Contrasting polarimetric observations of stratiform riming and non-riming events

Contrasting polarimetric observations of stratiform riming and non-riming events AbstractThis study investigates the how riming in stratiform precipitation impacts polarimetric signatures. Using a vertically pointing Doppler X-band radar, cases can be separated into one of three groups: unrimed to lightly rimed, riming with no bimodal spectra and fall speeds greater than 2.0 m s−1, and riming with bimodal velocity spectra. By averaging polarimetric variables over a 20° by 10 km box near the X-band radar, different signatures were documented for each of the three groups. These polarimetric signatures were then compared to a simplified T-matrix scattering model. ZDR was the one polarimetric variable to consistently vary across all three groups. Unrimed to lightly rimed cases had profiles of polarimetric signatures similar to numerous previous studies. Riming cases without a detectable bimodal spectra had ZDR values on the order of 0.2 dB lower than unrimed to lightly rimed cases, while cases with a bimodal spectra had ZDR values about 0.2 to 0.4 dB higher than unrimed to lightly rimed cases. Both signatures were reproduced using populations of aggregates, dendrites, and needles in the T-matrix scattering model. While these signatures show the potential to identify riming, they are not significantly larger than measurement biases and case-to-case variability to be confidently used without confirmation from other data sources, such as a vertically pointing radar. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Meteorology and Climatology American Meteorological Society

Contrasting polarimetric observations of stratiform riming and non-riming events

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1558-8432
D.O.I.
10.1175/JAMC-D-16-0370.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThis study investigates the how riming in stratiform precipitation impacts polarimetric signatures. Using a vertically pointing Doppler X-band radar, cases can be separated into one of three groups: unrimed to lightly rimed, riming with no bimodal spectra and fall speeds greater than 2.0 m s−1, and riming with bimodal velocity spectra. By averaging polarimetric variables over a 20° by 10 km box near the X-band radar, different signatures were documented for each of the three groups. These polarimetric signatures were then compared to a simplified T-matrix scattering model. ZDR was the one polarimetric variable to consistently vary across all three groups. Unrimed to lightly rimed cases had profiles of polarimetric signatures similar to numerous previous studies. Riming cases without a detectable bimodal spectra had ZDR values on the order of 0.2 dB lower than unrimed to lightly rimed cases, while cases with a bimodal spectra had ZDR values about 0.2 to 0.4 dB higher than unrimed to lightly rimed cases. Both signatures were reproduced using populations of aggregates, dendrites, and needles in the T-matrix scattering model. While these signatures show the potential to identify riming, they are not significantly larger than measurement biases and case-to-case variability to be confidently used without confirmation from other data sources, such as a vertically pointing radar.

Journal

Journal of Applied Meteorology and ClimatologyAmerican Meteorological Society

Published: Dec 15, 2017

References

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