Quantifying FES2004 S-2 tidal model from multiple space-geodesy techniques, GPS and GRACE, over North West Australia

ISI Document Delivery No.: 498XG Times Cited: 6 Cited Reference Count: 29 Cited References: Davis JL, 2004, GEOPHYS RES LETT, V31, DOI [10.1029/2004GL020892, 10.1029/2004GL021435] FARRELL WE, 1972, REV GEOPHYS SPACE GE, V10, P761, DOI 10.1029/RG010i003p00761 Guo J., 2003, P ION GPS GNSS 2003, P386 Han SC, 2005, GEOPHYS RES LETT, V32, DOI 10.1029/2005GL024296 Khan SA, 2001, GEOPHYS RES LETT, V28, P2249, DOI 10.1029/2000GL011890 King MA, 2008, GEOPHYS RES LETT, V35, DOI 10.1029/2007GL032252 King MA, 2005, J GEOPHYS RES-SOL EA, V110, DOI 10.1029/2004JB003390 Georgiadou Y., 1988, Manuscripta Geodaetica, V13 Kusche J, 2005, J GEOPHYS RES-SOL EA, V110, DOI 10.1029/2004JB003556 Lemoine JM, 2007, ADV SPACE RES, V39, P1620, DOI 10.1016/j.asr.2007.03.062 Lyard F, 2006, OCEAN DYNAM, V56, P394, DOI 10.1007/s10236-006-0086-x McCarthy D, 2003, 32 IERS Melachroinos SA, 2008, J GEODESY, V82, P357, DOI 10.1007/s00190-007-0185-6 PAVLIS N, 1997, 2 INT SCH DET GEOID Penna NT, 2007, J GEOPHYS RES-SOL EA, V112, DOI 10.1029/2005JB004047 PENNA NT, 2002, AUSTR GEOM RES AUS, V77, P1 Press W.H., 1992, NUMERICAL RECIPES FO Ramillien G, 2005, EARTH PLANET SC LETT, V235, P283, DOI [10.1016/j.epsl.2005.04.005, 10.1016/j.espl.2005.04.005] Ray RD, 2003, SPACE SCI REV, V108, P271, DOI 10.1023/A:1026223308107 Ray RD, 2003, ANN GEOPHYS-GERMANY, V21, P1897 Ray RD, 2006, GEOPHYS J INT, V167, P1055, DOI 10.1111/j.1365-246X.2006.03229.x SCARGLE JD, 1982, ASTROPHYS J, V263, P835, DOI 10.1086/160554 Schrama EJO, 2007, J GEOPHYS RES-SOL EA, V112, DOI 10.1029/2006JB004882 Seo KW, 2008, J GEOPHYS RES-SOL EA, V113, DOI 10.1029/2006JB004747 Swenson S, 2006, GEOPHYS RES LETT, V33, DOI 10.1029/2005GL025285 THOMAS DI, 2006, J GEODESY, V81, P359, DOI DOI 10.1007/S00190-006-0118-9 Tregoning P, 2005, GEOPHYS RES LETT, V32, DOI 10.1029/2005GL024104 van Dam T, 2007, J GEOPHYS RES-SOL EA, V112, DOI 10.1029/2006JB004335 Vey S, 2002, J GEODESY, V76, P419, DOI 10.1007/s00190-002-0272-7 Melachroinos, Stavros A. Lemoine, Jean-Michel Tregoning, Paul Biancale, Richard Tregoning, Paul/D-9283-2013 Tregoning, Paul/0000-0001-7192-5391 ARC [DP0877381] We thank N. Penna for installing the GPS system at Broome and for making the data available for this study and the IGS for making the global GPS data available. M. King and two anonymous reviewers are thanked for their insightful comments that helped improve this manuscript. The contribution of P. Tregoning was supported in part by ARC grant DP0877381. Figures were plotted with the GMT software. 6 SPRINGER NEW YORK J GEODESYUnmodeled sub-daily ocean S-2 tide signals that alias into lower frequencies have been detected in the analysis of gravity recovery and climate experiment (GRACE) space gravity fields of GRGS. The most significant global S-2 aliased signal occurs off the northwest coast of Australia in a shallow continental shelf zone, a region with high tidal amplitudes at a period of 161 days. The GRACE S-2 aliased equivalent water height grids are convolved with Green's functions to produce GRACE aliased tidal loading (GATL) vertical displacements. The analysis of hourly global positioning system (GPS) vertical coordinate estimates at permanent sites in the region confirms the presence of spectral power at the S-2 frequency when the same ocean tide model (FES2004) was used. Thus, deficiencies in the FES2004 ocean tide model are detected both directly and indirectly by the two independent space geodetic techniques. Through simulation, the admittance (ratio of amplitude of spurious long-wavelength output signal in the GRACE time-series to amplitude of unmodeled periodic signals) of the GRACE unmodeled S-2 tidal signals, aliased to a 161-day period, is found to have a global average close to 100%, although with substantial spatial variation. Comparing GATL with unmodeled S-2 tidal sub-daily signals in the vertical GPS time-series in the region of Broome in NW Australia suggests an admittance of 110-130%