The DYAMOND Winter Model intercomparison

Experiment

The DYAMOND Winter intercomparison consists of global atmosphere-only and coupled atmosphere-ocean models with a storm resolving grid spacing of 5 km or less and covers the period of 20 January 2020 to 1 March 2020. The period was chosen to align with the EUREC4a field study. Detailed information can be found in the DYAMOND protocol (pdf).

If you are interested in contributing, you can find the necessary information, as well as initial and boundary conditions at the official webpage. Please contact us via dyamond@esiwace.eu before setting up your model.

Working with the data

We are in the process of standardizing the contributions we received so far. THIS MEANS THAT FILE NAMES CAN CHANGE AT ANY TIME WITHOUT PRIOR WARNING. Please have a look at the overview of the processed variables for variable names and data availability.

Please note that because of disk space constraints we will start offloading data to our tape archive soon. We provide scripts for requesting data to be downloaded into the library as needed. Please find more information regarding this at The DYAMOND Data Library.

Participating models and description

For an overview of the models, please refer to the DYAMOND Summer documentation for now:

Direct file access

All stadardized data sets can be found in the The DYAMOND Data Library at /work/bk1040/DYAMOND/data/winter_data/ stored at the DKRZ’s Mistral supercomputer. The data sets are read-only, so you will have to define the respective subfolder as the source directory for your post-processing scripts in your home folder. Since the quota of your home directory is limited to 24 GiB, we recommend to store project data under /work/bb1153/<user-account>/ and use the temporary storage in your scratch folder /scratch/*/<user-account>/ for processing of large data sets.

To access the DYAMOND data library you will need a user account for the project “1153”, named “DYAMOND Data Intercomparison” at DKRZ. To join the project, please visit https://luv.dkrz.de. For more information about how to start at DKRZ see: https://www.dkrz.de/up/systems/mistral/hpc-concepts.

Using Freva and gems.dkrz.de to browse the data

For an overview of the processed files, please have a look at The GEMS Freva (use your mistral ID or the “guest” button to log in). To browse the files in the shell, you can use the freva command line interface (note that this currently is in alpha stage as we are moving things in the background):

export MODULEPATH=$MODULEPATH:/work/ka1081/gems.modules/
module load gems/alpha

# to get an overview of the data available
freva --databrowser project=dyamond --all-facets

# use tab-completion
freva --databrowser project=dyamond experiment= TAB TAB

# all surface air temperature files for ifs-4km with 1hr time step
# (see possible options from --all-facets above)
freva --databrowser project=dyamond experiment=dw-cpl  model=ifs-4km variable=tas time_frequency=1hr

# call cdo on multiple files
cdo -sinfov  $(freva --databrowser project=dyamond experiment=dw-atm  model=arpege-nh-2km variable=rst)

Using intake-esm and jupyterhub

See the example at Working with Intake-ESM and The DKRZ Jupyterhub documentation.