One month simulation

Questions and other topics related to UEMS 15.
Post Reply
rob
Posts: 3
Joined: Fri Oct 20, 2017 8:16 am

One month simulation

Post by rob » Fri Oct 20, 2017 9:37 am

Greetings everyone, I'm new to this forum.
I want to run WRF over one month, in the past.
Is it ok to run a single simulation for the whole period, or it should be splitted in chunks of few days with some spin-up period for each chunk?
Thank you
Roberto

meteoadriatic
Posts: 1567
Joined: Wed Aug 19, 2009 10:05 am

Re: One month simulation

Post by meteoadriatic » Fri Oct 20, 2017 4:28 pm

Hello,

Yes it is OK to do it as a single run, but feed it with frequent boundary conditions updates.

rob
Posts: 3
Joined: Fri Oct 20, 2017 8:16 am

Re: One month simulation

Post by rob » Tue Oct 24, 2017 9:45 am

Thank you!

I have set up three nested domains because I want to produce a 50x50 output with 4km gridsize and then use the output to run the diagnostic model CALMET at higher resolution, after processing the WRF output with CALWRF.

I am using the "--dset cfsrpt25" flag that seems to be the suggested one for this analysis, but I see there are several datasets available. Is there another one to be preferrred for Italy? Also, should I use --nudge and --analysis flags?

At the moment I've made a run for one month (Jan 2016), with these commands:

ems_prep --domains 2,3 -dset cfsrpt25 -date 20151230 -length 816 -nudge
ems_run --domains 2,3

And got some hourly CALMET results that compared with the observations at an airport do not have too much to do with :)

Thank you for any comment and best regards

meteoadriatic
Posts: 1567
Joined: Wed Aug 19, 2009 10:05 am

Re: One month simulation

Post by meteoadriatic » Tue Oct 24, 2017 3:38 pm

Hello,
rob wrote:
Tue Oct 24, 2017 9:45 am
...
And got some hourly CALMET results that compared with the observations at an airport do not have too much to do with :)
If this:
rob wrote:
Tue Oct 24, 2017 9:45 am
I have set up three nested domains because I want to produce a 50x50 output
means that your domain size is 50x50 points, this is most likely the cause.

Refer to this:
http://www2.mmm.ucar.edu/wrf/users/name ... c_wps.html
(section named "e_we and e_sn")

But there also can be other reasons for problems. First correct that, try again, if there is no big improvement then let us know.

Post Reply