Re: zonal_mpsi pressure level behavior

FYI: the f90 version of the code used by NCL is at:
     http://dss.ucar.edu/staff/davestep/SUBR_CCMP_ZM_MPSI.f90.html

The documentation is the basis for:

http://www.ncl.ucar.edu/Document/Functions/Contributed/zonal_mpsi_Wrap.shtml

====
I will have a look when I return to work.

D

On Tue, 2 Oct 2007, Chris Brierley wrote:

> Hi Folks,
>
> I've noticed some odd and undocumented behavior of the zonal_mpsi routine. The
> magnitude of the overturning appears to be rather sensitive to the pressure
> levels chosen. The documentation states that the top level cannot be above
> 5mb, so I'd chosen 150mb as my highest level. This choice roughly doubles the
> magnitude of the output!
>
> Having only sparse coverage in the upper atmosphere also acts to amplify the
> output. I don't really understand why this is the case, as the integration
> should go down to the surface for each level rather than requiring information
> above it. Can I ask for the documentation to strongly recommend using the
> example pressure levels to avoid over-estimation of the streamfunction,
> because I've spent a fair amount of time investigating the amount of vertical
> motion, trying to reconcile it with the over-estimated streamfunction?
>
> Cheers,
> Chris
>
>
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Received on Tue Oct 02 2007 - 09:55:01 MDT