Microwave Absorption Measurements of Melting Spherical and Nonspherical Hydrometeors

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  • 1 Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Measurements were made of the absorption behavior of melting and freezing hydrometeors using resonant cavity perturbation techniques at a wavelength of 2.82 cm. Melting ice spheres with equivalent melted diameters between 1.15 and 2.00 mm exhibit a period of strong absorption during melting as predicted by prior theoretical calculations. However, the measurement magnitude of the absorption peak exceeds the predicted value. Absorption measurements of melting oblate and prolate ice ellipsoids also exhibit enhanced absorption during melting.

Abstract

Measurements were made of the absorption behavior of melting and freezing hydrometeors using resonant cavity perturbation techniques at a wavelength of 2.82 cm. Melting ice spheres with equivalent melted diameters between 1.15 and 2.00 mm exhibit a period of strong absorption during melting as predicted by prior theoretical calculations. However, the measurement magnitude of the absorption peak exceeds the predicted value. Absorption measurements of melting oblate and prolate ice ellipsoids also exhibit enhanced absorption during melting.

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