Sensibilidade do uso de "Pseudo-temps" na assimilação de dados do modelo de circulação geral atmosférica do CPTEC/COLA / Sensitivity using "pseudo-temps" in the data assimilation of the atmospheric global circulation model of the CPTEC/COLA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Using the data assimilation system Physical-space Statistical Analysis System with the Atmospheric Global Circulation Model Pseudo-Temps are used to generate initial conditions to integrate this model. The use of Pseudo-Temps aims to improve the model representation of the atmospheric conditions over South America. In this region there is a lack of radiossondes observations mainly in Bolivia, Paraguay and Peru. The Pseudo-Temps were extracted from the European Centre for Medium range Weather Forecast and from the National Centers for Environmental Predicton analyses. The obtained results were compared with forecasts without Pseudo-Temps, with the reanalysis produced with the South America Low Level Jet Experiment data, and with observed data from South America. Moreover, two synoptic case studies were done presenting the main differences due to the inclusion of the extra data. The results show that there is a positive impact in the model forecasts due to the use Pseudo-Temps. It was also verified that the main improvements occured below 30oS and the forecast range presented a significant increase.

ASSUNTO(S)

meterologia observation system radiossondagem sistema de observação rawindsonde modelagm atmosférica pseudo-temps pseudo-temps data assimilation assimilação de dados numerical weather prediction

ACESSO AO ARTIGO

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