netcdf d03/GRACE/GRCTellus.JPL.200204_202501.GLO.RL06.3M.MSCNv04CRI.nc {
  dimensions:
    lon = 720;
    lat = 360;
    time = 241;
    bounds = 2;
  variables:
    double lon(lon=720);
      :units = "degrees_east";
      :long_name = "longitude";
      :standard_name = "longitude";
      :axis = "X";
      :valid_min = 0.25; // double
      :valid_max = 359.75; // double
      :bounds = "lon_bounds";
      :_ChunkSizes = 720U; // uint

    double lat(lat=360);
      :units = "degrees_north";
      :long_name = "latitude";
      :standard_name = "latitude";
      :axis = "Y";
      :valid_min = -89.75; // double
      :valid_max = 89.75; // double
      :bounds = "lat_bounds";
      :_ChunkSizes = 360U; // uint

    double time(time=241);
      :units = "days since 2002-01-01T00:00:00Z";
      :long_name = "time";
      :standard_name = "time";
      :axis = "T";
      :calendar = "gregorian";
      :bounds = "time_bounds";
      :_ChunkSizes = 241U; // uint

    double lwe_thickness(time=241, lat=360, lon=720);
      :_FillValue = -99999.0; // double
      :units = "cm";
      :long_name = "Liquid_Water_Equivalent_Thickness";
      :standard_name = "Liquid_Water_Equivalent_Thickness";
      :coordinates = "time lat lon";
      :grid_mapping = "WGS84";
      :valid_min = -2178.211131754538; // double
      :valid_max = 1039.3883114399182; // double
      :comment = "Coastline Resolution Improvement (CRI) filter is applied";
      :_ChunkSizes = 61U, 90U, 180U; // uint

    double uncertainty(time=241, lat=360, lon=720);
      :_FillValue = -99999.0; // double
      :units = "cm";
      :long_name = "uncertainty";
      :standard_name = "uncertainty";
      :coordinates = "time lat lon";
      :grid_mapping = "WGS84";
      :valid_min = 0.22740321267317315; // double
      :valid_max = 53.34469598560085; // double
      :comment = "1-sigma uncertainty: not for each 0.5 degree grid cell, but for each 3-degree mascon estimate";
      :_ChunkSizes = 61U, 90U, 180U; // uint

    double lat_bounds(lat=360, bounds=2);
      :long_name = "latitude boundaries";
      :units = "degrees_north";
      :comment = "latitude values at the north and south bounds of each pixel";
      :_ChunkSizes = 360U, 2U; // uint

    double lon_bounds(lon=720, bounds=2);
      :long_name = "longitude boundaries";
      :units = "degrees_east";
      :comment = "longitude values at the west and east bounds of each pixel";
      :_ChunkSizes = 720U, 2U; // uint

    double time_bounds(time=241, bounds=2);
      :long_name = "time boundaries";
      :units = "days since 2002-01-01T00:00:00Z";
      :comment = "time bounds for each time value, i.e. the first day and last day included in the monthly solution";
      :_ChunkSizes = 241U, 2U; // uint

    double land_mask(lat=360, lon=720);
      :units = "binary";
      :long_name = "Land_Mask";
      :standard_name = "Land_Mask";
      :coordinates = "lat lon";
      :description = "Land Mask that was used with the CRI filter";
      :_ChunkSizes = 360U, 720U; // uint

    double scale_factor(lat=360, lon=720);
      :_FillValue = -99999.0; // double
      :units = "dimensionless";
      :long_name = "Scale_Factor_CRI";
      :standard_name = "Scale_Factor_CRI";
      :coordinates = "lat lon";
      :valid_min = -99999.0; // double
      :valid_max = 24.133988467789724; // double
      :description = "Gridded scale factors to be used with mascon solution that has the CRI filter applied; based on CLM data from 2002-2009";
      :_ChunkSizes = 360U, 720U; // uint

    double mascon_ID(lat=360, lon=720);
      :units = "dimensionless";
      :long_name = "Mascon_Identifier";
      :standard_name = "Mascon_ID";
      :coordinates = "lat lon";
      :valid_min = 1.0; // double
      :valid_max = 4551.0; // double
      :description = "Mascon identifier mapped to the grid";
      :_ChunkSizes = 360U, 720U; // uint

    double GAD(time=241, lat=360, lon=720);
      :_FillValue = -99999.0; // double
      :units = "cm";
      :long_name = "OCEAN_ATMOSPHERE_DEALIAS_MODEL_(GAD)";
      :standard_name = "OCEAN_ATMOSPHERE_DEALIAS_MODEL_(GAD)";
      :coordinates = "time lat lon";
      :grid_mapping = "WGS84";
      :valid_min = -28.735977100709665; // double
      :valid_max = 46.229601876782745; // double
      :comment = "Coastline Resolution Improvement (CRI) filter is applied";
      :_ChunkSizes = 61U, 90U, 180U; // uint

