Aerosol cycling (nested)

These are the ones where the met is cycled (36 hour cycling in the example below), but the aerosol is taken from the previous run (in nested and global; can you choose?) :-

Here are the steps needed :-

• Create the spun-up aerosol field - see here :-

  • Running the UKCA

Running with cycling

• If doing the cycling for the nest then you also need to create a MODE_INIT file for the nest.

  • This can be done using a copy of the spin-up suite. NOTE - may need to watch out for the Number of land points nlandpts recon error, see : UM_common_issues

  • , or the science run suite, but with the cycling for the nest switched off. This will then not require the nested MODE_INIT file and so can be run. Then just run the RCF for this run to create a start file for the nest, which can then be used as the MODE_INIT file for the science run.

Running without cycling

• Can switch off cycling completely by setting the start and end cycling dates to be the same.

  • The danger here is that the met in the global run may drift from reality since there seem to be problems with nudging in v10.8.

  • Global cycling will at least keep the global consistent and will influence the nest through the boundaries (more influence for small nests).

• Can just switch off nested cycling by setting FREE_RUN = true. - needs testing to make sure.

  • Think the latter would then mean that don't need a MODE_INIT file for the nest?