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Impact of solid Earth tide models on GPS coordinate and tropospheric time series


Watson, CS and Tregonning, P and Coleman, R, Impact of solid Earth tide models on GPS coordinate and tropospheric time series, Geophysical Research Letters, 33, (8) pp. L08306. ISSN 0094-8276 (2006) [Refereed Article]

DOI: doi:10.1029/2005GL025538


Unmodelled sub-daily periodic signals can propagate into time series of daily geodetic coordinates and tropospheric estimates at various different frequencies. Geophysical interpretations of geodetic products, particularly at seasonal timescales, can therefore be affected by poorly modelled signals in the geodetic analysis. In this study, we use two solid Earth tide models (IERS2003 and IERS1992) and analyses of global GPS data to demonstrate how this process occurs. Aliased annual and semi-annual signals are evident in the vertical component of the GPS time series, with the amplitudes increasing as a function of latitude up to approximately 2.0 and 0.4 mm, respectively. Tropospheric zenith delay estimates show differences at the 2 mm level, with a dominant diurnal frequency. These results have significant implications in regard to the geophysical interpretation of GPS time series computed using the outdated IERS1992 model and, more generally, for any mis- or unmodelled periodic signals that affect geodetic sites. Copyright 2006 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Watson, CS (Dr Christopher Watson)
UTAS Author:Coleman, R (Professor Richard Coleman)
ID Code:40645
Year Published:2006
Web of Science® Times Cited:37
Deposited By:Geography and Environmental Studies
Deposited On:2006-08-01
Last Modified:2011-10-06

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