Use the equation of state: P = rho*R*T, where P is pressure (lev has pressure in hPa in Grads), rho is air density, R is the dry air gas constant, and T is temperature. If you need to be really accurate, use virtual temperature Tv instead of T or use a weighted average gas constant for R.<br>
<br>Jeff Duda<br><br><div class="gmail_quote">On Mon, Mar 1, 2010 at 11:30 AM, Leopoldo Álvarez <span dir="ltr"><<a href="mailto:lalvarez@idemoc.com">lalvarez@idemoc.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Dear GrADS-users,<br>
<br>
Anyone have any script that calculates only Air Density (kg/m3) ?? for a<br>
point given (i,j) and for any length of time series...<br>
<br>
cheers,<br>
<br>
Leopoldo Álvarez<br>
<br>
--<br>
Leopoldo Álvarez<br>
Director de Explotación Técnica.<br>
Instituto de Estudios Meteorológicos y Oceanográficos S.L. (IDEMOC).<br>
<font color="#888888"><br>
--<br>
<a href="http://www.idemoc.com" target="_blank">www.idemoc.com</a><br>
</font></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Iowa State University<br>Meteorology Graduate Student<br>3134 Agronomy Hall<br><a href="http://www.meteor.iastate.edu/~jdduda">www.meteor.iastate.edu/~jdduda</a><br>