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There is a very useful User Guide prepared by the EURO-CORDEX community which is providing guidance how to use EURO-CORDEX climate projection data. Please note that the data download part of this document at this stage refers only to access the data from the ESGF directly. This EURO-CORDEX User Guide is available at https://www.euro-cordex.net/imperia/md/content/csc/cordex/guidance_for_euro-cordex_climate_projections_data_use__2021-02_1_.pdf. Certainly the data can be also downloaded from the CDS and this information will soon also be provided in that document.
The spatial overlaps of the different CORDEX domains provides an opportunity for building grand ensembles by pulling together all the existing simulations from the different domains. Although this could in principle create some heterogeneity and/or duplication, there are recent studies that use and support this option (https://doi.org/10.1175/JCLI-D-19-0084.1), although though further research is still needed to assess the resulting grand ensembles (see for instance https://doi.org/10.1029/2019GL086799). A user guide has been produced to provide some guidelines how to use worldwide CORDEX data in overlapping regions: Description and user guide of the worldwide CORDEX C3S dataset assessing potential conflicts due to overlaps.
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There is a C3S regional climate projections User Forum that contains a number of FAQs related to CORDEX data. These questions and answers cover a wide range of topics and may be of interest to both any CORDEX data users and general climate projection data users.
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