Adding new diagnostics to UKCA

Unified Model
1

Hi,
I am currently adding some diagnostics to the asad_flux_dat.F90 code in vn11.1. When trying to add the reactions:
COS + O(3P) - CO + SO2 and COS + photon - CO + SO2, I receive a ‘RXN NOT FOUND’ error in atmos main, however, these reactions are present within the ukca_chem_master.F90 file so I am confused as to why they are not being allowed to be output! Have you seen this error before?

Thanks,
Hannah

2

Hi Hannah,

Could you commit your changes and point me to your branch?

This message will crop up if there are any string differences between how you list the reactions in asad_flux_dat and ukca_chem_master. Possible reasons for these differences could be coming from:

  1. Extra or missing spaces in species definitions. These should be exactly 10 characters including spaces
  2. Changes of case
  3. Accidentally using a zero instead of a letter O
  4. Accidentally using a tab instead of a space
  5. Check that the number of reactants+products has been correctly specified for the definition in asad_flux_dat - if this is incorrect it will either miss a product or perhaps include a blank product
  6. Are these reactions in the mechanism for this chemistry scheme at this version? You can check the pe000 file in the atmos_main/pe_output directory within your suite’s work directory to see a full listing of the mechanism

Best wishes,
Luke

3

Hi Luke,

Thanks! I think the issue is that the reactions are in strattrop but needed the aerosol scheme on so weren’t in the actual mechanism! I hadn’t realised they needed to be present to output them as I could see other diagnostics for reactions which aren’t occurring (CS2 + OH for example).

Best wishes,
Hannah