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Ticket Resolution Summary Owner Reporter
#50 fixed Geostrophic winds STASH? um_support caroline@…

Hello NCAS,

Is there a quick way of getting geostrophic winds out of the UM?

Thanks, Caroline

#51 fixed XCONV: Converting file to Grads jeff caroline@…


I am with converting a single parameter in start file xaexc.astart, into grads with xconv both at Leeds and at hpcx. The data is there when I 'view data' on the original file, but when I convert it to grads or netcdf, the new file is full of 0's or 2.0000e+20

Also when I plot any of the parameters in the original .astart file, the program breaks and causes a segmentation fault.

When I sftp'd the .astart to Leeds to try to do the conversion here, it appears to have wiped all the information from the file (when I view the data there is nothing), so I can't do the conversion here.

Any advice on what to do/try? The file in question is at /hpcx/devt/n02/n02-ncas/cbain/xaexc/xaexc.astart

Thanks, Caroline

#52 fixed UM and ancillary files cwang umdoc

Dear all,

I need some help regarding UM and ancillary files. I have made a sea ice ancillary file using xancil0.40, taking into account the rotated pole. As an input I gave xancil sea ice concentration and sea ice depth but xancil calculated the se ice edge (basically giving every grid point the value -1.0737e+09 ).

I've then attempted to use the ancillary file in a LAM run, using data from a global run as boundaries and as ancillary files, with the exception of the land mask and the orography that were retrieved from BADC. My job is xckgb and can be found in /hpcx/devt/n02/n02-ncas/gnp/xckgb/ on the hpcx.

Now, when I run the UM the job fails in the first time step:

Atm_Step: Timestep 1 RHS zero so GCR( 2 ) not needed ==============================================

and then stops when Gathering fields, as most likely no fields to gather.

Do you have any idea what I'm not doing that I should be doing? Or how I could find out what's going wrong?

My own thoughts were that perhaps there were some incompatibilities between my new sea ice ancillary file and the rest of the variables in the restart file. The land mask is consistent with the sea ice and there is no sea ice over land. Is the sea ice edge a problem? I'm putting all my sea ice data into the sea ice concentration. Is there any documentation on sea ice ancillary files? Are there any other variables I should be worrying about?

Any help here would be greatly appreciated.




Guðrún Nína Petersen School of Environmental Sciences University of East Anglia Norwich UK

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