SciELO - Scientific Electronic Library Online

vol.27 issue1Detecção de descargas elétricas atmosféricas em sistemas convectivos com dados do SIMEPARAnálise do comportamento morfológico e radiativo de um sistema convectivo de mesoescala inferido via imagens de satélite author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Brasileira de Geofísica

Print version ISSN 0102-261X


BOMFIM, Everton Pereira  and  MOLINA, Eder Cassola. Análise da variação dos elementos do campo de gravidade na região do Aqüifero Guarani a partir dos dados GRACE. Rev. Bras. Geof. [online]. 2009, vol.27, n.1, pp.17-34. ISSN 0102-261X.

This work estimates the variation of the gravity field elements in a period of two years and three months - April 2002 to July 2004 - using the GRACE mission data in the Guarani aquifer region; these changes are the sum of all the gravity changes that are caused by variations from mass distribution of the Earth's surface and by the deformation of the solid Earth in response to these mass variations. The solutions have been calculated only from the disturbances of the satellite orbits and do not depend on the gravity data available in the oceanic and continental areas. The calculations of the Earth's gravity field monthly solutions by using the GRACE mission data, considering the spherical harmonics, i.e., the Stokes coefficients, for the global gravity field, up to degree and order 150 (February/2003 to July/2004) and 120 (April, August and November 2002), have been transformed in geoidal height and free-air anomaly grids, with the respective associated errors. A linear 3-D inversion using the residual geoid height supplied the three dimensional density distribution, showing that the use of the GRACE data in investigation of the water mass variability in Guarani aquifer is feasible. A Bouguer anomaly profile, calculated by using the GRACE free-air anomaly and a digital topographic model data, was used in order to estimate the water mass variation in the Guarani aquifer region.

Keywords : Guarani aquifer; geopotential; geoid; GRACE satellites; spherical harmonic; linear inversion.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License