Assimilacao de informacao de radiâncias em modelos de previsao númerica do tempo utilizando um sistema de análise objetiva estatístico em espaco-físico / Assimilation of radiances information in numerical weather prediction model using a physical space statistical analysis system

AUTOR(ES)

Elizabeth Silvestre Espinoza

DATA DE PUBLICAÇÃO

2000

RESUMO

The use of radiances in data assimilations systems can be of two forms: direct assimiliation, or they may be pre-processed to retrieve geophysical parameters, like temperature or humidity for subsequent assimilation. The second process involved the invertion of a radiative transfer equation that is ill-posed, and therefore requires the use of prior information. In this work the variational techniques 1D-Var and 3D-Var are used in order to compare the two process of data assimilation (directly or retrievals)in the South Hemisphere, in the area delimited by 10 degree N to 35 degree S and 35 degree W to 80 degree W. These techniques are implemented and compared in a one-dimensional and three-dimensional assimilation system using simulated data from the TOVS 15 (HISR and MSU)infrared-temperature profiling instruments in relation with the parameters of geopotential and mixing ratio. The analysis error patterns indicated for both 1D-Var and 3D-Var radiance analysis have similar erros than the retrievals case. The computacional cust for the radiance assimilation is also less that the retrieval option.

ASSUNTO(S)

sondagem atmosférica numerical weather forecasting radiância brightness temperature radiance pevisao numérica do tempo artificial satellites satélites artificiais tiros satellite temperatura de brilho assilation assimilacao atmospheric sownding radiative transfer transferência radiativa satélite tiros

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