  // global attributes:
  :Conventions = "CF-1.6, ACDD-1.3, ISO 8601";
  :Metadata_Conventions = "Unidata Dataset Discovery v1.0";
  :standard_name_vocabulary = "NetCDF Climate and Forecast (CF) Metadata Convention-1.6";
  :title = "JPL GRACE and GRACE-FO MASCON RL06.3Mv04 CRI";
  :summary = "Monthly gravity solutions from GRACE and GRACE-FO as determined from the JPL RL06.3Mv04 mascon solution - with CRI filter applied";
  :keywords = "Solid Earth, Geodetics/Gravity, Gravity, liquid_water_equivalent_thickness";
  :keywords_vocabulary = "NASA Global Change Master Directory (GCMD) Science Keywords";
  :platform = "GRACE and GRACE-FO";
  :institution = "NASA/JPL";
  :creator_name = "David Wiese";
  :creator_email = "grace@podaac.jpl.nasa.gov";
  :creator_url = "https://grace.jpl.nasa.gov";
  :creator_type = "group";
  :creator_institution = "NASA/JPL";
  :publisher_name = "Physical Oceanography Distributed Active Archive Center";
  :publisher_email = "podaac@jpl.nasa.gov";
  :publisher_url = "https://podaac.jpl.nasa.gov";
  :publisher_type = "group";
  :publisher_institution = "NASA/JPL";
  :project = "NASA Gravity Recovery and Climate Experiment (GRACE) and NASA Gravity Recovery and Climate Experiment Follow-On (GRACE-FO)";
  :program = "NASA Earth Science System Pathfinder and NASA Earth Systematic Missions Program";
  :id = "10.5067/TEMSC-3JC634";
  :naming_authority = "org.doi.dx";
  :source = "GRACE and GRACE-FO JPL RL06.3Mv04-CRI";
  :processing_level = "2 and 3";
  :acknowledgement = "GRACE is a joint mission of NASA (USA) and DLR (Germany).  GRACE-FO is a joint mission of NASA (USA) and the German Research Center for Geosciences (GFZ).  Use the digital object identifier provided in the id attribute when citing this data.  See https://podaac.jpl.nasa.gov/CitingPODAAC";
  :license = "https://science.nasa.gov/earth-science/earth-science-data/data-information-policy";
  :product_version = "v3.0";
  :time_epoch = "2002-01-01T00:00:00Z";
  :time_coverage_start = "2002-04-16T00:00:00Z";
  :time_coverage_end = "2025-01-16T23:59:59Z";
  :geospatial_lat_min = -89.75; // double
  :geospatial_lat_max = 89.75; // double
  :geospatial_lat_units = "degrees_north";
  :geospatial_lat_resolution = "0.5 degree grid; however the native resolution of the data is 3-degree equal-area mascons";
  :geospatial_lon_min = 0.25; // double
  :geospatial_lon_max = 359.75; // double
  :geospatial_lon_units = "degrees_east";
  :geospatial_lon_resolution = "0.5 degree grid; however the native resolution of the data is 3-degree equal-area mascons";
  :time_mean_removed = "2004.000 to 2009.999";
  :months_missing = "2002-06;2002-07;2003-06;2011-01;2011-06;2012-05;2012-10;2013-03;2013-08;2013-09;2014-02;2014-07;2014-12;2015-06;2015-10;2015-11;2016-04;2016-09;2016-10;2017-02;2017-07;2017-08;2017-09;2017-10;2017-11;2017-12;2018-01;2018-02;2018-03;2018-04;2018-05;2018-08-2018-09";
  :postprocess_1 = " OCEAN_ATMOSPHERE_DEALIAS_MODEL (GAD), MONTHLY_AVE, ADDED BACK TO OCEAN PIXELS ONLY";
  :postprocess_2 = "Water density used to convert to equivalent water height: 1000 kg/m^3";
  :postprocess_3 = "Coastline Resolution Improvement (CRI) filter has been applied to separate land/ocean mass within mascons that span coastlines";
  :GIA_removed = "ICE6G-D; Peltier, W. R., D. F. Argus, and R. Drummond (2018) Comment on the paper by Purcell et al. 2016 entitled An assessment of ICE-6G_C (VM5a) glacial isostatic adjustment model, J. Geophys. Res. Solid Earth, 122.";
  :geocenter_correction = "We use a version of TN-13 based on the JPL mascons";
  :C_20_substitution = "TN-14; Loomis et al., 2019, Geophys. Res. Lett., doi:10.1029/2019GL082929";
  :C_30_substitution = "TN-14; Loomis et al., 2019, Geophys. Res. Lett., doi:10.1029/2019GL082929.  This substitution is made for all months after August 2016.";
  :user_note_1 = "The accelerometer on the GRACE-B spacecraft was turned off after August 2016.  After this date, the accelerometer on GRACE-A was used to derive the non-gravitational accelerations acting on GRACE-B using a transplant procedure.  This has led to a subsequent degradation in the quality of the gravity fields derived.  The uncertainties in this file have been scaled to accomodate this degradation.";
  :user_note_2 = "The accelerometer on the GRACE-D spacecraft began performing sub-optimally after June 21, 2018.  After this date, the accelerometer on GRACE-C is used to derive the non-gravitational accelerations acting on GRACE-D using a transplant procedure.  The uncertainties in the file have been scaled to accomodate this degradation using the current best state of knowledge.";
  :journal_reference = "Watkins, M. M., D. N. Wiese, D.-N. Yuan, C. Boening, and F. W. Landerer (2015) Improved methods for observing Earth\'s time variable mass distribution with GRACE using spherical cap mascons, J. Geophys. Res., 120, doi:10.1002/2014JB011547. ";
  :CRI_filter_journal_reference = "Wiese, D. N., F. W. Landerer, and M. M. Watkins (2016) Quantifying and reducing leakage errors in the JPL RL05M GRACE mascon solution, Water Resour. Res., 52, doi:10.1002/2016WR019344. ";
  :date_created = "2025-03-20T20:03:13Z";
}