[gradsusr] how can i plotting Thickness on surface layer

[james]

Interesting.

However, we've never had any problems with this method - but this is for GFS 
model output. I don't know if the GFS model output gives geopotential height 
in a way which doesn't cause any problems.  Perhaps if its below surface level 
its a negative number? 

You may need more help for WRF output though as per Jeff's note.
Cheers
James


On Friday 27 Aug 2010 16:56:16 Jeffrey Duda wrote:
> I don't thihnk that will work.  Grads does not interpolate pressure levels
> that are below the surface.  Thus, if your 1000 mb pressure level goes
> below the surface at any point, you will not be able to use the method
> James presented for computing and displaying thickness of a layer that
> involves the surface.  In fact, as far as I know, you cannot compute the
> thickness of any layer that intersects the ground in Grads.  You'd have to
> find some way to get Grads to estimate the GPH of a pressure surface that
> is under ground,  perhaps using a script or a known formula somewhere.
> 
> Jeff Duda
> 
> On Fri, Aug 27, 2010 at 8:18 AM, james <james at weatherbadger.com> wrote:
> > Hi
> > 
> > Surely thickness is the measure of a distance between two layers?
> > 
> > To display 500-1000mb thickness (most popular) in dm.
> > 
> > I do
> > d (HGT500mb-HGT1000mb)/10
> > or
> > d (prs(lev=500)-prs(lev=1000))/10
> > 
> > depending on how your dataset is setup.
> > 
> > Good luck.
> > James
> > 
> > On Thursday 26 Aug 2010 21:09:53 AliReza Balalan Fard wrote:
> > > hi
> > > Dear GrADS colleagues,
> > > 
> > > i am working with WRF and i want to plotting the thickness on surface
> > 
> > layer
> > 
> > > , please help me
> > 
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