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Impact of solid Earth tide models on GPS coordinate and tropospheric time series
Author(s) -
Watson C.,
Tregoning P.,
Coleman R.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025538
Subject(s) - global positioning system , solid earth , geodesy , series (stratigraphy) , coordinate time , geology , troposphere , time series , earth (classical element) , meteorology , climatology , environmental science , geophysics , remote sensing , geography , physics , computer science , telecommunications , paleontology , machine learning , mathematical physics
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results have significant implications in regard to the geophysical interpretation of GPS time series computed using the outdated IERS1992 model and, more generally, for any mis‐ or unmodelled periodic signals that affect geodetic sites.