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Dataset problem: Issues with hybrid pressure coordinate of MIROC6 (CMIP6) #542

@schlunma

Description

@schlunma

Describe the dataset issue
Bounds of ap and b not set (see #536). The history attribute of ps prevents concatenation.

  • Data file has been changed by you in any way
  • Project (CMIP5/CMIP6/OBS/obs4mips/etc): CMIP6
  • Full dataset description (fill out as many as you know, please):
    • dataset: MIROC6
    • experiment: historical
    • mip: Amon
    • grid: gn
    • version: v20190311
    • variable used: cl
  • Pointer to existing copy of data on ESGF node (it would be very useful if you could provide a physical fullpath to the file(s) that are causing the problem, e.g. on CEDA Jasmin or DKRZ):
    /mnt/lustre02/work/bd0854/DATA/ESMValTool2/CMIP6_DKRZ/CMIP/MIROC/MIROC6/historical/r1i1p1f1/Amon/cl/gn/v20190311/cl_Amon_MIROC6_historical_r1i1p1f1_gn_200001-200912.nc

ncdump (without global attributes):

netcdf cl_Amon_MIROC6_historical_r1i1p1f1_gn_200001-200912 {
dimensions:
        time = UNLIMITED ; // (120 currently)
        lev = 81 ;
        lat = 128 ;
        lon = 256 ;
        bnds = 2 ;
variables:
        double time(time) ;
                time:bounds = "time_bnds" ;
                time:units = "days since 1850-1-1" ;
                time:calendar = "gregorian" ;
                time:axis = "T" ;
                time:long_name = "time" ;
                time:standard_name = "time" ;
        double time_bnds(time, bnds) ;
        double lev(lev) ;
                lev:bounds = "lev_bnds" ;
                lev:units = "1" ;
                lev:axis = "Z" ;
                lev:positive = "down" ;
                lev:long_name = "hybrid sigma pressure coordinate" ;
                lev:standard_name = "atmosphere_hybrid_sigma_pressure_coordinate" ;
                lev:formula = "p = a*p0 + b*ps" ;
                lev:formula_terms = "p0: p0 a: a b: b ps: ps" ;
        double lev_bnds(lev, bnds) ;
                lev_bnds:formula = "p = a*p0 + b*ps" ;
                lev_bnds:standard_name = "atmosphere_hybrid_sigma_pressure_coordinate" ;
                lev_bnds:units = "1" ;
                lev_bnds:formula_terms = "p0: p0 a: a_bnds b: b_bnds ps: ps" ;
        double p0 ;
                p0:long_name = "vertical coordinate formula term: reference pressure" ;
                p0:units = "Pa" ;
        double a(lev) ;
                a:long_name = "vertical coordinate formula term: a(k)" ;
        double b(lev) ;
                b:long_name = "vertical coordinate formula term: b(k)" ;
        float ps(time, lat, lon) ;
                ps:long_name = "Surface Air Pressure" ;
                ps:units = "Pa" ;
                ps:original_units = "hPa" ;
                ps:history = "2019-01-30T04:28:51Z altered by CMOR: Converted units from \'hPa\' to \'Pa\'." ;
        double a_bnds(lev, bnds) ;
                a_bnds:long_name = "vertical coordinate formula term: a(k+1/2)" ;
        double b_bnds(lev, bnds) ;
                b_bnds:long_name = "vertical coordinate formula term: b(k+1/2)" ;
        double lat(lat) ;
                lat:bounds = "lat_bnds" ;
                lat:units = "degrees_north" ;
                lat:axis = "Y" ;
                lat:long_name = "Latitude" ;
                lat:standard_name = "latitude" ;
        double lat_bnds(lat, bnds) ;
        double lon(lon) ;
                lon:bounds = "lon_bnds" ;
                lon:units = "degrees_east" ;
                lon:axis = "X" ;
                lon:long_name = "Longitude" ;
                lon:standard_name = "longitude" ;
        double lon_bnds(lon, bnds) ;
        float cl(time, lev, lat, lon) ;
                cl:standard_name = "cloud_area_fraction_in_atmosphere_layer" ;
                cl:long_name = "Cloud Area Fraction" ;
                cl:comment = "Percentage cloud cover, including both large-scale and convective cloud." ;
                cl:units = "%" ;
                cl:original_name = "CLDFRC" ;
                cl:history = "2019-01-30T04:28:51Z altered by CMOR: Converted units from \'\' to \'%\'. 2019-01-30T04:28:51Z altered by CMOR: replaced missing value flag (-999) with standard missing value (1e+20). 2019-01-30T04:28:52Z altered by CMOR: Inverted axis: lat.
" ;
                cl:cell_methods = "area: time: mean" ;
                cl:cell_measures = "area: areacella" ;
                cl:missing_value = 1.e+20f ;
                cl:_FillValue = 1.e+20f ;

Fix provided in #529.

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