Site distribution and aliasing effects in the inversion for load coefficients and geocenter motion from GPS data

Details Site distribution and aliasing effects in the inversion for load coefficients and geocenter motion from GPS data Site distribution and aliasing effects in the inversion for load coefficients and geocenter motion from GPS data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x..63w&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 24, pp. 63-1, CiteID 2210, DOI 10.1029/2002GL016324

Physics

Geophysics

12

Geodesy And Gravity: Space Geodetic Surveys, Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions (3339), Global Change: Solid Earth, Mathematical Geophysics: Inverse Theory

Scientific paper

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 >= 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.

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