%0 Conference Proceedings
%4 sid.inpe.br/mtc-m19@80/2010/07.21.14.38
%2 sid.inpe.br/mtc-m19@80/2010/07.21.14.38.41
%T Optimization firefly method for weighted ensemble of convective parameterizations: part I: results with a synthetic precipitation field
%D 2010
%A Santos, Ariane Frassoni dos,
%A Freitas, Saulo Ribeiro de,
%A Luz, Eduardo Favero Pacheco da,
%A Velho, Haroldo Fraga de Campos,
%A Gan, Manoel Alonso,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress ariane.frassoni@cptec.inpe.br
%@electronicmailaddress saulo.freitas@cptec.inpe.br
%@electronicmailaddress eduardo.luz@lac.inpe.br
%@electronicmailaddress haroldo@lac.inpe.br
%@electronicmailaddress manoel.gan@cptec.inpe.br
%B The Meeting of the Americas.
%C Foz do Iguaçu
%8 8-12 Aug. 2010
%I AGU
%S Posters
%K convective processes, numerical solutions.
%X An unsolved problem in meteorology is to represent clouds and their collective effects in regional or large scale atmospheric numerical models, since the physical processes of the clouds and their interaction with the environment are not well understood yet. In the atmospheric models with grid spacing around 10 Km or greater the effects of clouds on the atmosphere are represented by convective parameterizations. The inverse problem methodology for parameter estimation is applied to a challenging meteorological phenomenon that causes intense rainfall over South America. The inverse problem is formulated as an optimization problem, where the goal is to apply and to evaluate the Firefly method (FA) as an optimizer for retrieving the weights of the ensemble of convective parameterizations of Grell and Dévényi. The forward problem is addressed by the Coupled Chemistry-Aerosol-Tracer Transport-Brazilian developments on the Regional Atmospheric Modeling System (CCATT-BRAMS), and the ensemble of convective parameterizations is expressed by several methodologies used to parameterize convection. The simulation of convective precipitation associated with South Atlantic Convergence Zone (SACZ) occurred on 21 February 2004 with each parameterization is simulated. A synthetic noiseless field of convective precipitation is computed as a weighted sum of the simulated precipitation fields. The FA method has two important issues: the definition of the variation of light intensity viewed by the fireflies, and the formulation of the attractiveness of the fireflies, determined by its brightness witch it characterizes the evaluation of the objective function. Each firefly represents a five dimension candidate solution and the brightest firefly represents the best set of weights of the convective parameterizations. The algorithm was applied with 20 fireflies and 1000 iterations. The results showed a very good inverse solution, and the retrieved field was in agreement with the synthetic precipitation field.
%@language en
%3 poster_agu_1_ariane.pdf