[Wrf-users] Saving precip variables in auxiliary history file

[Eric Altshuler]

I want to thank everyone who replied to my question. I was able to get the precip variables saved to auxhist2. Also I discovered a couple of things that may be important for some users:

1. There are already several variables being saved to auxhist1 so I guess it's being used for some special application. So I decided to use auxhist2 instead so that only the variables I want are saved.

2. Having 'rh2du' in the registry file will not give the same results as having 'rh02du'. The former will save the variable to auxhist2 but will NOT save it to the default history file, even though it would be saved there with 'rhdu'. The '0' is necessary to save the variable in both the default and the auxiliary history files.

Best regards,

Eric L. Altshuler
Assistant Research Scientist
Center for Ocean-Land-Atmosphere Studies
4041 Powder Mill Road, Suite 302
Calverton, MD 20705-3106
USA

E-mail: ela at cola.iges.org
Phone: (301) 902-1257
Fax: (301) 595-9793

----- Original Message -----
From: "wrfhelp" <wrfhelp at ucar.edu>
To: "Eric Altshuler" <ela at cola.iges.org>
Sent: Wednesday, March 25, 2009 12:37:01 PM GMT -05:00 US/Canada Eastern
Subject: Re: Saving precip variables in auxiliary history file

Below is an example of adding RAINC to aux1 file. Note the
	rh01du
in the line below. This tells the code to write this output to  
standard (0) and auxhist1 file

Note this change is made to Registry.EM, and you need to clean and  
compile the code again after any changes to this file.

state    real  RAINC            ij      misc        1         -       
rh01du   "RAINC"                 "ACCUMULATED TOTAL
  CUMULUS PRECIPITATION"                 "mm"


Some parameters you can consider adding to the namelist (time_control  
section) are:
  auxhist1_interval                   = 60,			---> write data every hour
  io_form_auxhist1                    = 2,			---> mst be a netcdf  
output file
  frames_per_auxhist1                 = 24,		---> write 24 times to a  
file (so one file per day)


Hope this helps
wrfhelp

On Mar 24, 2009, at 10:22 PM, Eric Altshuler wrote:

> Hello,
>
> When running WRF-ARW, I want to save the default history file every  
> 6 hours but I want to save two accumulated precipitation variables  
> (RAINC and RAINNC) every 3 hours. From the documentation, I have the  
> impression that to do this I need to modify the Registry and save  
> the precip variables in an "auxiliary" history file which is  
> labelled with a number from 1 to 11 (i.e. auxhist1, auxhist2, ...,  
> auxhist11). However, I'm not sure what specific changes to make in  
> the Registry file and the namelist.input file to enable saving  
> auxiliary history data. Can I use any number from 1 to 11 or are  
> some of the numbers reserved for special purposes (as is the case  
> with some of the auxinput files)? If anyone has successfully done  
> what I am trying to do, I would appreciate your advice.
>
> Thanks in advance for your assistance.
>
> Best regards,
>
> Eric L. Altshuler
> Assistant Research Scientist
> Center for Ocean-Land-Atmosphere Studies
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705-3106
> USA
>
> E-mail: ela at cola.iges.org
> Phone: (301) 902-1257
> Fax: (301) 595-9793