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Description

The monthly ocean bottom pressure anomaly grids are given as equivalent water thickness changes derived from GRACE & GRACE-FO time-variable gravity observations during the specified timespan, and relative to the specified time-mean reference period. The Equivalent water thickness represent 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). The Level-2 GAD product has been added back, 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 (i.e., de-striping and spatial smoothing) have been applied to reduce correlated errors. 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. Data grids are provided in ASCII/netCDF/GeoTIFF formats. For the RL06 version, all GRACE products in the ASCII format have adopted the YAML encoding header, which is in full compliance with the PODAAC metadata best practices.

Product Summary

Platforms
GRACE
Spatial Extent

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

Spatial Resolution
1 Decimal Degrees x 1 Decimal Degrees
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2002-04-04 to 2017-10-25
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
C2077042455-POCLOUD
Data State
COMPLETE
Number of Files/Granules
163
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

NASA/JPL. (2021). JPL TELLUS GRACE Level-3 Monthly Ocean Bottom Pressure Anomaly Release 6.0 version 04 in netCDF/ASCII/GeoTIFF Formats [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/TEOCN-3AJ64 Date Accessed: 2026-02-11

Documents

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

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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