JPL GRACE and GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water Height Coastal Resolution Improvement (CRI) Filtered Release 06.1 Version 03

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 (RL06.1Mv03). This version of the data employs a Coastal Resolution Improvement (CRI) filter that reduces signal leakage errors across coastlines. 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. 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. 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. This RL06.1Mv03 is an updated version of the previous Tellus JPL Mascon RL06Mv02 (DOI, 10.5067/TEMSC-3JC62). RL06.1Mv03 differs from RL06Mv02 only in the Level-1B accelerometer transplant data that is used for the GF2 (GRACE-FO 2) satellite; RL06.1Mv03 uses the ACH data product 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. For a detailed description of the CRI filter implementation, please see Wiese et al., 2016, doi:10.1002/2016WR019344.

Resources

Name Format Description Link
8 GRACE monthly data integration range https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/gracefo/open/docs/GRACE_GRACE-FO_Months_RL06.csv
21 GRACE Mission Information Page https://podaac.jpl.nasa.gov/GRACE
21 Generic Data Readers https://github.com/podaac/data-readers
21 GRACE Tellus Project page for Frequently Asked Questions. https://grace.jpl.nasa.gov/about/faq/
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 Data Use and Citation Policy https://podaac.jpl.nasa.gov/CitingPODAAC
21 HTTPS endpoint for data browse and download https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2536962485-POCLOUD
21 Browse granule search results in Earthdata Search https://search.earthdata.nasa.gov/search/granules?p=C2536962485-POCLOUD
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
32 LAND_MASK.CRI File https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/tellus/open/L3/mascon/docs/LAND_MASK.CRI.nc
32 PLACEMENT file https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/tellus/open/L3/mascon/docs/JPL_MSCNv03_PLACEMENT.nc
32 SCALE_FACTOR File https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/tellus/open/L3/mascon/docs/CLM4.SCALE_FACTOR.JPL.MSCNv03CRI.nc
21 GRACE-FO Mission Information Page https://podaac.jpl.nasa.gov/GRACE-FO
22 Thumbnail https://podaac.jpl.nasa.gov/Podaac/thumbnails/TELLUS_GRAC-GRFO_MASCON_CRI_GRID_RL06_V2.jpg
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FTEMSC-3JC63
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/
33 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. https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/Wiese_2016_WRR.pdf
21 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/. https://grace.jpl.nasa.gov/about/feedback/

Tags

  • climate-indicators
  • gravity-gravitational-field
  • oceans
  • solid-earth
  • atmospheric-ocean-indicators
  • sea-surface-topography
  • earth-science

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