Ocean Bottom Pressure Anomalies
The GRACE mission is sensitive to: (1) ocean bottom pressure variations caused by the static part of the atmospheric air pressure; (2) barystatic changes in ocean mass due to an inflow of water from the continents into the ocean basin, and; (3) the redistribution of water within the ocean basins in response to atmospheric surface winds, atmospheric surface pressure gradients, and ocean thermohaline effects (i.e., general ocean circulation).
Please note that the accuracies of GRACE-based results increase when averaged over larger regions, and that spatial leakage of continental signals particularly affects bottom pressure estimates in close proximity to the coast. It is generally advised to average GRACE results over areas of at least 100,000 km².
All three components are provided here as individual data sets, more details on the processing are available from the following paper:
Bergmann, I., Dobslaw, H., 2012:
Short-term transport variability of the Antarctic circumpolar current from satellite gravity observations
Journal of Geophysical Research, 117, C05044 , http://doi.org/10.1029/2012JC007872