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CMIP6 data is reported either on the model’s native grid or re-gridded to one or more target grids with data variables generally provided near the center of each grid cell (rather than at the boundaries). For CMIP6 there is a requirement to record both the native grid of the model and the grid of its output (archived in the CMIP6 repository) as a “nominal_resolution”. The "nominal_resolution” enables users to identify which models are relatively high resolution and have data that might be challenging to download and store locally. HOW THE USERS WILL KNOW WHAT GRID IS USED FOR THE GIVEN MODEL?
Pressure levels
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 ALL WILL BE SINGLE LEVEL FIELDS?
Frequency | Number of Levels | Pressure Levels (hPa) |
Daily | 8 | 1000., 850., 700., 500., 250., 100., 50., 10. |
Monthly | 19 | 1000., 925., 850., 700., 600., 500., 400., 300., 250., 200., 150., 100., 70., 50., 30., 20., 10., 5., 1. |
Ensembles
IN THE FIRST BATCH WE WILL HAVE ONLY THE CONTROL MEMBER. I HOPE (WE ARE DISCUSSING THIS ISSUE WITH RUTH AND MARTIN) WE WILL HAVE ALSO ENSEMBLE MEMBERS. THEREFORE I GUESS THE TEXT BELOW WILL NEOT BE NEEDED AT THE FIRST PUBLICATION.
Each modelling centre typically run the same experiment using the same model 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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Data Format
The CDS subset of CMIP6 data are provided as NetCDF files. NetCDF (Network Common Data Form) is a file format that is freely available and commonly used in the climate modelling community. See more details: What are NetCDF files and how can I read them
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