论文信息 - Goddard earth models for oceanographic applications (GEM 10B and IOC)

Goddard earth models for oceanographic applications (GEM 10B and IOC)

Abstract Some important oceanographic results have been obtained with Goddard Earth Models using satellite altimetry. GEM 9 and GEM 10 have been extended through the addition of worldwide GEOS‐3 altimetry to give new solutions, GEM 10B and IOC, fields that are complete in harmonics to degree 36 and 180, respectively. GEM 9 is a field derived solely from satellite tracking observations, whereas GEM 10 is a combination solution containing surface gravimetry. The accuracy of the oceanic geoid for these models has been estimated by using independent altimeter tracks of GEOS‐3. After empirically removing long wavelength orbital errors, residuals of 1.8 m (rms) were obtained for GEM 10, 0.94 m for GEM 10B, while GEM IOC gave 0.75 m. Large discrepancies, as much as 60 mgals, were found when ocean gravimetry anomalies (5° blocks) were compared to altimetry‐derived values. Altimeter values were verified through comparison with anomalies from GEM‐9, yielding an rms difference of only 5 mgals. An estimate of the lon...

[1] C. Wagner. The geoid spectrum from altimetry , 1978 .

[2] C. Rizos,et al. Determination of some dominant parameters of the global dynamic sea surface topography from GEOS-3 altimetry , 1978 .

[3] Francis J. Lerch,et al. Gravity model improvement using GEOS 3 /GEM 9 and 10/. [and Seasat altimetry data] , 1977 .

[4] Francis J. Lerch,et al. Improvement in the geopotential derived from satellite and surface data (GEM 7 and 8) , 1977 .

[5] David E. Smith,et al. Contributions to the National Geodetic Satellite Program by Goddard Space Flight Center , 1976 .

[6] F. Lerch,et al. Goddard Earth Models 5 and 6 , 1974 .

[7] David E. Smith,et al. Gravitational field models for the earth (GEM 1 and 2) , 1972 .

[8] J. Marsh,et al. Global detailed gravimetric geoid , 1979 .

[9] W. M. Kaula. Theory of satellite geodesy , 1966 .