Print Email Facebook Twitter Uncertainty in geocenter estimates in the context of ITRF2014 Title Uncertainty in geocenter estimates in the context of ITRF2014 Author Riddell, Anna R. (University of Tasmania; Geoscience Australia) King, A. Matt (University of Tasmania) Watson, Christopher S. (University of Tasmania) Sun, Y. (TU Delft Laboratory Geoscience and Remote Sensing) Riva, R.E.M. (TU Delft Physical and Space Geodesy) Rietbroek, Roelof (Universität Bonn) Date 2017-05-01 Abstract Uncertainty in the geocenter position and its subsequent motion affects positioning estimates on the surface of the Earth and downstream products such as site velocities, particularly the vertical component. The current version of the International Terrestrial Reference Frame, ITRF2014, derives its origin as the long-term averaged center of mass as sensed by satellite laser ranging (SLR), and by definition, it adopts only linear motion of the origin with uncertainty determined using a white noise process. We compare weekly SLR translations relative to the ITRF2014 origin, with network translations estimated from station displacements from surface mass transport models. We find that the proportion of variance explained in SLR translations by the model-derived translations is on average less than 10%. Time-correlated noise and nonlinear rates, particularly evident in the Y and Z components of the SLR translations with respect to the ITRF2014 origin, are not fully replicated by the model-derived translations. This suggests that translation-related uncertainties are underestimated when a white noise model is adopted and that substantial systematic errors remain in the data defining the ITRF origin. When using a white noise model, we find uncertainties in the rate of SLR X, Y, and Z translations of ±0.03, ±0.03, and ±0.06, respectively, increasing to ±0.13, ±0.17, and ±0.33 (mm/yr, 1 sigma) when a power law and white noise model is adopted. Subject geocenterITRF originnoise analysisreference frametemporal variability To reference this document use: http://resolver.tudelft.nl/uuid:a3b18eca-b7d9-4118-8e02-01866d53587a DOI https://doi.org/10.1002/2016JB013698 Embargo date 2018-01-01 ISSN 2169-9313 Source JGR Solid Earth, 122 (5), 4020-4032 Part of collection Institutional Repository Document type journal article Rights © 2017 Anna R. Riddell, A. Matt King, Christopher S. Watson, Y. Sun, R.E.M. Riva, Roelof Rietbroek Files PDF Riddell_et_al_2017_Journa ... _Earth.pdf 1.27 MB Close viewer /islandora/object/uuid:a3b18eca-b7d9-4118-8e02-01866d53587a/datastream/OBJ/view