No subject

(...)The summation is done for each layer present that is between the
bounds. The layers are determined by the Z levels of the default file.
Each layer is considered to be from the midpoints between the levels
actually present, and is assumed to have the same value throughout the
layer, namely the value of the gridpoint at the middle of the layer.

If ps<1000, e.g. 915mb, the integration will exclude all levels below 915mb.

If ps>1000, e.g., 1030mb, I guess (from the explanation above) that only levels
starting at 1000mb and above will be used... and the 30mb between ps and first
level will just be lost.

Sincerely,
Henrique

On Thu, Feb 28, 2008 at 8:33 PM, Remi Meynadier
<remi.meynadier at aero.jussieu.fr> wrote:
> Hi folks
>  I am using the vint fonction to integrate specific humidity to obtain
>  precipitable water.
>
>  This is what I ve done : vint(ps,q,100) with ps surface pressure.
>
>  What does the vint fonction do when the first pressure level (ie 1000hPa)
>  is above surface pressure ? An extrapolation from the first pressure level
>  ?
>
>  and in the same time what if ps is lower than 1000hPa ?
>
>  Thanks in advance
>  Regards
>
>
>  --
>  Rémi Meynadier
>  Institut Pierre Simon Laplace
>  Service d'Aéronomie du CNRS, UMR 7620
>  Université Pierre et Marie Curie
>  Tour 45-46, 3e étage, Case 102
>  4 place Jussieu, 75252 PARIS Cedex 05
>  Tél: 01 44 27 84 45 Fax: 01 44 27 37 76
>