High-Resolution Polarimetric Radar Observations of Snow-Generating Cells

High-resolution X-band polarimetric radar data were collected in 19 snowstorms over northern Colorado in early 2013 as part of the Front Range Orographic Storms (FROST) project. In each case, small, vertically erect convective turrets were observed near the echo top. These "generating cells&quo...

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Published in:Journal of applied meteorology and climatology 2014-06, Vol.53 (6), p.1636-1658
Main Authors: Kumjian, Matthew R., Rutledge, Steven A., Rasmussen, Roy M., Kennedy, Patrick C., Dixon, Mike
Format: Article
Language:English
Subjects:
Agglomeration
Aggregation
Cells
Clouds
Cooling
Crystal growth
Crystals
Data processing
Echoes
Enthalpy
Experiments
High resolution
Horizontal polarization
Ice crystals
Instability
Meteorology
Meteors
Polarimetric radar
Polarimetry
Precipitation
Radar
Radar data
Radar reflectivity
Radar tracking
Radiosonde data
Radiosondes
Reflectance
Reflectivity
Snow
Snowstorms
Storms
Studies
Superhigh frequencies
Surveillance
Vertical air currents
Vertical velocities
Wind shear
Winter
X-band
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Rutledge, Steven A.
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Dixon, Mike
description High-resolution X-band polarimetric radar data were collected in 19 snowstorms over northern Colorado in early 2013 as part of the Front Range Orographic Storms (FROST) project. In each case, small, vertically erect convective turrets were observed near the echo top. These "generating cells" are similar to those reported in the literature and are characterized by ~1-km horizontal and vertical dimensions, vertical velocities of 1–2 m s−1, and lifetimes of at least 10min. In some cases, these generating cells are enshrouded by enhanced differential reflectivityZ DR, indicating a "shroud" of pristine crystals enveloping the larger, more isotropic particles. The anticorrelation of radar reflectivity factor at horizontal polarizationZH andZ DRsuggests ongoing aggregation or riming of particles in the core of generating cells. For cases inwhich radiosonde datawere collected, potential instability was found within the layer in which generating cells were observed. The persistence of these layers suggests that radiative effects are important, perhaps by some combination of cloud-top cooling and release of latent enthalpy through depositional and riming growth of particles within the cloud. The implications for the ubiquity of generating cells and their role as a mechanism for ice crystal initiation and growth are discussed.
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The persistence of these layers suggests that radiative effects are important, perhaps by some combination of cloud-top cooling and release of latent enthalpy through depositional and riming growth of particles within the cloud. 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The persistence of these layers suggests that radiative effects are important, perhaps by some combination of cloud-top cooling and release of latent enthalpy through depositional and riming growth of particles within the cloud. The implications for the ubiquity of generating cells and their role as a mechanism for ice crystal initiation and growth are discussed.</abstract><cop>Boston</cop><pub>American Meteorological Society</pub><doi>10.1175/jamc-d-13-0312.1</doi><tpages>23</tpages><oa>free_for_read</oa></addata></record>
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subjects Agglomeration
Aggregation
Cells
Clouds
Cooling
Crystal growth
Crystals
Data processing
Echoes
Enthalpy
Experiments
High resolution
Horizontal polarization
Ice crystals
Instability
Meteorology
Meteors
Polarimetric radar
Polarimetry
Precipitation
Radar
Radar data
Radar reflectivity
Radar tracking
Radiosonde data
Radiosondes
Reflectance
Reflectivity
Snow
Snowstorms
Storms
Studies
Superhigh frequencies
Surveillance
Vertical air currents
Vertical velocities
Wind shear
Winter
X-band
title High-Resolution Polarimetric Radar Observations of Snow-Generating Cells
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