Static gravity field - anomalies (1)
The GRACE Intermediate Field 48 (GIF48 from UT-CSR) field model is an improved mean gravity field that combines GRACE observations with terrestrial and ocean gravity information for the small-scale features that GRACE alone cannot resolve (from the DTU10 global gravity field). Shown here are the so-called free air gravity deviations from an ideal ellipsoidal Earth model, in units of milli-gal (Note that the gravity field is draped over land and ocean topography to highlight the correlation between gravity and topography). Areas colored yellow, orange, or red are areas where the actual gravity field is larger than the featureless-Earth model predicts, while the progressively darker shades of blue indicate places where the gravity field is less.
[Data Source: ftp://ftp.csr.utexas.edu/pub/grace/GIF48/GIF48.TXT]