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Article

Modeling of the Melting Layer. Part IV: Brightband Bulk Parameterization

Catherine Heyraud 1 , Wanda Szyrmer 1 , Stéphane Laroche 2 , and Isztar Zawadzki 3
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  • 1 Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec, Canada
  • 2 Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, and Meteorological Research Branch, Meteorological Service of Canada, Dorval, Quebec, Canada
  • 3 Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec, Canada
Print Publication:
01 Jun 2008
DOI:
https://doi.org/10.1175/2007JAS2448.1
Page(s):
1991–2001
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Abstract

In this paper a simplified UHF-band backscattering parameterization for individual melting snowflakes is proposed. This parameterization is a function of the density, shape, and melted fraction, and is used here in a brightband bulk modeling study. A 1D bulk model is developed where aggregation and breakup are neglected. Model results are in good agreement with detailed bin-model results and simulate the radar brightband observations well. It is shown the model can be seen as an observation operator that could be introduced into a data assimilation scheme to extract information contained in the radar data measurements.

Corresponding author address: Catherine Heyraud, Dept. of Atmospheric and Oceanic Sciences, McGill University, Montreal QC H3A 2K6, Canada. Email: heyraud@zephyr.meteo.mcgill.ca

Abstract

In this paper a simplified UHF-band backscattering parameterization for individual melting snowflakes is proposed. This parameterization is a function of the density, shape, and melted fraction, and is used here in a brightband bulk modeling study. A 1D bulk model is developed where aggregation and breakup are neglected. Model results are in good agreement with detailed bin-model results and simulate the radar brightband observations well. It is shown the model can be seen as an observation operator that could be introduced into a data assimilation scheme to extract information contained in the radar data measurements.

Corresponding author address: Catherine Heyraud, Dept. of Atmospheric and Oceanic Sciences, McGill University, Montreal QC H3A 2K6, Canada. Email: heyraud@zephyr.meteo.mcgill.ca

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