Choose different values of the variable nyear (or nmonth, ndays) depending on the currently running model year

[nwieters]

How to set up a runscript that allows to choose different values of the variable nyear (or nmonth, ndays) depending on the currently running model year.

For example:

Choose
nyear = 10 if year 2010
and
nyear = 5 if year >= 2010

[JanStreffing]

I think this should be possible with a normal choose block. https://esm-tools.readthedocs.io/en/latest/yaml.html?highlight=choose#switches-choose

[nwieters]

Hi @JanStreffing , thank you for your tipp. I asked this here for another user and put it here, because this might be of interest for others as well.

I will try out your suggestion with a choose block and then write a runscripts-example snippet as an answer.

[nwieters]

Choosing the value for runscript variables like nday, nmonth or nyear is not possible. These variables are immutable and can therefore not be changed from the runscript.
In order to run a simulation from 1.1.2000 to 31.12.2014 with nyear: 5 and not ignoring the final date 31.12.2014, an easy solution would be to split the simulation into two. The first one running from 1.1.2000 to 31.12.2010 with nyear: 5 and the second run from 1.1.2014 to 31.12.2014 with nyear: 4.
This is a solution that most user propably do already.
By keeping nyear: 5 the simulation will ignore the final date (31.12.2014) and run for the full chunk length of nyear: 5 (until 31.12.2015).