Preprints
https://doi.org/10.5194/egusphere-2023-3147
https://doi.org/10.5194/egusphere-2023-3147
16 Jan 2024
 | 16 Jan 2024

Estimating the Snow Density using Collocated Parsivel and MRR Measurements: A Preliminary Study from ICE-POP 2017/2018

Wei-Yu Chang, Yung-Chuan Yang, Chen-Yu Hung, Kwonil Kim, and Gyuwon Lee

Abstract. A new method is developed to derive the hydrometer's bulk density and bulk water fraction from collocated measurements from Micro-Rain Radar (MRR) and Particle Size and Velocity disdrometer (Parsivel). Rigorous particle scattering simulation, namely the T-matrix method, is applied to particle size distribution data of Parsivel to calculate the reflectivity (ZHH). The possible combinations of the particle's ice, air, and water are derived to compare them with the MRR-measured ZHH. The combination of minimum water fraction subsequently determines the bulk density (ρbulk). The proposed method is applied to the data collected from the International Collaborative Experiments for Pyeongchang 2018 Olympic and Paralympic Winter Games (ICE-POP 2018) Projects and its pre-campaign. The estimated was examined by self-evaluation of reflectivity weighted fall velocity (Vz) of MRR and independent comparison of the liquid-equivalent snowfall rate (SR) of collocated Pluvio. The bias values are adequately low (Vz: -0.27~0.14 m s-1, SR: 0.52~0.74 mm hr-1). The correlation coefficient of calculated SR from estimated ρbulk and observed SR from Pluvio can be up to 0.74. The results indicate the capability to derive reliable ρbulk through the proposed method, leveraging the compact and easily deployable designs of MRR and Parsivel. The derived bulk density of the two warm-low cases (28 February and 07 March 2018) shares a similar transition as the systems were decaying. The particles with higher bulk density and bulk water fraction were found in the coastal sites (BKC and GWU: mean ρbulk values are 0.12 to 0.25 g cm-3), typically accompanied by higher liquid-water constituents (mean values of the top 5 % bulk water fraction are 0.33 to 0.50) than the inland sites (YPO and MHS: mean ρbulk values are 0.09 to 0.08 and mean values of the top 5 % bulk water fraction are 0.001 to 0.029) during such synoptic conditions.

Wei-Yu Chang, Yung-Chuan Yang, Chen-Yu Hung, Kwonil Kim, and Gyuwon Lee

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Review of egusphere-2023-3147', Anonymous Referee #1, 14 Feb 2024
  • RC2: 'Comment on egusphere-2023-3147', Anonymous Referee #2, 22 Feb 2024
Wei-Yu Chang, Yung-Chuan Yang, Chen-Yu Hung, Kwonil Kim, and Gyuwon Lee
Wei-Yu Chang, Yung-Chuan Yang, Chen-Yu Hung, Kwonil Kim, and Gyuwon Lee

Viewed

Total article views: 165 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
133 25 7 165 2 3
  • HTML: 133
  • PDF: 25
  • XML: 7
  • Total: 165
  • BibTeX: 2
  • EndNote: 3
Views and downloads (calculated since 16 Jan 2024)
Cumulative views and downloads (calculated since 16 Jan 2024)

Viewed (geographical distribution)

Total article views: 162 (including HTML, PDF, and XML) Thereof 162 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 29 Feb 2024
Download
Short summary
The snow density is derived by collocated MRR and Parsivel from the ICE-POP 2017/2018. The PSD from the Parsivel is applied to the T-matrix backscattering simulation and compared with the ZHH from MRR. The bulk density and bulk water fraction are derived from comparing simulated and calculated ZHH. The retrieved bulk density is validated by comparing the snowfall rate measurements from Pluvio. The consistency of snowfall rate confirms the proposed algorithm.