...
Begin by logging onto the Cray login nodes:
| Code Block | ||
|---|---|---|
| ||
ssh trcrayXX@ccb <<< use your Cray user id Password: xxxxxxxx trcray@ccb-login2:~> |
The contents of the account should look like:
| Code Block | ||
|---|---|---|
| ||
trcray1@ccb-login2:~> ls bin modules.sh oifs38r1 scratch |
...
| Info | |||||
|---|---|---|---|---|---|
Each time you login and before doing any work in this account, make sure you have the correct environment loaded to run and work with OpenIFS.
|
This will load the appropriate modules for OpenIFS and set the choice of compiler and build environment. It is good practise to use something similar for your own OpenIFS installation.
Creating the OpenIFS ensemble experiment
An ensemble experiment consists of a 'control' and multiple 'perturbed' forecasts, or 'ensemble members'. Typically at ECMWF 25-50 ensemble members will be used to create a spread of forecastsFor the operational ECMWF ensemble forecast, 50 members are used.
For this exercise, to save computer time, each participant will run a single, different 'ensemble member' and we will create the complete forecast ensemble from the individual ensembles run by the class as a whole. A later exercise will show how to do this from the model output GRIB files.
The first exercise is exercises show how to create the experiment directo
Using : createENS .....
Control forecast : cf000
perturbed forecast : pf001
You will run the perturbed forecast (you can run the control later)
Creating the OpenIFS batch job
Using : oifs_run .....
...
directories, prepare the jobs and submit them to the ECMWF Cray.
createENS command
Use the command createENS to create the ensemble experiment:
| Code Block |
|---|
createENS --help
usage: createENS [-h] -d <startdate/enddate/hr_inc> [-m <members>]
Set up ensemble forecast for the OpenIFS 2015 workshop
optional arguments:
-h, --help show this help message and exit
-d <startdate/enddate/hr_inc>, --date <startdate/enddate/hr_inc>
List of date(s) to retrieve, format: YYYYMMDDHH. The
only dates available are: 2013102400/2013102700/24
-m <members>, --members <members>
Number of ensemble members to create e.g. 3 (default 1) |
| Info | ||
|---|---|---|
| ||
Decide which of the available dates to use. Use the createENS command to create an ensemble with just a single member. |
| Info | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ||||||||||||||||
Change to the experiment directory labelled by the date chosen:
There are two experiment directories: cf000 and pf001. cf000 is for the control forecast which is not used here. pf001 is the single perturbation forecast.
Understand what the different files in the experiment directory are for. ICM* : these are the initial starting files. ICMGG* are the initial gridpoint files, ICMSH* are the initial spectral fields. Use the 'grib_ls' command to examine the initial files:
|
Creating the OpenIFS batch job
The namelist file: namelistfc
cp namelistfc fort.4
Edit namelist for your perturbation number.
...
Checking job status: qstatu
Problems (deliberate)
Set length of run to d10 - model will stop and print error that the climate file is too short.