Restart.nc file name as a parameter

[shajar007]

Hi, I would like to request - suggest an enhancement:
I'm using GOTM within QWET.
Currently, each run produces a "restart.nc" file. If you set in gotm.yaml, restart=true, than values in restart is used as initial conditions. However, the restart.nc file name is hardcoded and not a parameter. This means that every time you run the model with restart=true you get an initial conditions from the last run. I would like to suggest that the file name will be a parameter so you can set constant initial conditions. So I'm thinking of the restart.nc as a more accurate initial conditions (rather than the intended use - for restart). I find it important to set more detailed initial conditions for processes that take a years to stabilize, such as the humus sediment.
If the solution will include the ability of ParSAC to use it - this would be even better (currently parsac does not copy .nc files).

Shajar

[bolding]

Hi Shajar

Not 100% sure I know what you mean by "GOTM within QWET" :-)

Also not quite sure what the problem you want to address really is. Why is it you can't use constant initial conditions?

Finally, if you run with the GOTM v5 with lake support I don't think anymore work will be done on that version.

The parsac issue not copying .nc files will be the case both with hard-coded and flexible naming.

Best regard,
Karsten

[shajar007]

Hi Karsten,
I am using QWET which is a GOTM-FABM-PCLake integration. I'm not sure what version of GOTM is used, but it has lake support.
For physical initial condition, constant values are fine. But for geochemical variables it's not: sediment humus and inorganic material take about 60 years (in my model) to reach a steady state for their distribution in depth. This affects phosphorus absorption.
I know that parsac is another issue - just a hint for further enhancement if my suggestion will be accepted....
Thanks, Shajar

[bolding]

but you can read in depth resolved initial conditions for all state variables - you don't have to start with constant profiles

[shajar007]

You mean I can load files with initial conditions? I don't see an option in the fabm.yaml or gotm.yaml to do so.

[bolding]

In the namelist age of GOTM it was done in fabm_input.nml - like:
&observations
variable = 'selma_po_glenamong',
file = 'glen_po.dat',
index = 1,
!constant_value = 1,
relax_tau = 1e+15,
/

in the YAML age it is described here - https://github.com/fabm-model/fabm/wiki/GOTM - search for Prescribing biogeochemical variables

[shajar007]

Great! This solves my need. thanks!