VieVS User Workshop 7 – 9 September, 2010 Vienna VIE_MOD station corrections Hana Spicakova.

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Presentation transcript:

VieVS User Workshop 7 – 9 September, 2010 Vienna VIE_MOD station corrections Hana Spicakova

VieVS User Workshop 20102

3 Solid Earth tides caused by gravitational forces of the Moon and Sun the radial displacement can reach up to 40 cm during one day the site displacement is modelled according to the IERS Conventions 2003 using multiple h and l parametres employed by Mathews et al. (1995)

VieVS User Workshop Tidal Ocean Loading ocean tides redistribute water mass and cause associated load on the crust - the deformation may reach 4 cm vertical and 5 mm horizontal corrections are computed with 11 main tidal waves the external ocean loading files contain amplitude and phase of the tidal wave in the REN system now we have 5 different models in VieVS VieVS/OTIDE/

VieVS User Workshop Tidal Ocean Loading (comparison) modelreferenceinputresolution TPX07.2Egberg et al. (2002)inverse hydrodynamic solution from T/P altimetry+GRACE 0.25° x 0.25° GOT00Ray (1999)T/P0.5° x 0.5° FES2004Letellier (2004)numerical model0.125° x 0.125° EOT08aSavcenko et al. (2008)Multi-mission altimetry0.125° x 0.125° AG06Andersen (2006)Multi-mission altimetry0.5° x 0.5° DEFAULT

VieVS User Workshop Tidal Atmosphere Loading caused by diurnal heating of the atmosphere (→surface pressure oscillations) the displacement is modelled with two tidal waves, S1 and S2 external file with cosine and sine components for the Up, North, East deformation computed on the basis of the Ponte and Ray (2002) model 2 models in VieVS from L. Petrov ( aplo_s1_s2_noib_1.0x1.0deg.nc) aplo_s1_s2_noib_1.0x1.0deg.nc from T. van Dam VieVS/ATIDE/

VieVS User Workshop Non-tidal atmosphere loading caused by preassure changes due to air mass movements at mid-latitude stations are possible vertical crustal displacements of up to 25 mm we use atmosphere pressure loading time series with a 6 hour resolution provided by Goddard VLBI group which are available on the Web at (Petrov & Boy, 2004) external file contains: station, time, deformation in REN system VieVS/ATM/

VieVS User Workshop Pole tide caused by variations in the geocentric position of the Earth‘s rotational axis → variation in the centrifugal potential the variation of station coordinates can amount to a couple of centimeters over a year the pole path is approximated by a linear trend. The displacement vector is obtained using Love numbers appropriate to the frequency of the pole tide (h=0.6027, l=0.0836)

VieVS User Workshop Thank you for your attention!