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<h1>Data and Analyse</h1>
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[[PageOutline(1-2,Table of contents)]]



# Data #

## CMIP archive ##

### Start with CMIP archives ###

We highly recommend to read the user's guide of CMIP projects available at: [https://pcmdi.llnl.gov/mips/]

### Access CMIP archives ###

CMIP archives are available through the ESPRI platform including CICLAD and !ClimServ machines.
You can create an account on ESPRI mesocentre to transparently log to CICLAD or !ClimServ at [https://meso-account.ipsl.fr/].

### Dive into CMIP archives at IPSL ###

The IPSL-CM model produces CMIP-compliant files. The CMIP convention include the CF convention with additional rules from the WIP panel (ex. a CMIP file must describe only one variable).
Once the IPSL-CM data are quality checked, the CMIP-compliant files are migrated to a dedicated filesystem at TGCC following the CMIP directory structure.
This part of the TGCC filesystem is read-only mounted on the ESPRI mesocentre.
On CICLAD and !ClimServ, the CMIP data archives are then available under :

`/bdd/CMIP6`

`/bdd/CMIP5`

The CMIP data from the other GCMs are downloaded at the IDRIS and IPSL. They are organized in the same CMIP directory structure and transparently available in the same `/bdd` root. 

Example:
`/bdd/CMIP5/output/IPSL` provides access to the '''whole''' IPSL-CM data production for CMIP5 exercice.
`/bdd/CMIP5/output/BCC` provides access to BCC data requested by the IPSL community. 

We adopted an "on-demand" process to add CMIP data from other GCM. Please send your request at `glipsl@ipsl.fr` with the following template:
{{{
cat < EOF > my_template.txt
project=CMIP5
experiments=historical amip
models=IPSL-CM5A-LR CNRM-CM5
ensembles=all
variables[atmos][3hr]=cltc tas
variables[land][fx]=sftgif
variables[seaIce][mon]=sic evap
EOF
}}}

### What's a dataset? ###

A "dataset" (as defined by ESGF) is '''one''' version of a data set resulting from a single simulation (i.e., characterized by a unique option of each CMIP facet before the version such as the institute, the model, the domain, the experiment, the frequency, the ensemble, etc.).

Examples:
CMIP5 dataset: `CMIP5/output1/IPSL/IPSL-CM5A-LR/ 1pctCO2/mon/atmos/Amon/r1i1p1/v20110427`

A dataset is the finest granularity for ESGF publication.

## THREDDS access (aka DODS service) ##

The IPSL ESGF node includes a THREDDS data serveur which replaces the deprecated DODS serveur. This service automatically provides free access to parts of filesystems or remotly-mounted filesystems.
From TGCC, the shared space `/ccc/work/cont003/thredds/$LOGIN` is expose at [https://vesg.ipsl.upmc.fr/thredds/catalog/work/catalog.html].

Be careful that the THREDDS spaces at TGCC should only includes hard-links of data from your project spaces on WORK. The THREDDS folders were not designed to host deep copies of your files because of high constraints on storage and inodes.

# Analyse #