Snow ancil problem
|Reported by:||rm024650||Owned by:||um_support|
Dear CMS helpdesk
I am trying to setup a N96 GA6 run (job id XMKXK) with surface snow amount updated periodically from a modified snow ancillary file. The run setup is mostly a copy of the N96 GA6 template job.
I have never used a snow ancillary before. To make sure the UM is really reading and updating the surface snow amount from the file, I made a modified version of the standard qrclim.smow file and replaced the snow amount over Asia throughout the year with values similar to that over Antarctica. The modified snow ancil file is located at /work/n02/n02/rm024650/snow_ancil/smowv1_mod2.
The NRun finished without error. However, when I look at the STASH output (/work/n02/n02/rm024650/xmkxk/xmkxka.pf19810901) and the restart dumps, it seems that the UM is not reading or updating the surface snow amount from the modified ancil. A quick look at the snow amount over land in the reconfigured dump (xmkxk.astart) with Xconv shows a blank plot with all grids containing the missing value (-1073741824.000000) instead of what is in the modified snow ancillary.
I am aware of a very old ticket from Andy Turner (#138) and the solution seems to be a user prestashmaster file. I copied the file from Jeff’s directory on PUMA, modified it to fit the current format (/home/rm024650/snowdepth_update on PUMA) and included it in the UMUI, but it is still giving me missing values for snow amount over land in the reconfigured dump.
I am wondering if I am doing anything wrong (especially with the prestashmaster file) such that something went wrong when creating the reconfigured dump? Any advice would be great. Thank you.