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Use of Copolar Correlation Coefficient for Probing Precipitation at Nearly Vertical Incidence

Zrnic, Dusan S and Balakrishnan, N and Ryzhkov, Alexander V and Durden, Stephen L (1994) Use of Copolar Correlation Coefficient for Probing Precipitation at Nearly Vertical Incidence. In: IEEE Transactions on Geoscience and Remote Sensing, 32 (4). pp. 740-748.


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We present observations of the copolar correlation coefficient between horizontally and vertically polarized echoes Phv(O) 1. These were made with ground-based and airborne weather radars at nearly vertical incidence. A sharp decrease of I p,,,(O)I occurs at the bright band bottom, and is attributed to a varying mixture of hydrometeors with diverse shape, size, and thermodynamic phase. The largest contribution to decor-relation seems to come from wet aggregates; this is substantiated by consideration of two simple models. One consists of randomly oriented wet prolate spheroids, and the other considers an ensemble of distorted spheres. Prolates with axis ratios of 3 or distorted spheres with rms roughness equal to 15% of the diameter decrease the correlation to 0.8 at S band. At Ku band and for the size range encountered in the bright band, the decrease is a function of equivalent diameter because scattering is in the Mie regime. 1 ph,(o) 1 measurement at 13.8 GHz and from the aircraft are the first ever. Also, differential phase and differential reflectivity at a'10" off nadir are the first of its kind. These last two variables showed a distinct signature in the bright band. This is significant because it might lead to applications on airborne or spaceborne platforms.

Item Type: Journal Article
Publication: IEEE Transactions on Geoscience and Remote Sensing
Publisher: IEEE
Additional Information: ©1994 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Correlation coefficient;Airborne radar
Department/Centre: Division of Interdisciplinary Sciences > Supercomputer Education & Research Centre
Date Deposited: 25 Aug 2008
Last Modified: 11 Jan 2013 10:42
URI: http://eprints.iisc.ac.in/id/eprint/1106

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