GRACE NON-TIDAL ATMOSPHERE AND OCEAN GEOPOTENTIAL COEFFICIENTS CSR RELEASE 6.0 GAC
(GRACE_GAC_L2_GRAV_CSR_RL06)| Version | 6.0 |
| Processing Level | 2 |
| Start/Stop Date | 2002-Apr-05 to 2017-Jun-30 |
| Short Name | GRACE_GAC_L2_GRAV_CSR_RL06 |
| Description | FOR 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 and atmospheric model produced by the Center for Space Research (CSR) at University of Texas at Austin. 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. |
| DOI | 10.5067/GRGAC-20C06 |
| Measurement | SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY ANOMALIES OCEANS > OCEAN PRESSURE > OCEAN BOTTOM PRESSURE ATMOSPHERE > ATMOSPHERIC PRESSURE > PRESSURE ANOMALIES |
| Swath Width | -1 km |
| Platform/Sensor | GRACE / Platform Name: Gravity Recovery and Climate Experiment (GRACE) Orbit Period: -1.0 minutes KBR SENSOR Name: K-Band Ranging system (KBR) Swath Width: -1.0 kilometers Description: K-Band Ranging System uses K and Ka-band to measure the separation change between the two satellites. |
| Project | Gravity Recovery and Climate Experiment (GRACE) |
| Data Provider | Publisher: CSR Creator: GRACE Release Place: JPL Release Date: 2018-May-10 Resource: https://grace.jpl.nasa.gov/mission/grace/ |
| Format | ASCII |
| Keyword(s) | Gravity, GRACE, CSR, non-tidal, GAC, RL06, SPHERICAL HARMONIC |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 500 Kilometers x 500 Kilometers Temporal Resolution: Monthly - < Annual Coverage Region: GLOBAL North Bounding Coordinate: 88 degrees South Bounding Coordinate: -88 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2002-Apr-05 to 2017-Jun-30 Granule Time Span: 2002-Apr-05 to 2017-Jun-28Swath Width: -1 km Projection Projection Type: Spherical Projection Detail: N/A Ellipsoid: WGS 84 |
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| us-west-2 | |
| podaac-ops-cumulus-protected/GRACE_GAC_L2_GRAV_CSR_RL06/ | |
| podaac-ops-cumulus-public/GRACE_GAC_L2_GRAV_CSR_RL06/ | |
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| IMPORTANT NOTICE | |
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| GENERAL DOCUMENTATION | |
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| READ-ME | |
| DATA CITATION POLICY | |
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Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
| Citation | GRACE. 2018. GRACE_GAC_L2_GRAV_CSR_RL06. Ver. 6.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GRGAC-20C06
For more information see Data Citations and Acknowledgments.
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| 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://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/docs/L2-UserHandbook_v4.0.pdf . |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 6.0 | GRACE NON-TIDAL ATMOSPHERE AND OCEAN GEOPOTENTIAL COEFFICIENTS CSR RELEASE 6.0 GAC | 2023-02-20 | COMPLETE | 2023-02-20T20:51:00.000Z |
| 5.0 | GRACE NON-TIDAL ATMOSPHERE AND OCEAN GEOPOTENTIAL COEFFICIENTS CSR RELEASE 5.0 GAC | Present | RETIRED. | |
| 4.0 | GRACE Geopotential Spherical Harmonic Coefficients for Ocean and Land Corrections CSR Release 4.0 (GAC) | 2024-05-22 | RETIRED. | 2024-05-22T19:31:00.000Z |
| 2.0 | GRACE Geopotential Spherical Harmonic Coefficients for Ocean and Land Corrections CSR Release 2.0 (GAC) | Present | COMPLETE | |
| 1.0 | GRACE Geopotential Spherical Harmonic Coefficients for Ocean and Land Corrections CSR Release 1.0 (GAC) | 2024-05-22 | RETIRED. | 2024-05-22T19:27:00.000Z |