GRACE NON-TIDAL OCEAN GEOPOTENTIAL COEFFICIENTS JPL RELEASE 6.0 GAB

GRACE NON-TIDAL OCEAN GEOPOTENTIAL COEFFICIENTS JPL RELEASE 6.0 GAB
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DOI10.5067/GRGAB-20J06
Short NameGRACE_GAB_L2_GRAV_JPL_RL06
DescriptionFOR EXPERT USE ONLY. This dataset contains estimates of geopotential field derived from the Gravity Recovery and Climate Experiment (GRACE) mission measurements and a non-tidal oceanic model produced by the Jet Propulsion Laboratory (JPL). The data are in spherical harmonics averaged over approximately a month. The primary objective of the GRACE mission is to obtain accurate estimates of the mean and time-variable components of the gravity field variations. This objective is achieved by making continuous measurements of the change in distance between twin spacecraft, co-orbiting in about 500 km altitude, near circular, polar orbit, spaced approximately 200 km apart, using a microwave ranging system. In addition to these range change, the non-gravitional forces are measured on each satellite using a high accuracy electrostatic, room-temperature accelerometer. The satellite orientation and position (and timing) are precisely measured using twin star cameras and a GPS receiver, respectively. Spatial and temporal variations in the gravity field affect the orbits (or trajectories) of the twin spacecraft differently. These differences are manifested as changes in the distance between the spacecraft, as they orbit the Earth. This change in distance is reflected in the time-of-flight of microwave signals transmitted and received nearly simultaneously between the two spacecraft. The change in this time of fight is continuously measured by tracking the phase of the microwave carrier signals. The so called dual-one-way range change measurements can be reconstructed from these phase measurements. This range change (or its numerically derived derivatives), along with other mission and ancillary data, is subsequently analyzed to extract the parameters of an Earth gravity field model.
Version6.0
Dataset TypeOPEN
MeasurementOceans > Ocean Pressure > Water Pressure
Solid Earth > GRAVITY/GRAVITATIONAL FIELD > Gravity
Processing Level2
CoverageRegion: Global
Northernmost Latitude: 88 degrees
Southernmost Latitude: -88 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 2002-Apr-04 to 2017-Jun-30
ResolutionSpatial Resolution: 500 km (Along) x 500 km (Across)
ProjectionType: Spherical
Detail: N/A
Ellipsoid: WGS 84
Latency hours
Swath Width-1 km
Sample Frequency-
Temporal Repeat (Nominal)1 Month
Temporal Repeat (Min)-
Temporal Repeat (Max)-
Platform/Sensor
GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1 minutes
Inclination Angle: 89 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
GRACE-FO ACC
SENSOR
Name: GRACE-FO SuperSTAR Accelerometer (GRACE-FO ACC)
Swath Width: -1 km
Description: The accelerometer, located at the center of mass of each satellite, measures all non-gravitational forces acting on each satellite. These forces include air drag, solar radiation pressure, and attitude control activator operation.

GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1 minutes
Inclination Angle: 89 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
GRACE SCA
SENSOR
Name: Star Camera Assembly (GRACE SCA)
Swath Width: - km
Description: The two star cameras mounted close to the accelerometer on each satellite provide the precise attitude references for the satellites when making science measurements.

GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1 minutes
Inclination Angle: 89 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
GRACE-FO KBR
SENSOR
Name: GRACE-FO K-Band Ranging System (GRACE-FO KBR)
Swath Width: -1 km
Description: This instrument precisely measures the changes in the separation between the two GRACE satellites using phase tracking of K- and Ka-band signals sent between the two satellites

ProjectGravity Recovery and Climate Experiment (GRACE)
Data ProviderCreator: GRACE
Release Place: JPL PO.DAAC
Release Date: 2018-Jul-05
Resource: https://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/
Keyword(s)gravity, GRACE, GAB, JPL, RL06
Persistent IDPODAAC-GRGAB-20J06
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Announcements
ReleaseNotes_jpl_RL06.pdfhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/ReleaseNotes_jpl_RL06.pdf
Release Notes for GRACE L-2 products - version JPL RL-06
User's Guide
ProdSpecDoc_v4.6.pdfhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/ProdSpecDoc_v4.6.pdf
Product Specification Document
L2-JPL_ProcStds_v6.0.pdfhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/L2-JPL_ProcStds_v6.0.pdf
JPL Level-2 Processing Standards Document For Level-2 Product Release 06
L2-UserHandbook_v4.0.pdfhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/L2-UserHandbook_v4.0.pdf
Level-2 Gravity Field Product User Handbook
Project Materials
GRACE Projecthttps://podaac.jpl.nasa.gov/GRACE
GRACE Mission Page
Citation GRACE. 2018. GRACE NON-TIDAL OCEAN GEOPOTENTIAL COEFFICIENTS JPL RELEASE 6.0 GAB. Ver. 6.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GRGAB-20J06.

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For more information see Data Citations and Acknowledgments.

Journal Reference Bettadpur, S. 2018. Gravity Recovery and Climate Experiment Level-2 Gravity Field Product User Handbook. Center for Space Research at The University of Texas at Austin https://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/L2-UserHandbook_v4.0.pdf