File(s) under permanent embargo
Geodetic secular velocity errors due to interannual surface loading deformation
journal contribution
posted on 2023-05-18, 19:16 authored by Santamaria-Gomez, A, Memin, AGeodetic vertical velocities derived from data as short as 3 yr are often assumed to be representative of linear deformation over past decades to millennia. We use two decades of surface loading deformation predictions due to variations of atmospheric, oceanic and continental water mass to assess the effect on secular velocities estimated from short time-series. The interannual deformation is time-correlated at most locations over the globe, with the level of correlation depending mostly on the chosen continental water model. Using the most conservative loading model and 5-yr-long time-series, we found median vertical velocity errors of 0.5 mm yr−1 over the continents (0.3 mm yr−1 globally), exceeding 1 mm yr−1 in regions around the southern Tropic. Horizontal velocity errors were seven times smaller. Unless an accurate loading model is available, a decade of continuous data is required in these regions to mitigate the impact of the interannual loading deformation on secular velocities.
History
Publication title
Geophysical Journal InternationalVolume
202Pagination
763-767ISSN
0956-540XDepartment/School
School of Geography, Planning and Spatial SciencesPublisher
Blackwell Publishing LtdPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRights statement
Copyright 2015 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society.Repository Status
- Restricted