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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2017-67
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
03 May 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Analysis and evaluation of WRF microphysical schemes for deep moist convection over Southeastern South America (SESA) using microwave satellite observations and radiative transfer simulations
Victoria Sol Galligani1,2, Die Wang3, Milagros Alvarez Imaz1,2, Paola Salio1,2,4, and Catherine Prigent3 1Centro de Investigaciones del Mar y la Atmsfera, CONICET-UBA, Buenos Aires, Argentina
2UMI-Instituto Franco Argentino sobre Estudios del Clima y sus Impactos, Buenos Aires, Argentina
3Laboratoire d’Etudes du Rayonnement et de la Matire en Astrophysique (LERMA), CNRS, Observatoire de Paris, Paris, France
4Departamento de Ciencias de la Atmsfera y los Ocanos, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina
Abstract. In the present study, three meteorological events of extreme deep moist convection, characteristic of Southeastern South America (SESA), are considered to conduct a systematic evaluation of the microphysical parameterizations available in the Weather Research and Forecasting (WRF) model by undertaking a direct comparison between satellite-based simulated and observed microwave radiances. A research radiative transfer model, the Atmospheric Radiative Transfer Simulator (ARTS), is coupled with WRF under three different microphysical parameterizations (WSM6, WDM6 and Thompson). Since the main difficulty encountered in the characterization of the microwave scattering signal arises from the complex and variable nature of microphysics properties of frozen hydrometeors, the present study further aims at improving the understanding of their optical properties. The bulk optical properties are computed by integrating the single scattering properties of the Liu (2008) DDA single scattering database across the particle size distributions parametrized by the different WRF schemes in a consistent manner, introducing the equal-mass pproach. The equal mass approach consists in describing the optical properties of the WRF snow and graupel hydrometeors with the optical properties of habits in the DDA database whose dimensions might be different (D'max) but whose mass is conserved. The performance of the radiative transfer simulations is evaluated by comparing the simulations with the available coincident microwave observations up to 190 GHz (with observations from TMI, MHS, and SSMI/S) using the Chi-square test. Good greement is obtained with all observations provided special care is taken to represent the scattering properties of the snow and graupel species.

Citation: Galligani, V. S., Wang, D., Alvarez Imaz, M., Salio, P., and Prigent, C.: Analysis and evaluation of WRF microphysical schemes for deep moist convection over Southeastern South America (SESA) using microwave satellite observations and radiative transfer simulations, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2017-67, in review, 2017.
Victoria Sol Galligani et al.
Victoria Sol Galligani et al.
Victoria Sol Galligani et al.

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Short summary
Three meteorological events with deep convection and severe weather, characteristic of the SESA region, are considered. High resolution models, a powerful tool to study convection, can be operated with different microphysics schemes (predict the development of hydrometeors, their interactions, growth, precipitation). We present a systematic evaluation of the microphysical schemes available in the WRF model by a direct comparison between satellite-based simulated and observed microwave radiances.
Three meteorological events with deep convection and severe weather, characteristic of the SESA...
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