Simulation of polarimetric radar variables in rain at S-, C- and X-band wavelengths

Teschl, Franz; Randeu, Walter; Schönhuber, Michael; Teschl, Reinhard

doi:10.5194/adgeo-16-27-2008

Cited by 22 publications

(7 citation statements)

References 17 publications

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“…Different DSDs produce different liquid water contents and different rainfall rates for a given reflectivity factor value (e.g., Sachidananda and Zrni c 1987;Ryzhkov and Zrni c 1995;Zhang et al 2001). Similarly, for a set of given polarimetric variables, different rainfall rates could be obtained under different DSR assumptions (Zhang et al 2001;Teschl et al 2008). Generally, reflectivity-based QPE algorithms are more sensitive to the variations of DSD, while the polarimetric variablebased algorithms are more sensitive to DSRs (Teschl et al 2008).…”

Section: Rainfall Rate Estimation From Specific Differential Phase Inmentioning

confidence: 98%

“…Similarly, for a set of given polarimetric variables, different rainfall rates could be obtained under different DSR assumptions (Zhang et al 2001;Teschl et al 2008). Generally, reflectivity-based QPE algorithms are more sensitive to the variations of DSD, while the polarimetric variablebased algorithms are more sensitive to DSRs (Teschl et al 2008). Based on observations of 13 typhoon events with 2D video disdrometer (2DVD), CCWL09 found that the DSD and DSR characteristics of heavy rain during typhoons in Taiwan were significantly different from typical maritime or continental precipitation systems.…”

Section: Rainfall Rate Estimation From Specific Differential Phase Inmentioning

confidence: 99%

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C-Band Polarimetric Radar QPE Based on Specific Differential Propagation Phase for Extreme Typhoon Rainfall

Wang

Zhang

Ryzhkov

et al. 2013

Journal of Atmospheric and Oceanic Technology

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To obtain accurate radar quantitative precipitation estimation (QPE) for extreme rainfall events such as land-falling typhoon systems in complex terrain, a new method was developed for C-band polarimetric radars. The new methodology includes a correction method based on vertical profiles of the specific differential propagation phase (VPSDP) for low-level blockage and an optimal relation between rainfall rate (R) and the specific differential phase (K DP ). In the VPSDP-based correction approach, a screening process is applied to K DP fields, where missing or unreliable K DP data from lower tilts caused by severe beam blockage are replaced with K DP data from upper and unblocked tilts. The K DP data from upper tilts are adjusted to account for variations in the vertical profile of K DP . The corrected K DP field is then used for rain-rate estimations. To acquire an accurate QPE result, a new R(K DP ) relation for C-band polarimetric radars was derived through simulations using drop size distribution (DSD) and drop shape relation (DSR) observations from typhoon systems in Taiwan. The VPSDP-based correction method with the new R(K DP ) relation was evaluated using the typhoon cases of Morakot (2009) and Fanapi (2010).

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Section: Rainfall Rate Estimation From Specific Differential Phase Inmentioning

confidence: 98%

Section: Rainfall Rate Estimation From Specific Differential Phase Inmentioning

confidence: 99%

C-Band Polarimetric Radar QPE Based on Specific Differential Propagation Phase for Extreme Typhoon Rainfall

Wang

Zhang

Ryzhkov

et al. 2013

Journal of Atmospheric and Oceanic Technology

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“…The anisotropy of gravityoriented hydrometeors is controlled primarily by their aspect ratio (sometimes called the axis ratio or the ratio of the horizontal to vertical axes). For the largest raindrops this aspect ratio can reach ;2 (Bringi and Chandrasekar 2001), with associated ZDR values from 15 to 17 dB (Teschl et al 2008). Departures from perfectly stable horizontal orientation will dilute the differential reflectivity of anisotropic crystals (Matrosov et al 2005) in a process called flutter.…”

Section: Interpretational Background a Anisotropy Of Hydrometeors: Tmentioning

confidence: 99%

Measurements of Differential Reflectivity in Snowstorms and Warm Season Stratiform Systems

Williams

Smalley

Donovan

et al. 2015

Journal of Applied Meteorology and Climatology

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The organized behavior of differential radar reflectivity (ZDR) is documented in the cold regions of a wide variety of stratiform precipitation types occurring in both winter and summer. The radar targets and attendant cloud microphysical conditions are interpreted within the context of measurements of ice crystal types in laboratory diffusion chambers in which humidity and temperature are both stringently controlled. The overriding operational interest here is in the identification of regions prone to icing hazards with long horizontal paths. Two predominant regimes are identified: category A, which is typified by moderate reflectivity (from 10 to 30 dBZ) and modest 1ZDR values (from 0 to 13 dB) in which both supercooled water and dendritic ice crystals (and oriented aggregates of ice crystals) are present at a mean temperature of 2138C, and category B, which is typified by small reflectivity (from 210 to 110 dBZ) and the largest 1ZDR values (from 13 to 17 dB), in which supercooled water is dilute or absent and both flat-plate and dendritic crystals are likely. The predominant positive values for ZDR in many case studies suggest that the role of an electric field on ice particle orientation is small in comparison with gravity. The absence of robust 1ZDR signatures in the trailing stratiform regions of vigorous summer squall lines may be due both to the infusion of noncrystalline ice particles (i.e., graupel and rimed aggregates) from the leading deep convection and to the effects of the stronger electric fields expected in these situations. These polarimetric measurements and their interpretations underscore the need for the accurate calibration of ZDR.

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“…In a previous study (Teschl et al, 2008), polarimetric radar variables were simulated for S-, C-and X-band wavelengths in order to establish radar rainfall estimators in an alpine region in the form R(K DP ), R(Z H ,Z DR ), and R(K DP ,Z DR ). Drop size distributions of hundreds of 1-min-rain episodes were obtained from 2-D-Video-Distrometer measurements in the mountains and were used as input of the simulation.…”

Section: Rain Rate Estimationmentioning

confidence: 99%

Preliminary evaluation of polarimetric parameters from a new dual-polarization C-band weather radar in an alpine region

2010

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Abstract. The first operational weather radar with dual polarization capabilities was recently installed in Austria. The use of polarimetric radar variables rises several expectations: an increased accuracy of the rain rate estimation compared to standard Z-R relationships, a reliable use of attenuation correction methods, and finally hydrometeor classification. In this study the polarimetric variables of precipitation events are investigated and the operational quality of the parameters is discussed. For the new weather radar also several polarimetric rain rate estimators, which are based on the horizontal polarization radar reflectivity, Z H , the differential reflectivity, Z DR , and the specific differential propagation phase shift, K DP , have been tested. The rain rate estimators are further combined with an attenuation correction scheme. A comparison between radar and rain gauge indicates that Z DR based rain rate algorithms show an improvement over the traditional Z-R estimate. K DP based estimates do not provide reliable results, mainly due to the fact, that the observed K DP parameters are quite noisy. Furthermore the observed rain rates are moderate, where K DP is less significant than in heavy rain.

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Simulation of polarimetric radar variables in rain at S-, C- and X-band wavelengths

Cited by 22 publications

References 17 publications

C-Band Polarimetric Radar QPE Based on Specific Differential Propagation Phase for Extreme Typhoon Rainfall

C-Band Polarimetric Radar QPE Based on Specific Differential Propagation Phase for Extreme Typhoon Rainfall

Measurements of Differential Reflectivity in Snowstorms and Warm Season Stratiform Systems

Preliminary evaluation of polarimetric parameters from a new dual-polarization C-band weather radar in an alpine region

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