Ocean Bottom Pressure Variability

Ocean Bottom Pressure (OBP) variability as observed by GRACE/GRACE-FO is an integrated signal from a number of different processes. The following individual components are provided as gridded Level-3 OBP product (available at ISDC for GFZ and COST-G ) and are displayed in the map on the left:

GRACE: Barystatic Sea-Level
Pressure variations due to mass inflow from the continents and deformations of the equipotential surface coincident with mean sea-level due to gravitational attraction of masses at the continents.

GRACE: Residual Circulation
Pressure variations due to the general ocean circulation not represented by the non-tidal de-aliasing model AOD1B; not corrected for spatial leakage.

GRACE: Spatial Leakage
Bottom pressure variations likely caused by spatial leakage; intended as optional correction for the residual circulation component.

GRACE: Barystatic Sea-Level Uncertainty
Spatially variable, temporally constant component of the uncertainty estimate for the GRACE-based barystatic sea-level variability, given as standard deviation.

GRACE: Residual Circulation Uncertainty
Time-variable component of the uncertainty estimate for the GRACE-based residual circulation variability, given as standard deviation.

Model: Atmospheric Mass
Static contribution of atmospheric mass to ocean bottom pressure as represented in the non-tidal de-aliasing model AOD1B.

Model: Ocean Circulation
Dynamic ocean component of ocean bottom pressure as represented in the non-tidal de-aliasing model AOD1B.

Globally averaged values as well as averages over predefined regions (click on the map to select a region) of these components are displayed in the time series plot below. The predefined regions represent areas with similar characteristics based on an ocean model. The averaged time series are provided as CSV files (see download link above plot).

Further information on the applied processing scheme and data products is available here as technical note.

Contact: Henryk Dobslaw (dobslaw (at) gfz-potsdam.de)