about vint

[Henrique Barbosa]

Dear Kwan-yin,
The correct use of vint() is not the one you said, but:
vint(surface_pressure, variable_to_integrate, top_pressure)
It will do a mass integration from surface pressure until top pressure.To convince yourself, just try both and check which gives you theright answer... For instance, calculate precipitable water fromspecific humidity... It should give a number between 20-30 Kg/m^2(global avarege).
Cheers,
Henrique
On 10/16/06, Kwan-yin Kong <kongkwan at sci.ccny.cuny.edu> wrote:> Dong dong:>> I think the correct syntax is vint(expr,psexpr,top).>> I think sea-surface pressure is almost the same as surface> pressure, unless you only what to integrate the variable> in a very small depth.  How deep into the atmosphere do> you want to integrate?>> Kwan-yin Kong>> On Mon, 16 Oct 2006 20:33:42 +0800>   dongdong <happydong365 at YAHOO.COM.CN> wrote:> >hello everybody:> >    i have some troubles with function 'vint'. Can you> >help me? Thank you in advance!> >   1. which is the right function express,> >vint(expr,psexpr,top) or vint(psexpr,expr,top) ? In> >the web,it says vint(psexpr,expr,top) but in the GrADS> >document(v1.5.1.12),it is vint(expr,psexpr,top)> >   2. psexpr is surface pressure or sea surface> >pressure?> >   if it's surface pressure, do i have to change sea> >surface pressure to surface pressure (based on surface> >height)? is there another way ? (because i only have> >sea surface level pressure at hand,and don't have> >surface height datasets)> >> >   Thank you very much,and Best Regards!!!> >> >> >> >> >> >> >> >___________________________________________________________> >Mp3疯狂搜-新歌热歌高速下> >http://music.yahoo.com.cn/?source=mail_mailbox_footer>