Skip to content

Running the UKCA

Jump to bottom
dangrosvenor edited this page Mar 28, 2023 · 9 revisions

First step (as with other UKCA runs) is to generate a 'spun up' aerosol field to initialize the aerosol part of the UKCA start field (since UM met files do not contain aerosol). There are two stages to doing this :-

  1. Transplant aerosol data from another UKCA file of some kind (does not have to be the same date) into a met dump for a date around a month before the start of your science runs.
  • i. Can use a copy of job u-at818 for this - we just need to run the RCF (reconfiguration) stage.
  • ii. Just change the dates and the name of your met file (dm_ic_file under "Driving model setup").
  • iii. This is an N512 run and so will produce N512 file.
  • iv. The file will appear as (for example) :-
~/cylc-run/u-at818/share/cycle/20140801T0000Z/glm/ics/glm_astart
  1. Run a nudged global UKCA run using this for around a month to spin up the aerosol (make it consistent with the met) - needs to produce a dump (da file) for the start date of your science runs - set the end time correctly for this! Since this is nudged the meteorology should be consistent with reality.

  • i. Can use a copy of job u-bi012 for this - however, this is N96 global model resolution and v10.3. Hopefully this will not matter since the RCF stage of the science run should convert to the required resolution. Hopefully using v10.3 files will be compatible with v10.8…?

  • ii. Set the dm_ic_file to be a copy of the file that you generated from the step above (~/cylc-run/u-at818/share/cycle/20140801T0000Z/glm/ics/glm_astart).

  • iii. Set the start date to coincide with the date of the above file (one month before the start of the science run).

  • iv. Set to run until the start of the science run, so that it produces a dump at that point.

  • v. Just need to run the global model here.

  • vi. Then will use the last da file from the run for the start dump for the science run.

Clone this wiki locally