Preprints
https://doi.org/10.5194/amt-2021-257
https://doi.org/10.5194/amt-2021-257

  14 Sep 2021

14 Sep 2021

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

Three-way Calibration Checks Using Ground-Based, Ship-Based and Spaceborne Radars

Alain Protat1, Valentin Louf1, Joshua Soderholm1, Jordan Brook2, and William Ponsonby3 Alain Protat et al.
  • 1Australian Bureau of Meteorology, Melbourne, Australia
  • 2University of Queensland, Brisbane, Australia
  • 3Engineering and Technology Program, CSIRO National Collections and Marine Infrastructure, Hobart, Australia

Abstract. This study uses weather radar observations collected from Research Vessel Investigator to evaluate the Australian weather radar network calibration monitoring technique that uses spaceborne radar observations from the NASA Global Precipitation Mission (GPM). Quantitative operational applications such as rainfall and hail nowcasting require a calibration accuracy of 1 dB for radars of the Australian network covering capital cities. Seven ground-based radars along the coast and the ship-based OceanPOL radar are first calibrated independently using GPM radar overpasses over a 3-month period. The calibration difference between the OceanPOL radar and each of the 7 operational radars is then estimated using collocated, gridded, radar observations to evaluate the accuracy of the GPM technique. For all seven radars the calibration difference with the ship radar lies within ±0.5 dB, therefore fulfilling the 1 dB requirement. This result validates the concept of using the GPM spaceborne radar observations to calibrate national weather radar networks (provided that the spaceborne radar maintains a high calibration accuracy). The analysis of the day-to-day and hourly variability of calibration differences between the OceanPOL and Darwin (Berrimah) radars also demonstrates that quantitative comparisons of gridded radar observations can accurately track daily and hourly calibration differences between pairs of operational radars with overlapping coverage (daily and hourly standard deviations of ~ 0.3 dB and ~ 1 dB, respectively).

Alain Protat et al.

Status: open (until 20 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Alain Protat et al.

Alain Protat et al.

Viewed

Total article views: 82 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
71 9 2 82 1 0
  • HTML: 71
  • PDF: 9
  • XML: 2
  • Total: 82
  • BibTeX: 1
  • EndNote: 0
Views and downloads (calculated since 14 Sep 2021)
Cumulative views and downloads (calculated since 14 Sep 2021)

Viewed (geographical distribution)

Total article views: 82 (including HTML, PDF, and XML) Thereof 82 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 17 Sep 2021
Download
Short summary
This study validates the concept of using the GPM spaceborne radar observations to calibrate national weather radar networks to the accuracy required for operational severe weather applications such as rainfall and hail nowcasting.