JPL GRACE and GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water Height JPL Release 06 Version 02
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| DOI | 10.5067/TEMSC-3MJ62 |
| Short Name | TELLUS_GRAC-GRFO_MASCON_GRID_RL06_V2 |
| Description | This dataset contains gridded monthly global water storage/height anomalies relative to a time-mean, derived from GRACE and GRACE-FO and processed at JPL using the Mascon approach (Version2/RL06). These data are provided in a single data file in netCDF format, and can be used for analysis for ocean, ice, and hydrology phenomena. The water storage/height anomalies are given in equivalent water thickness units (cm). The solution provided here is derived from solving for monthly gravity field variations in terms of geolocated spherical cap mass concentration functions, rather than global spherical harmonic coefficients. Additionally, realistic geophysical information is introduced during the solution inversion to intrinsically remove correlated error. Thus, these Mascon grids do not need to be destriped or smoothed, like traditional spherical harmonic gravity solutions. The complete Mascon solution consists of 4,551 relatively independent estimates of surface mass change that have been derived using an equal-area 3-degree grid of individual mascons. It should be noted that this dataset does not correct for leakage errors across coastlines; it is therefore recommended only for users who want to apply their own algorithm to separate between land and ocean mass very near coastlines. Please refer to the 'Data Access' tab at the top of this page to gain direct access to the Mascon data. For more information, please visit https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/. For a detailed description on the Mascon solution, including the mathematical derivation, implementation of geophysical constraints, and solution validation, please see Watkins et al., 2015, doi: 10.1002/2014JB011547. This product is intended for expert use only; other users are encouraged to use the CRI-filtered Mascon dataset, which is available here: https://podaac.jpl.nasa.gov/dataset/TELLUS_GRACE_MASCON_CRI_GRID_RL06_V2. |
| Version | 2 |
| Dataset Type | OPEN |
| Measurement | SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY ANOMALIES > EQUIVALENT WATER HEIGHT |
| Processing Level | 3 |
| Coverage | Region: Global Northernmost Latitude: 90 degrees Southernmost Latitude: -90 degrees Westernmost Longitude: 0 degrees Easternmost Longitude: 360 degrees Time Span: 2002-Apr-04 to Present |
| Resolution | Spatial Resolution: 0.5 degrees (Latitude) x 0.5 degrees (Longitude) Temporal Resolution: 1 Month |
| Projection | Type: Gridded Detail: Ellipsoid: WGS 84 |
| Latency | 4000 hours |
| 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 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 KBR SENSOR Name: GRACE K-Band Ranging System (GRACE 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 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 ACC SENSOR Name: GRACE SuperSTAR Accelerometer (GRACE 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-FO / Platform Name: Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) 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-FO / Platform Name: Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) 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 GRACE-FO / Platform Name: Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) Orbit Period: -1 minutes Inclination Angle: 89 degrees Ascending Node: 1970-Jan-01 00:00:00 GRACE-FO SCA SENSOR Name: GRACE-FO Star Camera Assembly (GRACE-FO SCA) Swath Width: -1 km Description: The SCA (Star Camera Assembly) consists of three temperature controlled CCD star cameras mounted to the accelerometer, along with the respective baffle assemblies. The STR delivers its video frames to the OBC, which then computes the attitude quaternions. The OBC also acts as the power and command/control interface to the STR. Once switched on and initialized, the STR proceeds with automatic coarse attitude acquisition and then on to fine attitude derivation. |
| Project | Gravity Recovery and Climate Experiment (GRACE) |
| Data Provider | Creator: D. N. Wiese, D.-N. Yuan, C. Boening, F. W. Landerer, M. M. Watkins Release Place: JPL Release Date: 2019-Nov-26 Resource: https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/ |
| Keyword(s) | GRACE, tellus, mascon, water storage, ocean mass, land mass, water height, water mass, mass, land, ocean, gravity, pressure, ocean pressure, ocean bottom pressure, rl06 |
| Persistent ID | PODAAC-TEMSC-3MJ62 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
| PO.DAAC DRIVE | https://podaac-tools.jpl.nasa.gov/drive/files/allData/tellus/L3/mascon/RL06/JPL/v02/non-CRI/netcdf |
| OPENDAP | https://podaac-opendap.jpl.nasa.gov/opendap/allData/tellus/L3/mascon/RL06/JPL/v02/non-CRI/netcdf/ |
| Format (Compression) | NETCDF 4 (NONE) |
| Web Service | https://podaac.jpl.nasa.gov/ws/search/granule/?datasetId=PODAAC-TEMSC-3MJ62 (Search Granule) |
| Tools and Services | |
| LAS | https://podaac-tools.jpl.nasa.gov/las Live Access Server |
| Read Software | |
| Generic netCDF read software. | https://podaac-tools.jpl.nasa.gov/drive/files/common/sw/generic_nc_readers/ Generic netCDF read software provided in IDL, MATLAB, Python, and R. |
| Announcements | |
| Release note for JPL GRACE Mascon | https://podaac-tools.jpl.nasa.gov/drive/files/allData/tellus/L3/docs/GRACE_GRACE-FO_ReleaseNotes_JPL_MASCON.pdf Release Note |
| Grace Tellus Data Release Updates | https://grace.jpl.nasa.gov/data/data-updates/ Grace Tellus Project site for announcing recent and historical updates regarding Tellus datasets. |
| Project Materials | |
| Tellus Mascon Project Page | https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/ Provides additional resources and information for the Global Mascon datasets. |
| Journal References | |
| Wiese et al., 2016 | https://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/Wiese_2016_WRR.pdf For derivations of the CRI filter and gain factors, along with a discussion of leakage errors, please see Wiese et al., 2016, doi:10.1002/2016WR019344. |
| Additional Sites | |
| GRACE Mission Page | https://podaac.jpl.nasa.gov/GRACE GRACE Mission Information Page |
| GRACE-FO Mission Page | https://podaac.jpl.nasa.gov/GRACE-FO |
| Known Issues | |
| GRACE Tellus Feedback Tool | https://grace.jpl.nasa.gov/about/feedback/ GRACE Tellus Project web tool for entering user feedback. Users are advised to only use this tool when submitting data quality issues directly to the GRACE Tellus Project. For all other inquiries, please visit https://podaac.jpl.nasa.gov/forum/. |
| GRACE Data Availability Timetable | https://podaac-tools.jpl.nasa.gov/drive/files/GeodeticsGravity/tellus/L3/docs/GRACE_GRACE-FO_Months_RL06.pdf Contains a timetable of data availability from GRACE for each month starting from the beginning of the GRACE mission. |
| FAQs | |
| Frequently Asked Questions | http://grace.jpl.nasa.gov/about/faq/ GRACE Tellus Project page for Frequently Asked Questions. |
| Citation | D. N. Wiese, D.-N. Yuan, C. Boening, F. W. Landerer, M. M. Watkins. 2019. JPL GRACE and GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water Height JPL Release 06 Version 02. Ver. 2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/TEMSC-3MJ62.
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Watkins, M. M., D. N. Wiese, D.-N. Yuan, C. Boening, F. W. Landerer (2015), Improved methods for observing Earth's time variable mass distribution with GRACE, JGR Solid Earth, 10.1002/2014JB011547. | |||||||
