A STUDY OF THE CHILEAN VERTICAL NETWORK THROUGH GLOBAL GEOPOTENTIAL MODELS AND THE CNES CLS 2011 GLOBAL MEAN SEA SURFACE

• Autor(a) principal: CASTRO, HENRY MONTECINO
• Data de Publicação: 2014
• Outros Autores: CORDERO, AHARON CUEVAS, DE FREITAS, SÍLVIO ROGÉRIO CORREIA
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Boletim de Ciências Geodésicas
• Texto Completo: https://revistas.ufpr.br/bcg/article/view/36744
• topic: Geociências; Geodésia; Vertical Network; Global Geopotential Models; Mean Dynamic Topography.

Most aspects related to the horizontal component of the Geocentric ReferenceSystem for the Americas (SIRGAS) have been solved. However, in the case of thevertical component there are still aspects of definition, national realizations andcontinental unification still not accomplished. Chile is no exception; due to itsparticular geographic characteristics, a number of tide gauges (TG) had to beinstalled in the coast from which the leveling lines that compose the ChileanVertical Network (CHVN) were established. This study explored the offsets of theCHVN by two different approaches; one geodetic and one oceanographic. In thefirst approach, the offsets were obtained in relation to the following GlobalGeopotential Models (GGM): the satellite-only model (unbiased) GO_CONS_gcf_2_tim_r3 derived from GOCE satellite mission; EGM2008 (combined-biased); and GOEGM08, combining information from the GO_CONS_gcf_2_tim_r3 in long wavelengths (n max ~200) with the mean/short wavelengths of EGM2008 (n>200). In the oceanographic method, we used the CNES CLS 2011 Global Mean Sea surface and EIGEN_GRACE_5C GGM to obtain the values of MDT at the different TG. We also evaluated the CHVN in relation to different GGMs. The results showed consistency between the values obtained by the two methods at the TG of Valparaíso and Puerto Chacabuco. In terms of the evaluation of the GGM, GOEGM08 produced the best results.