Opened 13 years ago

Closed 13 years ago

#54 closed help (fixed)

Reconfiguring a global dump to A LAM dump - follow up (ticket 52)

Reported by: g.n.petersen@… Owned by: um_support
Component: UM Model Keywords:
Cc: Platform:
UM Version:


Hi Chang,

sorry for sending this straight to you but I just want to clarify a few
points because I'm not sure if I understand you entirely and I really
want to get going, doing some proper runs :-)

  • You're suggesting that I reconfigure my global dump using ancillary

files for mask, orog, ice, soil and veg properties?
As I don't want to change these at all, can I use the values from a
start dump (reconfigured from the global dump) and make ancillaries for
I am of course already using a orography ancillary file.

  • Do I also have to worry about the sst ancillary file? That is actually

the only one I have done tests with.

  • Do you suggest that any time one of these is changed ancillary files

for the others should be used in reconfiguration?

Thanks for pointing out that the standard ancillary files have -1.0737e09
as ice fraction over land. I hadn't picked up on that one.

Please let me know if you think of anything else I should consider.

All the best,


Change History (2)

comment:1 Changed 13 years ago by cwang

Hi Nina,

Yes, you need to use those ancillary files. The values interpolated from global are not consistent and that is why ancillary files are needed. So you can't take those values from the global.

If you want to use soil/veg from the global dump, then you should have a reason to do so and you need to make them consistent before you use them which means you need to do some modifications youself. The best way is to modify them using the Ancillary File Program to do so. You should know that that veg and soil properties should not have big difference between dump and ancillary files and soil/veg generated for LAM should have better resoltuion than those from the global dump.

The sst should be from the dump if it is available.

I hope it make sense.

Best wishes.


comment:2 Changed 13 years ago by cwang

  • Resolution set to fixed
  • Status changed from new to closed
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