Accurate Characterization of Winter Precipitation Using Multi-Angle Snowflake Camera, Visual Hull, Advanced Scattering Methods and Polarimetric Radar
Open Access
- 10 June 2016
- journal article
- research article
- Published by MDPI AG in Atmosphere
- Vol. 7 (6), 81
- https://doi.org/10.3390/atmos7060081
Abstract
This article proposes and presents a novel approach to the characterization of winter precipitation and modeling of radar observables through a synergistic use of advanced optical disdrometers for microphysical and geometrical measurements of ice and snow particles (in particular, a multi-angle snowflake camera—MASC), image processing methodology, advanced method-of-moments scattering computations, and state-of-the-art polarimetric radars. The article also describes the newly built and established MASCRAD (MASC + Radar) in-situ measurement site, under the umbrella of CSU-CHILL Radar, as well as the MASCRAD project and 2014/2015 winter campaign. We apply a visual hull method to reconstruct 3D shapes of ice particles based on high-resolution MASC images, and perform “particle-by-particle” scattering computations to obtain polarimetric radar observables. The article also presents and discusses selected illustrative observation data, results, and analyses for three cases with widely-differing meteorological settings that involve contrasting hydrometeor forms. Illustrative results of scattering calculations based on MASC images captured during these events, in comparison with radar data, as well as selected comparative studies of snow habits from MASC, 2D video-disdrometer, and CHILL radar data, are presented, along with the analysis of microphysical characteristics of particles. In the longer term, this work has potential to significantly improve the radar-based quantitative winter-precipitation estimation.Keywords
Funding Information
- National Science Foundation (AGS-1344862)
- Korea Meteorological Administration Research and Development Program (KMIPA2015-1010)
This publication has 40 references indexed in Scilit:
- Polarimetric Signatures above the Melting Layer in Winter Storms: An Observational and Modeling StudyJournal of Applied Meteorology and Climatology, 2013
- Radar Backscattering from Snowflakes: Comparison of Fractal, Aggregate, and Soft Spheroid ModelsJournal of Atmospheric and Oceanic Technology, 2011
- Winter Precipitation Microphysics Characterized by Polarimetric Radar and Video Disdrometer Observations in Central OklahomaJournal of Applied Meteorology and Climatology, 2011
- S-Band Dual-Polarization Radar Observations of Winter StormsJournal of Applied Meteorology and Climatology, 2011
- An Optical Array Instrument for Shape and Fall Velocity Measurements of HydrometeorsJournal of Atmospheric and Oceanic Technology, 2004
- Evaluation of a 45° Slant Quasi-Linear Radar Polarization State for Distinguishing Drizzle Droplets, Pristine Ice Crystals, and Less Regular Ice ParticlesJournal of Atmospheric and Oceanic Technology, 2002
- On the Use of Radar Depolarization Ratios for Estimating Shapes of Ice Hydrometeors in Winter CloudsJournal of Applied Meteorology and Climatology, 2001
- Bulk Hydrometeor Classification and Quantification Using Polarimetric Radar Data: Synthesis of RelationsJournal of Applied Meteorology and Climatology, 2000
- Polarimetric Method for Ice Water Content DeterminationJournal of Applied Meteorology and Climatology, 1998
- Polarimetric radar studies of atmospheric ice particlesIEEE Transactions on Geoscience and Remote Sensing, 1994