Opened 14 years ago

Closed 14 years ago

#20 closed help (fixed)

creating a limited area model: guessing number of land points

Reported by: tea@… Owned by: lois
Component: UM Model Keywords:
Cc:… Platform:
UM Version:



I'm following the example in "Selecting a new LAM area" for the UM Users Guide. (note: the users guide says it is for v5.5, I am using 6.1 but can't find a 6.1 users guide anywhere). This is also job xcele on the Reading machines, with output in /hpcx/home/n02/n02/arbetter/um/umui_out/xcele.* on hpcx.

I used lampos to define a region as described and run the global model to produce the lateral boundary conditions and start dump; that all worked fine. But the next bit is to generate orography using the reconfiguration. According to the user guide, the reconfiguration should fail the first time since the number of land points is not correct, and it did. But there should be information in the output file containing the correct number of land points, and I cannot find this. The guide says to search for "SETCONA: Wrong number of land points" or "No of land points" and neither of these phrases are in the leave file.

Seems like I'm missing some information, or have skipped a step. Lampos is just a graphical tool; it doesn't actually generate a landmask or other ancillary files. Is there somethign else I should be doing? Or has the output of the LAM reconfiguration changed from v5.5 to v6.1 (so the manual is out of date)?


Change History (1)

comment:1 Changed 14 years ago by admin

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

Hello Todd,

Firstly there is no UM User Guide for 6.1 so the 5.5 User Guide should suffice for 6.1. Secondly most advice in the UM User Guide works fine at the Met Office but it is not necessarily true outside the Met Office!

Your right that Lampos is only a graphical tool and its purpose is to help you set up the switches for generating the LBCs for your new limited area. Generating the ancillary files for your area is non-trivial as it requires that you use the UK Met Office Central Ancillary Program which is not generally available outside the Met Office. However we have now got it working at BADC and Chang Gui Wang has written an interface to it so that it is a start of a new NCAS service for creating ancillary files. It is still new and experimental so it is not yet linked from the CMS pages. We should do this soon. So if you go to Chang's home page follow the links to ancillary files *NEW* then you could try to use the service to create your ancillary files. If you need help with this then you should contact Chang, she would welcome feedback.

I hope that this begins to answer your questions.


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