values of the height of the different vertical levels in WRF

Discuss advection schemes, timestepping, pressure gradients, coordinates, etc.

values of the height of the different vertical levels in WRF

Postby guiyaum » Wed Sep 09, 2009 7:16 am

Hi,
I have been running WRF and I would like to know if anyone knows the mean to obtain the height (or pressure) corresponding to the different vertical levels.
thank you,
Guillaume
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Re: values of the height of the different vertical levels in WRF

Postby b.glynn » Mon Jun 28, 2010 10:59 am

Hello Guillaume

I see this post is a little dated but I'm going to share the solution for others who my be interested:

Atmospheric models solve the equations of motion in constant pressure coordinates so we'll be working with that.

If your doing this as a case study the hypsometric equation is going to give more accurate results, assuming to have a way to get Tmean, SP and rho for that day.

If your looking to forecast for..say..tomorrows 100m meter wind speed then using a spreadsheet to generalize the levels should work. Try this:

dP = rho * g dZ

ex:

dP = 1.225 * 9.81 * 100m

dP ~ 1.202 kPa

So your level would be .9778

You will need to change you surface P accordingly. Tuning your Params for such fine vertical resolutions is going to be more than half the battle.

Hope this helps.

BG
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Re: values of the height of the different vertical levels in WRF

Postby jimmyc » Mon Jun 28, 2010 5:15 pm

In WRF:
Pressure = P + PB
Geopotential height = (PH +PHB)/9.8
The views expressed in this message do not necessarily reflect those of NOAA or the National Weather Service or the University of Oklahoma.
James Correia, Jr
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Re: values of the height of the different vertical levels in

Postby Jipson Johnson » Sat Jan 07, 2017 1:46 am

Is the model height is measuring from above ground or above sea level?
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