Objective

This is the repository for JGCRI's CMIP6 archive that is stored under /pic/projects/GCAM/CMIP6 on pic. The purpose of this repository is to document and organize the CMIP6 netcdfs used at the Institute and to minimize duplicative efforts to download the data.

All JGCRI pic users are welcome to process CMIP6 netcdfs stored on the pic archive however we ask that you do not modify the netcdf files or save any of your work here because these netcdf files are shared Institute resources.

Available Data

To figure out what data and where data is stored on pic take a look at cmip6_archive_index.csv it contains a CMIP6 information in a table that is easy to subset and filter.

There are several different ways to access the cmip6_archive_index

• Download the cmip6_archive_index.csv and open with excel or import into R/python/ect.
• Anywhere you used R (local or on pic) run archive <- readr::read_csv(url("https://raw.githubusercontent.com/JGCRI/CMIP6/master/cmip6_archive_index.csv")) to import directly from github into R

cmip6_archive_index column description

• file: as string of the full CMIP6 netcdf file name
• type: a string set euqal to data or fx to indicate if the netcdf file is CMIP model output data or CMIP model meta data information.
• variable: a string indicating the CMIP6 variable name, (download the CMIP6 excel work book containing information about the MIP variable names)
• domain: a string indicating the CMIP6 modeling domain (TODO break out information about the frequency of the data from domain name)
• model: a string indicating the CMIP6 model group.
• experiment: as string indicating the CMIP6 experiment name.
• ensemble: a string of the ensemble variant.
• grid: a string of the grid information CMIP6 grid descriptions gn is the native model grid, gr means the model grid has been regirdded, and gm refers to a global mean.
• time: a string describing the start and end date of the output netcdf, some modeling groups break output files for a single experiment into mulitple netcdf files by time.

Requesting Data

If you are intrested in data that is not included in the index then it is also not downlaoded on pic. Please open a GitHub issue describing your data needs (model / experiment / variable and so on) and an ideal timeline. That way we can coordinate the data download and keep track of changes the the archive.

See Wiki for additional information