Estimation of Depolarization Ratio Using Weather Radars with Simultaneous Transmission/Reception

Ryzhkov, Alexander; Matrosov, Sergey Y.; Melnikov, Valery; Zrnic, Dusan; Zhang, Pengfei; Cao, Qing; Knight, Michael; Simmer, Clemens; Troemel, Silke

doi:10.1175/JAMC-D-16-0098.1

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Estimation of Depolarization Ratio Using Weather Radars with Simultaneous Transmission/Reception

2017
By Ryzhkov, Alexander ; Matrosov, Sergey Y. ; Melnikov, Valery ; ...
Source: Journal of Applied Meteorology and Climatology, 56(7), 1797–1816

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Journal Title:

Journal of Applied Meteorology and Climatology
Personal Author:

Ryzhkov, Alexander ; Matrosov, Sergey Y. ; Melnikov, Valery ; Zrnic, Dusan ; Zhang, Pengfei ; ... More +

Ryzhkov, Alexander ; Matrosov, Sergey Y. ; Melnikov, Valery ; Zrnic, Dusan ; Zhang, Pengfei ; Cao, Qing ; Knight, Michael ; Simmer, Clemens ; Troemel, Silke Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

A new methodology for estimating the depolarization ratio (DR) by dual-polarization radars with simultaneous transmission/reception of orthogonally polarized waves together with traditionally measured differential reflectivity ZDR, correlation coefficient ρhυ, and differential phase ΦDP in a single mode of operation is suggested. This depolarization ratio can serve as a proxy for circular depolarization ratio measured by radars with circular polarization. The suggested methodology implies the use of a high-power phase shifter to control the system differential phase on transmission and a special signal processing to eliminate the detrimental impact of differential phase on the estimate of DR. The feasibility of the suggested approach has been demonstrated by retrieving DR from the standard polarimetric variables and the raw in-phase I and quadrature Q components of radar signals and by implementing the scheme on a C-band radar with simultaneous transmission/reception of horizontally and vertically polarized waves. Possible practical implications of using DR include the detection of hail and the determination of its size above the melting layer, the discrimination between various habits of ice aloft, and the possible identification and quantification of riming, which is associated with the presence of supercooled cloud water. Some examples of these applications are presented.
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Journal of Applied Meteorology and Climatology, 56(7), 1797–1816
DOI:

https://doi.org/10.1175/JAMC-D-16-0098.1
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Journal Article
Funding:

Grant no. NA11OAR4320072
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urn:sha256:01cb49646cd4557691847e23864acfaecf17e585c9eed28bc3ae1868ef5b86a9
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Estimation of Depolarization Ratio Using Weather Radars with Simultaneous Transmission/Reception

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