Opened 2 weeks ago

Last modified 7 days ago

#2481 new help

Vegetation fraction ancillary file

Reported by: charlie Owned by: um_support
Priority: normal Component: UM Model
Keywords: Cc:
Platform: NEXCS UM Version: 10.7



Was hoping one of you could help with a question regarding the vegetation fraction ancillary file used by the UM (specifically GC3.1 N96 ORCA1 UM10.7 NEMO3.6)? The question is in 2 parts.

As you know, the vegetation fraction ancillary file (qrparm.veg.frac) contains 9 different tiles, but all of these have only one timeslice (presumably an annual mean).

Firstly, therefore, do you know if a monthly climatology version of this exists, i.e. the same file but 12 timeslices? If so, could you point me to its location on either Archer or Monsoon?

Secondly, if such a thing does exist, can you advise what would need to be changed within the model, in order to read this in at the monthly timescale rather than just one value? I believe there used to be a simple switch within the old-fashioned UMUI, but how would one go about doing this using the new Rose/Cylc? architecture?

I have also asked this question to the land surface group here, as I realise it bridges the gap between a science question (which you probably can't help with) and a technical question (which you can).

Many thanks,


Change History (2)

comment:1 Changed 10 days ago by charlie


Just to say I think I have solved this question myself. Within Rose, I went to um > namelist > Reconfiguration and ancillary control > Configure ancils, then selected the relevant ancillary file, then set update_anc to .true. and the period to Months. I haven't actually tried running with this yet (I'm about to do that now), but this appears to be the right place at least, unless I am missing something?


PS. I don't close this ticket just yet, until I have successfully tested running the model with updating switched on and using an appropriate ancillary file?

comment:2 Changed 7 days ago by charlie

Hi again,

Sorry to come back to this, but it doesn't seem to be as simple as I first thought. The above comment is correct for certain suites, such as the one I looked at to get the above answer (u-aw739).

However, I am now wanting to actually try this, using an appropriate 12 monthly climatology vegetation fraction ancillary file that I have created, but my suite doesn't appear to have the vegetation fraction listed. My suite is u-ay584, but if I go to um > namelist > Reconfiguration and ancillary control > Configure ancils then the vegetation fraction isn't listed. In fact many of them are not listed. Therefore I can't go into it to change the updating.

Please would you advise where this listed is in the suite, if not here?


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