Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/149
Título: An evaluation of the accuracy of models for the determination of the weighted mean temperature of the atmosphere
Autor: Prates, Gonçalo Nuno Delgado
Mendes, V. B.
Santos, L.
Langley, R. B.
Palavras-chave: Sistemas de informação geográfica
Data: 2000
Editora: USA
Citação: Proceedings of the 2000 National Technical Meeting. - USA : Institute of Navigation, 2000. - p.433-439
Resumo: The estimates of the zenith wet delay resulting from the analysis of data from space techniques, such as GPS and VLBI, have a strong potential in climate modeling and weather forecast applications. In order to be useful to meteorology, these estimates have to be converted to precipitable water vapor, a process that requires the knowledge of the weighted mean temperature of the atmosphere, which varies both in space and time. In recent years, several models have been proposed to predict this quantity. Using a database of mean temperature values obtained by ray-tracing radiosonde profiles of more than 100 stations covering the globe, and about 2.5 year’s worth of data, we have analyzed several of these models. Based on data from the European region, we have concluded that the models provide identical levels of precision, but different levels of accuracy. Our results indicate that regionally-optimized models do not provide superior performance compared to the global models.
URI: http://hdl.handle.net/10400.1/149
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