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values of the height of the different vertical levels in WRF

PostPosted: Wed Sep 09, 2009 7:16 am
by guiyaum
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

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

PostPosted: Mon Jun 28, 2010 10:59 am
by b.glynn
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

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

PostPosted: Mon Jun 28, 2010 5:15 pm
by jimmyc
In WRF:
Pressure = P + PB
Geopotential height = (PH +PHB)/9.8

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

PostPosted: Sat Jan 07, 2017 1:46 am
by Jipson Johnson
Is the model height is measuring from above ground or above sea level?