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Title: Site distribution and aliasing effects in the inversion for load coefficients and geocenter motion from GPS data
Authors: Wu, Xiaoping
Argus, Donald F.
Heflin, Michael B.
Ivins, Erik R.
Webb, Frank H.
Keywords: Mass transfer
sensitivity analysis
approximation theory
global positioning system
ocean/earth/atmosphere interactions
Issue Date: 27-Dec-2002
Publisher: American Geophysical Union
Citation: Geophysical Research Letters, Vol. 29, No. 24, 2210, doi:10.1029/2002GL016324, 2002
Abstract: Precise GPS measurements of elastic relative site displacements due to surface mass loading offer important constraints on global surface mass transport. We investigate effects of site distribution and aliasing by higher-degree (n greater than or equal 2) loading terms on inversion of GPS data for n = 1 load coefficients and geocenter motion. Covariance and simulation analyses are conducted to assess the sensitivity of the inversion to aliasing and mismodeling errors and possible uncertainties in the n = 1 load coefficient determination. We found that the use of center-of-figure approximation in the inverse formulation could cause 10- 15% errors in the inverted load coefficients. n = 1 load estimates may be contaminated significantly by unknown higher-degree terms, depending on the load scenario and the GPS site distribution. The uncertainty in n = 1 zonal load estimate is at the level of 80 - 95% for two load scenarios.
Appears in Collections:JPL TRS 1992+

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