Correcting Surface Pressure to Sea Level

[Mark Hess]

Many thanks to all.  I have realized my error.  I was ordering and using the wrong variables in my GRIB files.  I was using the pressfc variable instead of prmsl. Mark

----- Original Message ----- 
  From: Stephen McMillan 
  To: GRADSUSR at LIST.CINECA.IT 
  Sent: Thursday, March 11, 2010 1:38 PM
  Subject: Re: Correcting Surface Pressure to Sea Level


  Mark,
  Have you tried plotting the "prmslmsl" (or similar name) variable?  It sounds like your trying to plot "pressfc" (or similar name).  Perhaps your file only has the one for surface pressure?
  Stephen Mc


  On Thu, Mar 11, 2010 at 3:16 PM, Mark Hess <mhess at oceani.com> wrote:

    I tried to access the GrADS User archives for this answer, but the page would not allow me to search.Perhaps someone can point me in the right direction.  When plotting surface pressure (isobars)  from the GFS GRIB files, my data show very low pressure values over land.  While not sure, I am guessing this is because the data need to be corrected to sea level.  Is this correct? If so, can someone provide a resource which explains how to 'correct' the data? If I am incorrect, Can you please explain what I am doing wrong? Thanks.

    Mark



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