JPL GRACE Mascon Ocean, Ice, and Hydrology Equivalent Water Height Release 06 Coastal Resolution Improvement (CRI) Filtered Version 1.0

JPL GRACE Mascon Ocean, Ice, and Hydrology Equivalent Water Height Release 06 Coastal Resolution Improvement (CRI) Filtered Version 1.0
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DOI10.5067/TEMSC-3MJC6
Short NameTELLUS_GRACE_MASCON_CRI_GRID_RL06_V1
DescriptionThis dataset represents Version 1 of the JPL GRACE Mascon Equivalent Water Height RL06, providing global water storage anomalies relative to a time-mean of monthly mass grids as derived from GRACE. These data are provided in a single data file in netCDF format and is applicable for ocean, ice, and hydrology. This version of the data employs a Coastal Resolution Improvement (CRI) filter that reduces leakage errors across coastlines. The storage 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 spherical cap mass concentration functions, rather than spherical harmonic coefficients. Additionally, realistic geophysical information is introduced during the solution inversion to intrinsically remove correlated error. Thus, these Mascon solutions 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 estimated using an equal-area 3-degree grid of individual mascon. A subset of these individual mascon span coastlines, and contain mixed land and ocean mass change signals. In a post-processing step, the CRI filter is applied to the complete Mascon solution to separate land and ocean mass from individual mascon that span coastlines. The land mask used to perform this separation is provided in the same directory as this dataset. Since the individual mascon act as an inherent smoother on the gravity field, a set of optional gain factors (for continental hydrology applications) that can be applied to the solution to study mass change signals at sub-mascon resolution is also provided within the same data directory as the Mascon data. 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.
Version1.0
Dataset TypeOPEN
MeasurementSolid Earth > GRAVITY/GRAVITATIONAL FIELD > Gravity
Processing Level3
CoverageRegion: Global
Northernmost Latitude: 90 degrees
Southernmost Latitude: -90 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 2002-Apr-04 to 2017-Jun-29
ResolutionSpatial Resolution: 0.5 degrees (Latitude) x 0.5 degrees (Longitude)
Temporal Resolution: 1 Month
ProjectionType: Gridded
Detail:
Ellipsoid: WGS 84
Latency4000 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-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

ProjectMaking Earth Science Data Records for Use in Research Environments (MEaSUREs)
Data ProviderCreator: D. N. Wiese, D.-N. Yuan, C. Boening, F. W. Landerer, M. M. Watkins
Release Place: JPL
Release Date: 2018-Nov-15
Resource: http://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 IDPODAAC-TEMSC-3MJC6
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Announcements
Grace Tellus Data Release Updateshttps://grace.jpl.nasa.gov/data/data-updates/
Grace Tellus Project site for announcing recent and historical updates regarding Tellus datasets.
Project Materials
GRACE Historical and Current Mission Statushttps://www.csr.utexas.edu/grace/operations/mission_status/
GRACE Mission status is updated weekly and maintained by the Center for Space Research at the University of Texas at Austin.
GRACE Near-Real-Time Orbit Datahttps://www.csr.utexas.edu/grace/ground/
This page is maintained by the Center for Space Research at the University of Texas at Austin.
Tellus Mascon Project Pagehttps://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/
Provides additional resources and information for the Global Mascon datasets.
GRACE Missionhttps://podaac.jpl.nasa.gov/GRACE
GRACE Mission Information Page
Journal References
Wiese et al., 2016https://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.
Known Issues
GRACE Tellus Feedback Toolhttps://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/.
README.txt file for JPL RL06 GRACE Mascon Solutionhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/tellus/L3/mascon/RL06/JPL/README.txt
README File
GRACE Data Availability Timetablehttps://podaac-tools.jpl.nasa.gov/drive/files/allData/tellus/L3/docs/GraceMonths.html
Contains a timetable of data availability from GRACE for each month starting from the beginning of the GRACE mission.
FAQs
Frequently Asked Questionshttps://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. 2018. JPL GRACE Mascon Ocean, Ice, and Hydrology Equivalent Water Height Release 06 Coastal Resolution Improvement (CRI) Filtered Version 1.0. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/TEMSC-3MJC6.

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For more information see Data Citations and Acknowledgments.

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.