A Theory-Based Hydrometeor Identification Algorithm for X-Band Polarimetric Radars

• DOI: 10.1175/2009jtecha1208.1
• Publication Date: 2009-05-27T21:15:19Z
• Authors: Brenda Dolan; Steven A. Rutledge
• Keywords: Graupel; Weather radar; X band; C band

Abstract Although much work has been done at S band to automatically identify hydrometeors by using polarimetric radar, several challenges are presented when adapting such algorithms X band. At band, attenuation and non-Rayleigh scattering can pose significant problems. This study seeks develop a hydrometeor identification (HID) algorithm for based on theoretical simulations the T-matrix model of seven different types: rain, drizzle, aggregates, pristine ice crystals, low-density graupel, high-density vertical ice. Hail mixed-phase excluded purposes this study. Non-Rayleigh effects explored comparison with S-band simulations. Variable ranges used create one-dimensional fuzzy-logic membership beta functions that form basis new X-band HID. The theory-based HID is applied case from Collaborative Adaptive Sensing Atmosphere (CASA) Integrated Project 1 (IP1) network radars, comparisons made similar data Next Generation Weather Radar (NEXRAD) prototype KOUN. shows promise illustrating bulk types qualitatively agrees analysis A simple reflectivity- temperature-only also both KOUN CASA IP1 reveal benefits polarimetric-based algorithms, especially in classification oriented crystals.