A Prototype Quantitative Precipitation Estimation Algorithm for Operational S-Band Polarimetric Radar Utilizing Specific Attenuation and Specific Differential Phase. Part I: Algorithm Description

Wang, Yadong; Cocks, Stephen; Tang, Lin; Ryzhkov, Alexander; Zhang, Pengfei; Zhang, Jian; Howard, Kenneth

doi:10.1175/JHM-D-18-0071.1

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A Prototype Quantitative Precipitation Estimation Algorithm for Operational S-Band Polarimetric Radar Utilizing Specific Attenuation and Specific Differential Phase. Part I: Algorithm Description

2019
By Wang, Yadong ; Cocks, Stephen ; Tang, Lin ; ...
Source: J. Hydrometeor. (2019) 20 (5): 985–997.

[PDF-2.53 MB]

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Journal Title:

Journal of Hydrometeorology
Personal Author:

Wang, Yadong ; Cocks, Stephen ; Tang, Lin ; Ryzhkov, Alexander ; Zhang, Pengfei ; ... More +

Wang, Yadong ; Cocks, Stephen ; Tang, Lin ; Ryzhkov, Alexander ; Zhang, Pengfei ; Zhang, Jian ; Howard, Kenneth Less -
NOAA Program & Office:

NOAA Cooperative Institutes ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) ; OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory)

NOAA Cooperative Institutes ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) ; OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory) Less -
Description:

A prototype quantitative precipitation estimate (QPE) algorithm that utilizes specific attenuation A and specific differential phase KDP was developed for inclusion into the Multi-Radar Multi-Sensor (MRMS) system and the Weather Surveillance Radar-1988 Doppler (WSR-88D) network. Special attention is given to the optimization of the factor α used for computation of a path-integrated attenuation from a total span of differential phase along the propagation path in rain. It is suggested to estimate α from a slope of the ZDR dependence on Z in rain. The use of real-time adjusted α allows us to capture the variations of the drop size distributions, and therefore improve the QPE accuracy. It is demonstrated that the factor α is generally higher for tropical rain type compared to continental rain. Since the R(A) approach is only valid for pure rainfall, the R(KDP) relation is suggested as a complement in areas of hail contamination. The paper contains a description of the basic version of the R(A) and R(KDP) algorithm and recommendations for its further optimization.
Keywords:

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Hydrometeorology Mathematical Models Radar
Source:

J. Hydrometeor. (2019) 20 (5): 985–997.
DOI:

https://doi.org/10.1175/JHM-D-18-0071.1
Document Type:

Journal Article
Funding:

Grant no. NA16OAR4320115
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Submitted
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urn:sha256:e5995a6cff270dfe4659d0fda14d8a53692ccaba35f426f2dd9d58f3c2244beb
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A Prototype Quantitative Precipitation Estimation Algorithm for Operational S-Band Polarimetric Radar Utilizing Specific Attenuation and Specific Differential Phase. Part I: Algorithm Description

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