论文信息 - Large‐scale global surface mass variations inferred from GPS measurements of load‐induced deformation

Large‐scale global surface mass variations inferred from GPS measurements of load‐induced deformation

[1] Detrended crustal deformation measurements from a global network of up to 200 continuous Global Positioning System (GPS) tracking sites are inverted for low degree and order (n, m ≤ 6) spherical harmonic series of surface mass variations. An independent geophysical model of the atmosphere, oceans, and water and snow on land is also used to guide the spherical harmonic truncation and to evaluate aliasing errors in the results. Inversion uncertainties decrease significantly as spatial coverage and data quality improve with time, especially in the last few years. Consequently, GPS inverted seasonal geocenter and low degree zonal harmonics converge to those determined by measurements from satellite laser ranging (SLR). Significant n > 1 and non-zonal variations have also been found.

[1] Michael B. Heflin,et al. Site distribution and aliasing effects in the inversion for load coefficients and geocenter motion from GPS data , 2002 .

[2] Ichiro Fukumori,et al. Assimilation of TOPEX/Poseidon altimeter data into a global ocean circulation model: How good are the results? , 1999 .

[3] G. Blewitt,et al. A New Global Mode of Earth Deformation: Seasonal Cycle Detected , 2001, Science.

[4] Byron D. Tapley,et al. Seasonal variations in low degree zonal harmonics of the Earth's gravity field from satellite laser ranging observations , 1999 .

[5] B. Chao,et al. Detection of a Large-Scale Mass Redistribution in the Terrestrial System Since 1998 , 2002, Science.

[6] I. Fukumori,et al. Recent Earth Oblateness Variations: Unraveling Climate and Postglacial Rebound Effects , 2002, Science.

[7] Peter J. Clarke,et al. Inversion of Earth's changing shape to weigh sea level in static equilibrium with surface mass redistribution , 2003 .

[8] J. Zumberge,et al. Comparison of a GPS-defined global reference frame with ITRF2000 , 2002 .

[9] R. Reynolds,et al. The NCEP/NCAR 40-Year Reanalysis Project , 1996, Renewable Energy.

[10] Anny Cazenave,et al. Geocentre motion from the DORIS space system and laser data to the Lageos satellites: comparison with surface loading data , 2000 .

[11] F. Bryan,et al. Time variability of the Earth's gravity field: Hydrological and oceanic effects and their possible detection using GRACE , 1998 .