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Article Type:
Research Article

Characterization of Hydrometeors in Sahelian Convective Systems with an X-Band Radar and Comparison with In Situ Measurements. Part I: Sensitivity of Polarimetric Radar Particle Identification Retrieval and Case Study Evaluation

F. Cazenave * Laboratoire d’étude des Transferts en Hydrologie et Environnement, IRD/Université Grenoble Alpes/CNRS, Grenoble, France

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M. Gosset Geoscience Environnement Toulouse, UMR 5563 CNRS/IRD/UTIII, Observatoire Midi-Pyrénées, Toulouse, France

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M. Kacou Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides,Université Félix Houphouet-Boigny, Ivory Coast

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M. Alcoba Geoscience Environnement Toulouse, UMR 5563 CNRS/IRD/UTIII, Observatoire Midi-Pyrénées, Toulouse, France

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E. Fontaine Laboratoire de Météorologie Physique, Université Blaise Pascal, Aubière, France

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C. Duroure Laboratoire de Météorologie Physique, Université Blaise Pascal, Aubière, France

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B. Dolan Colorado State University, Fort Collins, Colorado

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Print Publication:
01 Feb 2016
DOI:
https://doi.org/10.1175/JAMC-D-15-0013.1
Page(s):
231–249
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Abstract

The particle identification scheme developed by Dolan and Rutledge for X-band polarimetric radar is tested for the first time in Africa and compared with in situ measurements. The data were acquired during the Megha-Tropiques mission algorithm-validation campaign that occurred in Niger in 2010. The radar classification is compared with the in situ observations gathered by an instrumented aircraft for the 13 August 2010 squall-line case. An original approach has been developed for the radar–in situ comparison: it consists of simulating synthetic radar variables from the microphysical-probe information and comparing the two datasets in a common “radar space.” The consistency between the two types of observation is good considering the differences in sampling illustrated in the paper. The time evolution of the hydrometeor types and their relative proportion in the convective and stratiform regions are analyzed. The farther away from the convection one looks, the more aggregation dominates, riming diminishes, and hydrometeors are less dense. Particle identification based on the polarimetric radar will be applied to a 5-yr African dataset in the future.

Corresponding author address: F. Cazenave, UGA, Laboratoire LTHE - UMR 5564 CS 40700, 38058 Grenoble CEDEX 9, France. E-mail: frederic.cazenave@ird.fr

Abstract

The particle identification scheme developed by Dolan and Rutledge for X-band polarimetric radar is tested for the first time in Africa and compared with in situ measurements. The data were acquired during the Megha-Tropiques mission algorithm-validation campaign that occurred in Niger in 2010. The radar classification is compared with the in situ observations gathered by an instrumented aircraft for the 13 August 2010 squall-line case. An original approach has been developed for the radar–in situ comparison: it consists of simulating synthetic radar variables from the microphysical-probe information and comparing the two datasets in a common “radar space.” The consistency between the two types of observation is good considering the differences in sampling illustrated in the paper. The time evolution of the hydrometeor types and their relative proportion in the convective and stratiform regions are analyzed. The farther away from the convection one looks, the more aggregation dominates, riming diminishes, and hydrometeors are less dense. Particle identification based on the polarimetric radar will be applied to a 5-yr African dataset in the future.

Corresponding author address: F. Cazenave, UGA, Laboratoire LTHE - UMR 5564 CS 40700, 38058 Grenoble CEDEX 9, France. E-mail: frederic.cazenave@ird.fr
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