DYAMOND Winter

Simulation Period:

20 January 2020 - 1 March 2020

with 10 day spin-up peripode and 30 days analysis periode

Field Experiment:

align with the EUREC4a field study.

Experiment:

Global atmosphere-only and coupled atmosphere-ocean models with a storm resolving grid spacing of 5 km or less. Detailed information can be found in the DYAMOND Winter protocol (pdf).

Initital data is provided at the ESiWACE webpage.

Completion of the simulation is still ongoing.

Participating models and description

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.

Grid information

For several models, the grid information is not included in the output. Instead it can be found in a grid.nc file. You can find this grid file in the fx frequency of the directory structure of the data. For example
/work/ka1081/DYAMOND_WINTER/NOAA/SHiELD-3km/DW-ATM/atmos/fx/gn/grid.nc
for the SHiELD data.
cdo will need a -setgrid,GRIDFILENAME, e.g.
cdo -sellonlatbox,0,20,40,60 -setgrid,GRIDFILENAME INFILE OUTFILE
to associate the grid information with the data.

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.

Working with the data

Direct file access

All stadardized data sets can be found in 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://docs.dkrz.de/doc/getting_started/index.html.

For model and run descriptions see Participating models and description above.

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 webfrontend (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.

For model and run descriptions see Participating models and description above.