Nest at different start times deliver wrong results

Discuss the nesting capability within the model itself and any problems you might have run into.

Nest at different start times deliver wrong results

Postby hwalther » Thu Sep 08, 2011 1:51 am

Running 3 nests with equal start times is correct.
Starting the 3. nest 6 hours later results in zero at least for T2 and SW radiation for times 0-5 and 7-12 of the hourly results.
It looks like a shift of 6 hours.
Anybody expierienced with delayed start of a subnest?
hwalther
 
Posts: 4
Joined: Sun Feb 01, 2009 1:57 pm

Re: Nest at different start times deliver wrong results

Postby adprest » Fri Jun 12, 2015 8:36 pm

I would like to delay my 2 fine nests (9, 3 km grid spacing) by 12 hours. I have changed the times of the inner nests in the namelist.wps file so that the following met grid files were created:

met_em.d01.1991-09-20_00:00:00.nc (multiple files up to ending time)
met_em.d02.1991-09-20_12:00:00.nc (only this file)
met_em.d03.1991-09-20_12:00:00.nc (only this file


I then made changes to my namelist.input as follows and ran real.exe:
start_year = 1991, 1991, 1991
start_month = 09, 09, 09
start_day = 20, 20, 20
start_hour = 00, 12, 12

This created the following input files:
wrfinput_d01 (Times = "1991-09-20_00:00:00")
wrfinput_d02 (Times = "1991-09-20_12:00:00")
wfinput_d03 (Times = "1991-09-20_12:00:00")

I was able to successfully run wrf.exe after this but my question is whether or not the output is doing what I want. I read that the fine_input_stream is useful for a nest starting at a later time than the coarse domain. Does this mean that I just need to set the following in my namelist.input?
fine_input_stream = 0, 2, 2

Is there anything more I need to change to successfully have a 2-way interactive nesting that is delayed 12 hours from the coarse domain?

Thanks,
Ari
adprest
 
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Location: Florida State University


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