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For pressure level data the model output is available on the pressure levels according to the table below. Note that since the model output is standardised all models produce the data on the same pressure levels. I SAW WE WILL HAVE ALSO 3-HOURLY DATA, TEY THEY ALL WILL BE SINGLE LEVEL FIELDS?
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Each modelling centre typically run the same experiment using the same model with slightly different settings several times to confirm the robustness of results and inform sensitivity studies through the generation of statistical information. A model and its collection of runs is referred to as an ensemble. Within these ensembles, four different categories of sensitivity studies are done, and the resulting individual model runs are labelled by four integers indexing the experiments in each category
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I AM WONDERING, IF THE ESGF LONG NAMES CAN BE ALSO INSERTED INTO THE TABLE? I THINK, IT WOULD BE USEFUL TO AVOID ANY CONFUSION! MAYBE WE CAN ALSO INDICATE THE TIME-INDEPENDENT FIELDS (THERE ARE QUITE A FEW). THE RED VARIABLES ARE THE ONES, WHAT WE DID NOT HAVE FOR CMIP5, SO I KEPT THE ORIGINAL ESGF NAMES FOR THE TIME BEING (THE CDS TEAM MIGHT PROPOSE SOMETHING ELSE).
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- Global metadata: these fields can describe many different aspects of the file such as
- when the file was created
- the name of the institution and model used to generate the file
- Information on the horizontal grid and regridding procedure
- links to peer-reviewed papers and technical documentation describing the climate model,
- links to supporting documentation on the climate model used to generate the file,
- software used in post-processing.
- variable dimensions: such as time, latitude, longitude and height
- variable data: the gridded data
- variable metadata: e.g. the variable units, averaging period (if relevant) and additional descriptive data
File naming conventions
THIS WILL CHANGE, SINCE WE WILL NOT ANY MORE OFFER FULL FILES USING THE WPS SERVICES. THE OUTPUT FILE NAMES WILL BE PROPOSED BY THE WPS TEAM OR THE CDS TEAM, TO BE CHECKED WITH THEM!
When you download a CMIP6 file from the CDS it will have a naming convention that is as follows:
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- variable_id: variable is a short variable name, e.g. “tas” for “temperature at the surface”.
- table_id: this refers to the MIP table being used. The MIP tables are used to organise the variables. For example, Amon refers to monthly atmospheric variables and Oday contains daily ocean data.
- source_id: this refers to the model used that produced the data.
- experiment_id: refers to the set of experiments being run for CMIP6. For example, PiControl, historical and 1pctCO2 (1 percent per year increase in CO2).
- variant_label: is a label constructed from 4 indices (ensemble identifiers) r<k>i<l>p<m>f<n>, where k, l, m and n are integers IT WAS REFERRED TO AS W, X, Y, Z ABOVE, I THINK WE SHOULD BE CONSISTENT!
- grid_label: this describes the model grid used. For example, global mean data (gm), data reported on a model's native grid (gn) or regridded data reported on a grid other than the native grid and other than the preferred target grid (gr1).
- time_range: the temporal range is in the form YYYYMM[DDHH]-YYYY[MMDDHH], where Y is year, M is the month, D is day and H is hour. Note that day and hour are optional (indicated by the square brackets) and are only used if needed by the frequency of the data. For example, daily data from the 1st of January 1980 to the 31st of December 2010 would be written 19800101-20101231.
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