Topic
Disdrometer
About: Disdrometer is a research topic. Over the lifetime, 930 publications have been published within this topic receiving 23092 citations.
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28 Dec 2019
TL;DR: In this article, the accuracy of QPE (quantitative precipitation estimation) will be affected by the attenuation of X-band radar, and can be evaluated precisely from disdrometer observation.
Abstract: Observations acquired from Parsivel2 disdrometer located at the haidian station and X-band dual-polarization radar of IAP (Institute of Atmospheric Physics) were compared and analyzed for the process of severe weather in Beijing on July 20, 2016. The radar reflectivity factor from disdrometer and radar are matched and compared using multiple averaging schemes with different grid sizes in neighboring regions considering the consistency of time and space as well. The accuracy of QPE (quantitative precipitation estimation) will be affected by the attenuation of X-band radar, and can be evaluated precisely from disdrometer observation. In this study, disdrometer was used to obtain the precipitation intensity and reflectivity factor. Based on raindrop size distribution observation and the least square method, a Z/R relation was simulated and applied to QPE calculation, QPE from Z/R relationship of convention and correction, polarization parameters derived, disdrometer observed and from automatic rain gauges were compared and validated. The results show that the corrected QPE were much closer to the Parsivel2 observation, and the QPE from polarization parameter was the optimal one.
3 citations
01 Jan 2015
3 citations
22 Mar 2021
TL;DR: In this paper, drop shapes derived from 2D Video Disdrometer measurements at a ground instrumentation site in Delmarva peninsula, USA were used to compute the S-band radar cross sections (RCS) for horizontal and vertical polarizations for each drop with equi-volume diameter > 2 mm.
Abstract: On 9 September 2019, rain-bands of category-1 Hurricane Dorian passed over a ground instrumentation site in Delmarva peninsula, USA Drop shapes derived from 2D Video Disdrometer measurements at this site were used to compute the S-band radar cross sections (RCS) for horizontal and vertical polarizations for each drop with equi-volume diameter > 2 mm These are combined with RCS for the smaller drops assuming equilibrium shapes Radar reflectivity (Z H ) and differential reflectivity (Z DR ) are calculated for each of the 3 minutes throughout the event which lasted for more than 8 hours These are compared with simultaneous observations from an S-band polarimetric radar 38 km away The comparisons highlight the impact of large amplitude drop oscillations on Z DR
3 citations
TL;DR: In this article, optical disdrometers have been used to observe tephra sedimentation at several volcanoes, but a method for calibrating dis-rometers observations to accurately match corresponding samples has yet to be determined.
3 citations