Technology of Polarization Diversity Radars for Meteorology

Bringi, V. N.; Hendry, A.W.

doi:10.1007/978-1-935704-15-7_19

Cited by 63 publications

(36 citation statements)

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“…More details can be found in Keenan et al (2007) Bringi and Hendry (1990), and Keeler et al (1984;1989). Mount Stapylton is an operational radar of 18 beamwidth with a range resolution of 250 m and a temporal resolution of 6 min.…”

Section: Methodsmentioning

confidence: 99%

Analysis of a Destructive Wind Storm on 16 November 2008 in Brisbane, Australia

Richter

Peter

Collis

2014

Monthly Weather Review

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During the late afternoon on 16 November 2008 the Brisbane (Queensland, Australia) suburb of ''The Gap'' experienced extensive wind damage caused by an intense local thunderstorm. The CP2 research radar nearby detected near-surface radial velocities exceeding 43 m s 21 above The Gap while hail size reports did not exceed golf ball size, and no tornadoes were reported. The storm environment was characterized by a layer of very moist near-surface air and strong storm-relative low-level flow, whereas the storm-relative winds aloft were weak. While the thermodynamic storm environment contained a range of downdraft-promoting ingredients such as a ;4-km-high melting level above a ;2-km-deep layer with nearly dry-adiabatic lapse rates mostly collocated with dry ambient air, a ;1-km-deep stable layer near the ground would generally lower expectations of destructive surface winds based on the downburst mechanism. Once observed reflectivities exceed 70 dBZ, downdraft cooling due to hail melting and downdraft acceleration based on hail loading are found to likely become nonnegligible forcing mechanisms. The event featured the close proximity of a hydrostatically and dynamically driven mesohigh at the base of the downdraft to a dynamically driven mesolow associated with a low-level circulation. This proximity was instrumental in the anisotropic horizontal acceleration of the nearground outflow and the ultimate strength of the Gap storm surface winds. Weak storm-relative midlevel winds are speculated to have allowed the downdraft to descend close to the low-level circulation, which set up this strong horizontal perturbation pressure gradient.

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Section: Methodsmentioning

confidence: 99%

Analysis of a Destructive Wind Storm on 16 November 2008 in Brisbane, Australia

Richter

Peter

Collis

2014

Monthly Weather Review

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“…In additon, polarimetric techniques have found wide application in the detection of targets in clutter [12][13][14]. The technology of such polarimetric radar systems for meteorology has been reviewed by Bringi and Hendry [ 15], who also describe the main characteristics of 21 such radars existing worldwide. In this paper we present data from three advanced radars: the National Center for Atmospheric Research (NCAR) CP-2 radar located in Boulder, Colorado, USA, the National Severe Storm Laboratory's Cimarron radar located in Cimarron, Okla-homa, USA, and the C-band DLR radar located in Oberpfaffenhofen, Federal Republic of Germany.…”

Section: Introductionmentioning

confidence: 99%

Polarimetric radar signatures of precipitation at S and C-bands

Bringi

Chandrasekar

Meischner³

et al. 1991

IEE Proc. F Radar Signal Process. UK

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Polarimetric radar measurements in precipitation at S-and C-band frequencies are considered. Time series data were obtained from three advanced radars: the National Center for Atmospheric Research (NCAR) CP-2 radar, the National Severe Storms Laboratory's (NSSL) Cimarron radar, and the C-band Poldirad radar operated by the German Aerospace Research Establishment (DLR). Measurements of radar reflectivity, differential reflectivity Z DR, differential propagation phase cjJ DP, and the crosscorrelation between horizontal and vertical polarised waves are derived from time series data in rain, rain mixed with ice, and in the stratiform ice phase of convective storms. Raindrops are modelled as oblate in shape with a gamma form for their size distribution. The gamma parameters (N 0 , D 0 , m) are varied over an entire range encompassing a wide variety of rainfall types. The radar rain measurements are shown to be in good general agreement with the model rain simulations. By combining ZvR and cPvP it is possible to identify regions of mixed particle types, e.g. raindrops and hail, or ice crystals and snowflakes. The differential phase upon backscatter may be identified by examining the range profile of cPvP• giving additional clues as to the type and size of particles responsible for the backscatter.

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“…In contrast, a hybrid dualpolarimetric architecture receives orthogonal linear polarizations, while transmitting circular polarization. The precedent for this architecture may be found in radars used for meteorological purposes [Bringi and Hendry, 1990;Torlaschi and Holt, 1998], and in the early days of radar astronomy. In the 1960s the Moon was illuminated from the Arecibo Observatory by circular polarization, and the lunar backscatter was transformed into coherent linear dual-polarized components.…”

Section: Methodsmentioning

confidence: 99%

The m‐chi decomposition of hybrid dual‐polarimetric radar data with application to lunar craters

et al. 2012

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[1] We introduce a new technique derived from the classical Stokes parameters for analysis of polarimetric radar astronomical data. This decomposition is based on m (the degree of polarization) and chi (the Poincaré ellipticity parameter). Analysis of the crater Byrgius A demonstrates how m-chi can more easily differentiate materials within ejecta deposits and their relative thicknesses. We use Goldschmidt crater to demonstrate how m-chi can differentiate coherent deposits of water ice. Goldschmidt crater floor is found to be consistent with single bounce Bragg scattering suggesting the absence of water ice and further corroborating adsorbed H to mineral grains or an H 2 O frost as plausible explanations for a H 2 O/OH detection by near-infrared instruments.

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Technology of Polarization Diversity Radars for Meteorology

Cited by 63 publications

References 0 publications

Analysis of a Destructive Wind Storm on 16 November 2008 in Brisbane, Australia

Analysis of a Destructive Wind Storm on 16 November 2008 in Brisbane, Australia

Polarimetric radar signatures of precipitation at S and C-bands

The m‐chi decomposition of hybrid dual‐polarimetric radar data with application to lunar craters

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