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Description

This data set is produced by the Jet Propulsion Laboratory (JPL) as part of the GRACE-FO (Gravity Recovery and Climate Experiment Follow-On) program and derives the ocean bottom pressure (OBP) anomaly given as equivalent water thickness. These monthly grids are derived from GRACE-FO time-variable gravity observations during the specified timespan, and relative to the specified time-mean reference period. This quantity represents sea floor pressure changes due to the integral effect of ocean and atmosphere processes, including global mean ocean bottom pressure changes (mean ocean mass and mean atmosphere mass over the global oceans). A glacial isostatic adjustment (GIA) correction has been applied, and standard corrections for geocenter (degree-1), C20 (degree-20) and C30 (degree-30) are incorporated. Post-processing filters have been applied to reduce correlated errors. Data grids are provided in ASCII/netCDF/GeoTIFF formats. <br><br>

GRACE-FO was launched on 22 May 2018, and extends the original GRACE mission (2002 – 2017) and expands its legacy of scientific achievements in tracking earth surface mass changes. Version 04 (v04) of the ocean bottom pressure data uses updated and consistent C20 and Geocenter corrections (i.e., Technical Notes TN-14 and TN-13), as well as an ellipsoidal correction to account for the non-spherical shape of the Earth when mapping gravity anomalies to surface mass change. Additionally, this RL06.3 is an updated release of the previous RL06.1. It differs from RL06.1 only in the Level-1B accelerometer transplant data that is used for the GF2 (GRACE-FO 2) satellite; see respective L-2 data descriptions. RL06.3 uses the ACX2-L1B data products. All GRACE-FO RL06.3 Level-3 fields are fully compatible with the GRACE RL06 data.

Product Summary

Platforms
GRACE-FO
Instruments
GRACE-FO MWI ,
GRACE-FO LRI ,
GRACE-FO ACC ,
GRACE-FO SCA
Spatial Extent

N: 89.5 S: -89.5 E: 180 W: -180

Spatial Resolution
1 Decimal Degrees x 1 Decimal Degrees
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2018-05-22
Data Partner
GRACE Tellus, Jet Propulsion Laboratory, NASA (NASA/JPL/GRACE-TELLUS-0001) ,
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C3193304376-POCLOUD
Data State
ACTIVE
Number of Files/Granules
86
Processing Level
3
Published
Updated
Science Keywords
Water Pressure

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

GRACE-FO, F. L. (2024). JPL TELLUS GRACE-FO Level-3 Monthly Ocean Bottom Pressure Anomaly Release 6.3 version 04 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GFOCN-3J634 Date Accessed: 2025-12-14

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
lat latitude value at each pixel degrees_north double N/A -89.5 to 89.5 1
lat_bounds latitude values at the north and south bounds of each pixel degrees_north double N/A N/A 1
lon longitude value at each pixel degrees_east double N/A 0.5 to 359.5 1
lon_bounds longitude values at the west and east bounds of each pixel degrees_east double N/A N/A 1
lwe_thickness none m double -99999 -30 to 30 1
time time days since 2002-01-01T00:00:00 double N/A N/A 1
time_bounds time bounds for each time value, i.e., the first day and last day included in the monthly solution days since 2002-01-01T00:00:00 double N/A N/A 1
uncertainty none m double -99999 -30 to 30 1
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