Unable to output mean and instantaneous fields concurrently

[edblockley]

Using the new iomput code it is not possible to output mean and instantaneous fields from the same run.
We require this functionality for our operational models and so, at present, are not able to use iomput.

Can this be changed to allow the simultaneous output of mean and instantaneous fields.

[smasson]

This can be done if you use iom_put but there is a small trick to make it work:
In addition to redefine operation to inst(X), you need yo redefine the attribute freq_op for the variable you want to output as instantaneous. In this specific case, freq_op must be equal to the output file frequency and no more to the model frequency. There is a small example for a 1d file with mean and instantaneous SST:

<file id="1d_grid_T" name="auto" description="ocean T grid variables" >
  <field ref="sst"   name="sst_mean"    />
  <field ref="sst"   name="sst_inst" freq_op="86400" operation="inst(X)"  />
</file>

Note: I don't know if this syntaxe will be keep in the new version of iom_put that will be incorporated in the next release (Jan 2013)...

[j.abalichin]

Dear all,
I tried out the suggested solution for the instantaneous and average output for our NEMO3.3 version.
This seems not to produce the expected averages over the selected time period, just a time average over the used timestep.
Does someone have a different solution/workaround to create such an output?
Many thanks in advance,
Janna