarisation components up to 4 K were found, but this difference appears to be small as long as single scattering conditions apply. The cloud extinction is the smallest for the vertically polarised component, but it should be more beneficial to observe any of the ±45° and circularly polarised components if ice water content is also a target of the retrievals. These latter pairs of orthogonal components also make it easier to combine information measured from different positions and with different polarisations. The results indicate that single scattering can be assumed for cloud optical thicknesses below about 0.1, which is thus an important threshold with respect to the complexity and accuracy of retrievals. The representation of particle sizes during the retrieval is discussed.

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