JPL GRACE and GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water Height Coastal Resolution Improvement (CRI) Filtered Release 06.3 Version 04

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 (RL06.3Mv04). A Coastal Resolution Improvement (CRI) filter has been applied to this data set to reduce signal leakage errors across coastlines. For most land hydrology, oceanographic as well as land-ice applications this is the recommend data set for the analysis of surface mass changes. The data are provided in a single data file in netCDF format, with water storage/height anomalies in equivalent water thickness units (cm). The data are derived from solving for monthly gravity field variations on geolocated spherical cap mass concentration functions, rather than global spherical harmonic coefficients. Additionally, realistic geophysical information is introduced during the computation to intrinsically remove correlated errors. Thus, these Mascon grids do not need to be de-correlated or smoothed, like traditional spherical harmonic gravity solutions.

The complete Mascon solution consists of 4,551 independent estimates of surface mass change that have been derived 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 those mixed land/ocean Mascons to separate land and ocean mass. The land mask used to perform this separation is provided in the same directory as this dataset, as are uncertainty values, and the gridded mascon-ID number to enable further analysis. 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. For use-case examples and further background on the gain factors, please see Wiese, Landerer & Watkins, 2016, https://doi.org/10.1002/2016WR019344.

This RL06.3Mv04 is an updated version of the previous Tellus JPL Mascon RL06.1Mv03 (DOI, 10.5067/TEMSC-3JC63). 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. For a detailed description of the CRI filter implementation, please see Wiese et al., 2016, doi:10.1002/2016WR019344.

Resources

Name Format Description Link
21 SOTO (State Of The Ocean) Visualization (total water storage anomaly) https://soto.podaac.earthdatacloud.nasa.gov/?l=GRACE_Tellus_Liquid_Water_Equivalent_Thickness_Mascon_CRI%2CBlueMarble_ShadedRelief_Bathymetry%2CCoastlines_15m
33 Release Note https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/tellus/open/L3/docs/GRACE_GRACE-FO_ReleaseNotes_JPL_MASCON.pdf
21 Provides additional resources and information for the Global Mascon datasets. https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/
21 GRACE-FO Project Website (external to PO.DAAC) https://podaac.jpl.nasa.gov/GRACE
21 GRACE Tellus Project page for Frequently Asked Questions. https://grace.jpl.nasa.gov/about/faq/
22 Thumbnail https://podaac.jpl.nasa.gov/Podaac/thumbnails/TELLUS_GRAC-GRFO_MASCON_CRI_GRID_RL06.3_V4.jpg
21 Data Use and Citation Policy https://podaac.jpl.nasa.gov/CitingPODAAC
21 Browse granule search results in Earthdata Search https://search.earthdata.nasa.gov/search/granules?p=C3195527175-POCLOUD
21 PODAAC GRACE-FO Project-Page https://podaac.jpl.nasa.gov/GRACE-FO
21 Grace Tellus Project site for announcing recent and historical updates regarding Tellus datasets. https://grace.jpl.nasa.gov/data/data-updates/
21 Python script of converting netCDF4 to GeoTIFF https://github.com/podaac/GRACE
21 RL0.63 Version 4 Release Note https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/gracefo/open/docs/GRACE_GRACE-FO_ReleaseNotes_JPL_MASCON.txt
21 HTTPS endpoint for data browse and download https://cmr.earthdata.nasa.gov/virtual-directory/collections/C3195527175-POCLOUD
21 Page that includes all GRACE-FO Documentation and Technical Notes https://podaac.jpl.nasa.gov/gravity/grace-documentation
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FTEMSC-3JC634

Tags

  • glaciers-ice-sheets
  • cryosphere
  • terrestrial-hydrosphere
  • water-budget
  • earth-science
  • ground-water

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