[cam-users] level info for H2OSOI?

[David Noone]

Hi Gary,

The levels are hard coded in the routine, /lsm/lsmtci.F

These are expressed as layer thicknesses.  From the lsm distributed with
CCM3.6.6 (although 3.10.11 is identical), these are as follow:

* soil/lake layer thickness, depths, and relative root fraction

      do k = 1, kpt
         if (ist(k) .eq. istdlak) then                !deep lake
            dzsoi(1,k) = 1.
            dzsoi(2,k) = 2.
            dzsoi(3,k) = 4.
            dzsoi(4,k) = 8.
            dzsoi(5,k) = 15.
            dzsoi(6,k) = 20.
         else if (ist(k) .eq. istslak) then           !shallow lake
            dzsoi(1,k) = 0.5
            dzsoi(2,k) = 1.0
            dzsoi(3,k) = 1.5
            dzsoi(4,k) = 2.0
            dzsoi(5,k) = 2.5
            dzsoi(6,k) = 2.5
         else                       !soil, ice, wetland
            dzsoi(1,k) = 0.1
            dzsoi(2,k) = 0.2
            dzsoi(3,k) = 0.4
            dzsoi(4,k) = 0.8
            dzsoi(5,k) = 1.6
            dzsoi(6,k) = 3.2
         end if
      end do

The "else" part is the soil level thicknesses, and what you are after.
Just add them up to get the depth of the layer interfaces. There is a
bit more about this in Gordon Bonan's Tech report (NCAR/TN-417+STR,
1996) that describes LSM, which you can download from the ncar models
web site (possibly under the link to CSM 1.4).


Cheers,

David




On Thu, 3 Oct 2002, Gary Bates wrote:

>
> hi all,
>
> I've begun to look at soil water (H2OSOI) in my CCM3 simulations.
> H2OSOI is available on 6 levels in the lsm history files (lsmh_...nc).
> My question is: what are these 6 levels?  I cannot find this information
> in the lsmh_...nc files themselves or in the on-line documentation
> (I'm using version CCM3.10).
>
> Thanks for any help,
> Gary
>
> _______________________________________________
> cam-users mailing list
> cam-users@ucar.edu
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>

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