X-Band Dual-Polarimetric Radar Analyses of Typical Hailstorms over Northern China Based on A Hydrometeor Identification Method — Australian Meteorological and Oceanographic Society
  1. Schedule
  2. Afternoon Tea + Poster Session 2
  3. X-Band Dual-Polarimetric Radar Analyses of Typical Hailstorms over Northern China Based on A Hydrometeor Identification Method

X-Band Dual-Polarimetric Radar Analyses of Typical Hailstorms over Northern China Based on A Hydrometeor Identification Method (#2029)

Yunjun Zhou 1
  1. Chengdu University of Information Technology, Chengdu, SICHUAN, China

Although many studies have focused on the supercell process with large/giant hail, the characteristics of small/wet hail formation in typical hailstorms (non-supercell) over northern China are little known. The mobile X band polarimetric radar (714XDP-A radar) of the Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing (IAP/CAS) is utilized with a modified hydrometeor identification (HID) method [especially applied a new method what named integrated wavelet-denoising (IWD) to control the quality of KDP] to study this typical hailstorm. The results are presented as follows.

1) The IWD method is the best for KDP quality control. The hailfall time and position of hail identification by HID method is coincident with the ground hail observation record, and the distribution of hydrometeor identification in horizontal and vertical is correct and reasonable.

2) The concept model with mature and decayed stages of a cell in this typical hailstorm over northern China is concluded by hydrometeor identification and radar variables (ZH, ZDR and V). The area of hail initial formed (AHIF) exists the mature stage of the cell, it is surrounded by liquid water and high density graupels (HDGs), the height of it is range from 7.5-8.6 km (the environment temperature is around -20℃), the ZH of it is 50-55 dBZ and the V is positive. The hailstone embryos (HDGs) are source from the situ or upper of AHIF instead from the lower of AHIF. And hailstones finally fall along the edge of ZDR column to the rear of cell and weaken the updraft.

This paper focuses on the formation of small/wet hail in microphysical process in the typical hailstorm over northern China, it is important for forecasting and warning hailstones.

 

  1. Aydin K, Zhao Y, Seliga T A. 2009. A differential reflectivity radar hail measurement technique: observations during the Denver hailstorm of 13 June 1984. J Atmos Oceanic Technol, 7: 104-113.
  2. Al-Sakka H, Boumahmoud A A, Fradon B, Frasier S J, Tabary P. 2013. A new fuzzy logic hydrometeor classification scheme applied to the French X-, C-, and S-band polarimetric radars. J Appl Meteor Clim, 52: 2328-2344.
  3. Dolan B and Rutledge S A. 2009. A theory-based hydrometeor identification algorithm for X-band polarimetric radars. J Atmos Oceanic Technol, 26: 2071-2088.
  4. Snyder J C, Bluestein H B, Zhang G, Frasier S J. 2010. Attenuation correction and hydrometeor classification of high-resolution, X-band, dual-polarized mobile radar measurements in severe convective storms. J Atmos Oceanic Technol, 27: 1979-2001.
#AMOS2019