Preprints
https://doi.org/10.5194/egusphere-2024-3164
https://doi.org/10.5194/egusphere-2024-3164
02 Jan 2025
 | 02 Jan 2025

Simulations of Spectral Polarimetric Variables measured in rain at W-band

Ioanna Tsikoudi, Alessandro Battaglia, Christine Unal, and Eleni Marinou

Abstract. In this work, the T-matrix approach is exploited to produce simulations of spectral polarimetric variables (spectral differential reflectivity, sZDR, spectral differential scattering phase, sδHV and spectral differential correlation coefficient, sρHV) for observations of rain acquired from a slant-looking W-band cloud radar. The spectral polarimetric variables are simulated with two different methodologies, taking into account the instrument noise and the stochastic movement of the raindrops introduced by raindrop oscillations and by turbulence. The simulated results are then compared with rain Doppler spectra observations from a W band millimeter-wavelength radar for moderate rain rate conditions. Two cases, differing in levels of turbulence, are considered. While the comparison of the simulations to the measurements presents a reasonable agreement for equi-volume diameters less than 2.25 mm, large discrepancies are found in the amplitude (but not the position) of the maxima and minima of sZDR and, more mildly, of sδHV. This pinpoints at a general weakness of the raindrops approximation with spheroids for simulating radar backscattering properties at W-band.

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Journal article(s) based on this preprint

29 Sep 2025
Simulations of spectral polarimetric variables measured in rain at W-band
Ioanna Tsikoudi, Alessandro Battaglia, Christine Unal, and Eleni Marinou
Atmos. Meas. Tech., 18, 4857–4870, https://doi.org/10.5194/amt-18-4857-2025,https://doi.org/10.5194/amt-18-4857-2025, 2025
Short summary
Ioanna Tsikoudi, Alessandro Battaglia, Christine Unal, and Eleni Marinou

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3164', Anonymous Referee #1, 27 Jan 2025
    • AC1: 'Reply on RC1', Ioanna Tsikoudi, 16 May 2025
  • RC2: 'Comment on egusphere-2024-3164', Alexander Myagkov, 08 Feb 2025
    • AC2: 'Reply on RC2', Ioanna Tsikoudi, 16 May 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3164', Anonymous Referee #1, 27 Jan 2025
    • AC1: 'Reply on RC1', Ioanna Tsikoudi, 16 May 2025
  • RC2: 'Comment on egusphere-2024-3164', Alexander Myagkov, 08 Feb 2025
    • AC2: 'Reply on RC2', Ioanna Tsikoudi, 16 May 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Ioanna Tsikoudi on behalf of the Authors (10 Jun 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (10 Jun 2025) by Leonie von Terzi
RR by Anonymous Referee #1 (30 Jun 2025)
RR by Alexander Myagkov (06 Jul 2025)
ED: Publish subject to minor revisions (review by editor) (07 Jul 2025) by Leonie von Terzi
AR by Ioanna Tsikoudi on behalf of the Authors (16 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (17 Jul 2025) by Leonie von Terzi
AR by Ioanna Tsikoudi on behalf of the Authors (17 Jul 2025)  Manuscript 

Journal article(s) based on this preprint

29 Sep 2025
Simulations of spectral polarimetric variables measured in rain at W-band
Ioanna Tsikoudi, Alessandro Battaglia, Christine Unal, and Eleni Marinou
Atmos. Meas. Tech., 18, 4857–4870, https://doi.org/10.5194/amt-18-4857-2025,https://doi.org/10.5194/amt-18-4857-2025, 2025
Short summary
Ioanna Tsikoudi, Alessandro Battaglia, Christine Unal, and Eleni Marinou
Ioanna Tsikoudi, Alessandro Battaglia, Christine Unal, and Eleni Marinou

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Short summary
The study simulates spectral polarimetric variables for raindrops as observed by a cloud radar. Raindrops are modelled as oblate spheroids and backscattering properties are computed via the T-matrix method including noise, turbulence and spectral averaging effects. When comparing simulations to measurements, differences on the amplitudes of polarimetric variables are noted. This shows the challenge of using simplified shapes to model raindrop polarimetric variables when moving to mm wavelengths.
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