[Wrf-users] WRF-CCSM

Kevin Matthew Nuss wrf at nusculus.com
Wed May 18 20:45:05 MDT 2011

Hi Jatin,

I noticed that nobody gave you an answer, so I thought I would give it a

Within WRF, Noah LSM does not need continuous soil temperature and moisture
data. real.exe creates data in the wrfinput_d0? file for initial conditions,
but from there the LSMs models soil temperature and moisture themselves
based on what the atmosphere does, and which in turn affects the atmosphere,
of course. Even if you use the sst update option, there is no soil moisture
or temperature data in the wrflowinp_d0? files. The WPS process uses a lot
of variables, but some only make it into the initial conditions, not ongoing

Regarding the intermediate format - the users guide gives a description of
the format, and it also mentions that the source code
metgrid/src/write_met_module.F90 can be used as a starting point. You
probably knew that already. The netCDF folks at unidata(?) (Google netCDF)
have library interfaces for several programming languages so you might find
one that fits your programming experience. I have not written intermediate
format myself, so I can't help with any source code. Sorry.

Best Wishes,

On Wed, May 4, 2011 at 3:12 AM, Jatin Kala <J.Kala at murdoch.edu.au> wrote:

>  Hi there,
> I am trying to run WRF with CCSM data, and is starting to write some code
> to do the conversion from netcdf to “intermediate” format. Turns out it’s a
> fairly massive job to do from scratch, and I am just wondering if somebody
> has already done some of that and is willing to share their code ?
> One thing I am yet to figure out is that the Noah LSM needs 6 hourly soil
> data (I am pretty sure), but 6 hourly soil data is seldom available from any
> GCM! The best I have found is some monthly means…. Does this mean I have to
> somehow interpolate monthly means to 6 hourly ? any suggestions?
> Cheers,
> Jatin
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> Wrf-users at ucar.edu
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