[Wrf-users] ECMWF and WRF3

[Alan Gadian]

Ravan, Jean-Louis,

I wonder if there are two elements here (I could be wromg)
1. Is the ERA40 data
2. Is the T799 data

Ralph is going on the wrf course at NCAR next week, and Wei
is also looking at the T799 data, so I am hopeful
we can get a solution too.

Jean-Louis, have you managed tpo get the T799 data working?

I have to admit that Ralph and I have put this on the back-burner
as I was away and Ralph had other.  We will keep in touch.

Jean-Louis, did you get the T799 data workimg (that is the current
operational model data)?

Thanks
Alan


> On Monday 23 June 2008 17:48:13 Ravan Ahmadov wrote:
>> Dear all,
>>
>> Is someone able to run successfully WPS/WRF3 with ECMWF model level
>> data? The data which worked in the previous versions of WRF/WPS don't
>> work with the latest ones.
>>
>
> Hi Ravan,
>
> It's a long story, but you can do it. Be patient.
> Here is a summary of my own fights against wrf-3 and ECMWF model levels.
> I hope I did not forget too many things.
>
> Fisrst, there is a risk of segfault in geogrid, depending on the compiler you
> use. It was already present in version 2, so you can skip if you are happy
> with it. Here is my diff in WPS/geogrid/src/source_data_module.F :
> ************************
> @@ -632 +633,2 @@
> -            if (ie - is <= 0) ie = 128
> +            if ((ie - is <= 0) .and. (is <= 128)) then
> +               ie = 128
> @@ -633,0 +636 @@
> +            end if
> @@ -663 +669,2 @@
> -            if (ie - is <= 0) ie = 128
> +            if ((ie - is <= 0) .and. (is <= 128)) then
> +               ie = 128
> @@ -664,0 +672 @@
> +            end if
> **************************
>
> Then, the way they compute PSFC in real.F in WRFV3 is different. To make it
> compatible with ECMWF model levels, you have to force the use of subroutine
> sfcprs2 in module_interp_real.F. This is done by adding this line to
> the "domains" section of namelist.input :
>    sfcp_to_sfcp = .true.
>
> Next, if you download lnsp instead of sp from Mars, it works but you have to
> modify ungrib.F :
> *****************************
> @@ -278 +278,2 @@
> -           if (((field == "SST").or.(field == "SKINTEMP")) .and. &
> +           if (((field == "SST").or.(field == "SKINTEMP").or. &
> +                (field == "LOGSFP")) .and.                    & ! modif jlm
> *****************************
> Finally, I have modified calc_ecmwf_p.F to make it possible to use only a
> subset of the 96  ECMWF model levels. It saves disk space and download time.
> If some people are interested, I will mail them the modified code.
>
> Last : do not use "ucmcall = 1,1,1" in the "physics" section of namelist.input
> if you use two-way nesting with "input_from_file = .true., .true., .true."
> For me, it fills all the fields with NaNs at the first simulation hour.
>
> I hope this helps.
>
> -- 
> Jean-Louis Monge
> Ingénieur-conseil
> 09 50 51 14 43
> jeanlouis.monge at free.fr
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