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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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In our paper, we propose a robust and operational algorithm to determine the height of the Fre ezing level that can be applied to either Quasi-Vertical Profiles (QVPs) or Vertical profiles (VPs) of polarimetric radar variables. The algorithm is applied over one year of rainfall events collected by a C-Band operational weather radar located in the UK and validated using measured FLs from radiosonde. The results confirm that the algorithm estimates the FL accurately.
Preprints
https://doi.org/10.5194/amt-2020-375
https://doi.org/10.5194/amt-2020-375

  28 Sep 2020

28 Sep 2020

Review status: this preprint is currently under review for the journal AMT.

Detection of the freezing level with polarimetric weather radar

Daniel Sanchez-Rivas and Miguel Angel Rico-Ramirez Daniel Sanchez-Rivas and Miguel Angel Rico-Ramirez
  • Department of Civil Engineering, University of Bristol, Bristol, BS8 1TR, UK

Abstract. Accurate estimation of the Freezing Level (FL) is essential in radar rainfall estimation to mitigate the bright band enhancement, to classify hydrometeors, to correct for rain-attenuation and to calibrate radar measurements. Here we present a novel and robust FL estimation algorithm that can be applied to either Vertical Profiles (VPs) or Quasi-Vertical Profiles (QVPs) built from operational polarimetric weather radar scans. The algorithm depends only on data collected by the radar itself, and it is based on the detection of strong gradients within the profiles and relies on the combination of several polarimetric variables. The VPs and QVPs of ZH showed a good similarity in the profiles (r ≈ 0.7) even though the QVPs are built from low-elevation angles. The algorithm is applied to one year of rainfall events and validated using measured FLs from radiosonde data. The results demonstrated that combining the profiles of ZH, ΡHV and the gradient of the velocity V showed the best FL estimation performance when using VPs, whereas combining the profiles of ZH, ΡHV and ZDR showed the best FL estimation performance when using QVPs. The VP computed from the gradient of the velocity showed to be extremely valuable in the FL estimation when using VPs. The errors in the FL estimation using either VPs or QVPs are within 250 m.

Daniel Sanchez-Rivas and Miguel Angel Rico-Ramirez

 
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

Daniel Sanchez-Rivas and Miguel Angel Rico-Ramirez

Daniel Sanchez-Rivas and Miguel Angel Rico-Ramirez

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Short summary
In our paper, we propose a robust and operational algorithm to determine the height of the Fre ezing level that can be applied to either Quasi-Vertical Profiles (QVPs) or Vertical profiles (VPs) of polarimetric radar variables. The algorithm is applied over one year of rainfall events collected by a C-Band operational weather radar located in the UK and validated using measured FLs from radiosonde. The results confirm that the algorithm estimates the FL accurately.
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