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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-382
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-382
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Oct 2019

Submitted as: research article | 14 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Microwave and submillimeter wave scattering of oriented ice particles

Manfred Brath1, Robin Ekelund2, Patrick Eriksson2, Oliver Lemke1, and Stefan A. Buehler1 Manfred Brath et al.
  • 1Universität Hamburg, Faculty of Mathematics, Informatics and Natural Sciences, Department of Earth Sciences, Meteorological Institute, Hamburg, Germany
  • 2Department of Space, Earth and Environment, Chalmers University of Technology, Gothenburg, Sweden

Abstract. Microwave dual-polarization measurements above 100 GHz are so far sparse, but they consistently show that larger ice hydrometeors tend to deviate from the standard assumption of total random orientation. This conclusion has been derived by conceptual models, while the first detailed simulations, recreating the observed polarization patterns, are presented in this study. The ice particles are assumed to be azimuthally randomly oriented with a fixed but arbitrary tilt angle. The scattering data for azimuthal random orientation is much more complex than for total random orientation. The scattering data of azimuthally randomly oriented particles depends in general on the incidence angle and two scattering angles compared to one angle scattering for total random orientation. The additional tilt angle adds an additional dimension. The simulations are based on the discrete dipol approximation in combination with a self developed orientation averaging approach. Data for two particle habits (51 hexagonal plates and 18 plate aggregates) and 35 frequencies between 1 GHz and 864 GHz were produced. The data is publicly available from Zenodo (https://doi.org/10.5281/zenodo.3463003). This effort is also an essential part of preparing for the upcoming Ice Cloud Imager (ICI), that will perform polarized observations at 243 GHz and 664 GHz, which will deliver new insights about clouds.

Manfred Brath et al.
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Data sets

ARTS Microwave Single Scattering Properties Database (Oriented Particles) M. Brath, R. Ekelund, P. Eriksson, O. Lemke, an S. A. Buehler https://doi.org/10.5281/zenodo.3463003

Supplement to "Microwave and submillimeter wave scattering of oriented ice particles" M. Brath, R. Ekelund, P. Eriksson, O. Lemke, an S. A. Buehler https://doi.org/10.5281/zenodo.3475897

Manfred Brath et al.
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Short summary
Microwave dual-polarization observations consistently show that larger atmospheric ice particles tend to have a preferred orientation. Detailed simulations, recreating the observed polarization patterns, are presented in this study. We provide a publicly available database of microwave and submillimeter wave scattering properties of oriented ice particles.
Microwave dual-polarization observations consistently show that larger atmospheric ice particles...
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