Inclusion of radiosondes data of the Campaign of LBA in the Regional Data Assimilation in CPTEC during October 15 to 29, 2002.
Rosangela
Saher
Cintra, Centro de Previsão de Tempo e Estudos Climáticos - CPTEC/INPE, rcintra@cptec.inpe.br
(Presenting)
Elizabeth
Silvestre
Espinoza, Centro de Previsão de Tempo e Estudos Climáticos - CPTEC/INPE, elizabet@cptec.inpe.br
The analysis system implemented at CPTEC to regional Eta model to give the initial condition using the Regional Physical-space Statistical Analysis System (RPSAS) developed at Global Modeling and Assimilation Office (GMAO), from GSFC/NASA, to improve the skill of this model. The RPSAS has been designed as an incremental improvement over the current Optimal Interpolation (OI) based in Data Assimilation System (DAS). The inclusion of the data from LBA campaign supplies additional support in the knowledge of the true state of the atmosphere in the observations grid of the data assimilation system. A comparison of Observation Data Stream (ODS) and the RPSAS analysis field and the Eta six hour forecast field (first guess) is made and the results were obtained for the period LBA campaign, October 15-29,2002 in southeast of Amazon. The Eta model was integrated daily for the 00, 06, 12 and 18 GMT using as initial condition from analyses of the RPSAS. The statistical indexes were calculated with the purpose of evaluating the quality of the analysis. The observations minus analysis and the observations minus first guess for variables: geopotential height and humidity to levels 850, 500 and 300 hPa were used to generate mean (bias score) and standard deviation (RMS) for each region resulting the statistical evaluating of the observing system from South America. The first results presents the bias score mean for the geopotential height on 500 hPa has amplitude around 16 mgp to 00Z , it has 28 mgp to 06Z, 8 mgp at 12Z and 14 mgp at 18Z.