JPL GRACE Mascon Ocean, Ice, and Hydrology Equivalent Water Height RL05M.1 CRI Filtered Version 2

JPL GRACE Mascon Ocean, Ice, and Hydrology Equivalent Water Height RL05M.1 CRI Filtered Version 2
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DOI10.5067/TEMSC-2LCR5
Short NameTELLUS_GRACE_MASCON_CRI_GRID_RL05_V2
DescriptionThis dataset represents Version 2 of the JPL GRACE Mascon Equivalent Water Height RL05M.1, 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 mascons. A subset of these individual mascons 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 mascons that span coastlines. The land mask used to perform this separation is provided in the same directory as this dataset. Since the individual mascons 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. A summary of changes and enhancements to Version 2 (compared to Version 1) can be found here: ftp://podaac-ftp.jpl.nasa.gov/allData/tellus/L3/mascon/RL05/JPL/README.txt. As a result of these enhancements, the GRACE Project advises users to no longer continue using the Version 1 Mascon data, and to follow this recommendation we have retired the Version 1 dataset. 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 http://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.
Version2
Dataset TypeOPEN
MeasurementSolid Earth > Geodetics/Gravity > 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-01 to 2017-Oct-01
ResolutionSpatial Resolution: 1 degrees (Latitude) x 1 degrees (Longitude)
Temporal Resolution: 1 Month
ProjectionType: Gridded
Detail:
Ellipsoid: WGS84
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 ACC
SENSOR
Name: GRACE SuperSTAR Accelerometer (GRACE ACC)
Swath Width: - 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 KBR
SENSOR
Name: K-Band Ranging System (GRACE KBR)
Swath Width: - 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: 2016-Apr-29
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
Persistent IDPODAAC-TEMSC-2LCR5
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Direct Access
OPENDAPhttps://podaac-opendap.jpl.nasa.gov/opendap/allData/tellus/L3/mascon/RL05/JPL/CRI/netcdf/
FTPftp://podaac-ftp.jpl.nasa.gov/allData/tellus/L3/mascon/RL05/JPL/CRI/netcdf
Format (Compression)NETCDF (NONE)
Read Software
Generic netCDF read software.ftp://podaac.jpl.nasa.gov/common/sw/generic_nc_readers/
Generic netCDF read software provided in IDL, MATLAB, Python, and R.
Announcements
Grace Tellus Data Release Updateshttp://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 Pagehttp://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/
Provides additional resources and information for the Global Mascon datasets.
GRACE Missionhttp://podaac.jpl.nasa.gov/GRACE
GRACE Mission Information Page
GRACE Historical and Current Mission Statushttp://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 Datahttp://www.csr.utexas.edu/grace/ground/
This page is maintained by the Center for Space Research at the University of Texas at Austin.
Journal References
Wiese et al., 2016ftp://podaac-ftp.jpl.nasa.gov/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
README.txt file for JPL RL05M.1 GRACE Mascon Solutionftp://podaac-ftp.jpl.nasa.gov/allData/tellus/L3/mascon/RL05/JPL/README.txt
README File containing list of changes from Version 1 to Version 2.
GRACE Tellus Feedback Toolhttp://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 Timetableftp://podaac.jpl.nasa.gov/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 Questionshttp://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. 2016. JPL GRACE Mascon Ocean, Ice, and Hydrology Equivalent Water Height RL05M.1 CRI Filtered Version 2. Ver. 2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at http://dx.doi.org/10.5067/TEMSC-2LCR5.

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.