HR: 09:25h
AN: G21B-06    [Abstracts]
TI: Towards improving the accuracy of GPS-based global vertical velocity estimates
AU: * Cardellach, E
EM: ecardellach@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 United States
AU: Elosegui, P
EM: pelosegui@ieec.fcr.es
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 United States
AU: Elosegui, P
EM: pelosegui@ieec.fcr.es
AF: Institut d'Estudis Espacials de Catalunya / ICE-CSIC, Ed. Nexus H201 Gran Capita 2-4, Barcelona, 08034 Spain
AU: Davis, J L
EM: jdavis@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 United States
AB: The Global Positioning System (GPS) has demonstrated the ability to measure horizontal motions with sub-mm/yr accuracy. Unfortunately, the accuracy of vertical velocity estimates, particularly global estimates, is significantly poorer, and the effect of some of the GPS error sources on these estimates is not fully understood yet. An improved accuracy of globally-referenced vertical velocity estimates would serve to enhance investigations of a variety of geophysical phenomena of broad scientific interest such as global sea-level and climate change, coastal hazards, surface loading, tectonic deformation, ice mass and geoid variability. In this talk, we will present recent studies leading towards improving the accuracy of global vertical rates with GPS, with especial emphasis on network geometry, reference frame design, global scale factor as well as geophysical modeling of the ionosphere and global isostatic adjustment.
DE: 1206 Crustal movements--interplate (8155)
DE: 1208 Crustal movements--intraplate (8110)
DE: 1229 Reference systems
DE: 1243 Space geodetic surveys
DE: 1247 Terrestrial reference systems
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting