Comparison of gravimetric excitation functions derived from equivalent water thickness, based on filtered GRACE data sets

• Autorzy: Nagalski T.
• Języki publikacji: EN

Abstrakty

EN

We can estimate the Equivalent Water Thickness (EWT) from results of observations of the Earth gravity field from the Gravity Recovery and Climate Experiment (GRACE) gravimetric mission. However the maps of EWT obtained from raw gravimetric data contain typical stripes. To eliminate these disturbances we need to filter the raw data to improve the signal to noise ratio. The distribution of EWT obtained from the GRACE mission can be used to determine the gravimetric excitation function. In this paper it was investigated the filter influence on the EWT distribution and the amplitude of the gravimetric excitation functions. We use the EWT data sets derived from Stokes coefficients made accessible and filtered by the International Centre for Global Earth Models (ICGEM). The data sets available on ICGEM website were imported from three research centers GFZ, JPL and CSR. The anisotropic filter, with three degrees of smoothing DDK3, DDK2 and DDK1 is described in (Kusche et al., 2009).

Słowa kluczowe

EN

gravimetric excitation function; Equivalent Water Thickness; EWT; Gravity Recovery and Climate Experiment; GRACE

PL

funkcja wzbudzenia grawimetryczna; EWT; GRACE

• Wydawca: Wydział Geodezji i Kartografii Politechniki Warszawskiej
• Czasopismo: Reports on Geodesy
• Rocznik: 2012
• Tom: z. 1/92
• Strony: 201--211
• Opis fizyczny: Bibliogr. 6 poz., rys., wykr.

Twórcy

autor

Nagalski T.

• Space Research Centre, Polish Academy of Sciences, Warsaw, Poland

Bibliografia

• [1] Chambers, D. (2008). Converting release-04 gravity coefficients into maps of equivalent water thickness, Technical report, Center for Space Research,University of Texas.
• [2] Eubanks, T. (1993). Variations in the orientation of the earth in Contributions of Space Geodesy to Geodynamic: Earth Dynamics, volume 24, pages 1–54, American Geophysical Union, Washington, DC.
• [3] Kusche, J. (2007). Approximate decorrelation and non-isotropic smoothing of time-variable GRACE-type gravity field models, Journal of Geodesy 81, 733–749, ISSN 0949-7714, doi:10.1007/s00190-007-0143-3.
• [4] Kusche, J., R. Schmidt, S. Petrovic, R. Rietbroek (2009). Decorrelated GRACE time-variable gravity solutions by GFZ, and their validation using a hydrological model, Journal of Geodesy 83, 903–913, ISSN 0949-7714, doi:10.1007/s00190-009-0308-3.
• [5] Swenson, S., J. Wahr (2006). Post-processing removal of correlated errors in GRACE data, Geophys. Res. Lett. 33, L08402, doi:10.1029/2005GL025285.
• [6] Wahr, J., S. Swenson, I. Velicogna (2006). Accuracy of GRACE mass estimates, Geophys. Res. Lett. 33, L06401, doi:10.1029/2005GL025305.