endif where is defined as follows: if the variable identified by variable_id has a time dimension with a “climatology” attribute then suffix = “-clim” else suffix = “” endif and where the precision of the time_range strings is determined by the “frequency” global attribute as specified in Table 2. Table 2: Precision of time labels used in file names. Frequency Precision of time label Notes yr, dec, yrPt “yyyy” Label with the years recorded in the first and last coordinate values. mon, monC “yyyyMM” For “mon”, label with the months recorded in the first and last coordinate values; for “monC” label with the first and last months contributing to the climatology. day “yyyyMMdd” Label with the days recorded in the first and last coordinate values. 6hr, 3hr, 1hr, 1hrCM, 6hrPt, 3hrPt, 1hrPt “yyyyMMddhhmm” Label 1hrCM files with the beginning of the first hour and the end of the last hour contributing to climatology (rounded to the nearest minute); for other frequencies in this category, label with the first and last time-coordinate values (rounded to the nearest minute). subhrPt “yyyyMMddhhmmss” Label with the first and last time-coordinate values (rounded to the nearest second) fx Omit time label This frequency applies to variables that are independent of time (“fixed”). Directory structure template: Directory structure = / / / / / / / / / Note: has the form “vYYYYMMDD” (e.g., “v20160314”), indicating a representative date for the version. Note that files contained in a single subdirectory at the end of the directory path should represent all the available time-samples reported from the simulation; a time-series can be split across several files, but all the files must be found in the same subdirectory. This implies that will not generally be the actual date that all files in the subdirectory were written or published. If multiple activities are listed in the global attribute, the first one is used in the directory structure. Example when there is no sub-experiment: CMIP6/CMIP/NOAA-GFDL/GFDL-CM4/1pctCO2/r1i1p1f1/Amon/tas/gn/v20150322 Example with a sub-experiment: CMIP6/DCPP/CNRM-CERFACS/CNRM-CM6-1/dcppA-hindcast/s1960-r2i1p1f3/day/pr/gn/v20160215 The above directory structure is not the same as CMIP5’s directory structure. Table 3: Quality assurance checks. [Note that “CMIP6 data request” refers to information recorded in the “dreq” xml files.] CMIP6 global attribute CMOR source of global attribute Required attribute? Check that type is Require check against template or CV Check also in file name? activity_id CMIP6_experiment_id.json yes string CV (consistent with experiment_id) no branch_method user input conditionally string no no branch_time_in_child user input conditionally double precision no no branch_time_in_parent user input conditionally double precision no no comment user input no string no no contact user input no string no no Conventions Table 1 yes string CV no creation_date CMOR-generated yes string must be valid date represented as an ISO 8601 date and time string no data_specs_version CMIP6 data request yes string CV no experiment CMIP6_experiment_id.json yes string CV (consistent with experiment_id) no experiment_id user input (drawn from CMIP6_experiment_id.json) yes string CV yes external_variables cell_measure values in CMIP6 data request conditionally string CV (consistent with variable_id and table_id) no forcing_index user input yes integer >0 no no frequency CMIP6 data request yes string CV (consistent with table_id) no further_info_url CMOR-generated, based on other global attributes yes string CV (consistent with several global attributes) no grid user input yes string no no grid_label user input (drawn from CMIP6_grid_label.json) yes string CV yes history user, supplemented by CMOR no string no no initialization_index user input yes integer >0 no no institution CMIP6_institution_id.json yes string CV (consistent with institution_id) no institution_id user input yes string CV (consistent with source_id) no license user input yes string defined structure/format and partially-defined text no mip_era Table 1 yes string CV (= “CMIP6”) no nominal_resolution user input (drawn from CMIP6_nominal_resolution.json) yes string CV no parent_activity_id CMIP6_experiment_id.json conditionally string CV (consistent with parent_experiment_id) no parent_mip_era Table 1 conditionally string CV (= “CMIP6”) no parent_experiment_id CMIP6_experiment_id.json conditionally string CV (consistent with experiment_id) no parent_source_id user input (drawn from CMIP6_source_id.json) conditionally string CV (usually the same as source_id) no parent_time_units user input conditionally string check validity against udunits and the CF calendar CV no parent_variant_label user input conditionally string defined structure/format no physics_index user input yes integer >0 no no product Table 1 yes string CV (=”model-output”) no realization_index user input yes integer >0 no no realm CMIP6 data request yes string CV (consistent with table_id) no references user input no string no no source Constructed from components recorded in CMIP6_source_id.json yes string CV (consistent with source_id) no source_id user input (drawn from CMIP6_source_id.json) yes string CV yes source_type user input (drawn from CMIP6_source_type.json) yes string CV (consistent with experiment_id) no sub_experiment CMIP6_sub_experiment_id.json yes string CV (consistent with sub_experiment_id) no sub_experiment_id user input (drawn from list in CMIP6_sub_experiment_id.json) yes string CV (consistent with experiment_id) yes table_id user input (drawn from CMIP6_table_id.json) yes string CV yes title CMOR-generated (based on, source_id, mip_era, and experiment_id) no string no no tracking_id CMOR-generated uuid with handle prefix from Table 1 yes string defined structure/format no variable_id user input (drawn from CMIP6 data request) yes string CV (consistent with table_id) yes variant_info user input no string no no variant_label CMOR-generated, based on 4 user-provided indices (“ripf”) yes string defined structure/format constructed from indices yes

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