[Wrf-users] Uses of external soil temperature and moisture in WRF

Josh Hacker hacker at ucar.edu
Tue May 19 10:40:58 MDT 2009


Noah is prognostic in soil temperature (and moisture).  It also provides
the lower boundary conditions (fluxes) for the atmospheric model by
solving the energy balance equation.  Only the deep soil temperature is
typically held time invariant.  Unless you are trying to route water
then it does not require lateral boundary conditions because the
derivatives are only in the vertical direction.


Kemp, Eric M (IS) wrote:
> Dear WRF Community:
> When WRF is run with a land surface model (e.g., NOAH), it requires soil
> temperature and moisture values from the WPS.  Question:  does the
> WRF *only* use these values for its initial condition, or does it also use
> these values throughout the simulation?  If the latter, how are these values
> used?  (Are they boundary conditions along the north, south, east,
> and west sides of the grid?  Are they boundary conditions for the
> bottom layer?  Are they used directly at the surface?)
> Thanks,
> -Eric
> Eric M. Kemp
> Meteorologist
> Northrop Grumman Information Systems
> Advisory Services Division (TASC)
> 4801 Stonecroft Boulevard
> Chantilly, VA 20151
> 301-286-9768              (NASA Goddard Office)
> 703-633-8300 x7078 (Chantilly SLEET Lab)
> 703-633-8300 x8278 (Chantilly Office)
> 703-449-3400              (Chantilly Fax)
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Joshua Hacker
Research Applications Laboratory
email: hacker at ucar.edu
voice: 303-497-8188
fax: 303-497-8386

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