ADVECTION FUNCTIONS

[Arlindo da Silva]

>
> ---------- Forwarded message ----------
> From: Diego Araneo <daraneo at lab.cricyt.edu.ar>
> Date: Wed, Jul 1, 2009 at 3:38 PM
> Subject: ADVECTION FUNCTIONS
> To: ddasilva at umd.edu
>
>
>  Hello Arlindo.
>
>
>
> In http://opengrads.org/doc/udxt/libbjt/, where it says -d(u*EXPR)/dx, it
> should say -u*d(EXRR)/dx.
>
>
>
> I hope the last is the real expression the command function calculates.
>
>
>

I am not sure what you are refering to. There are 2 kind of functions under
the "Advection Functions" banner. These are actually advection, e.g., u d
EXPR/ dx, etc.


display *muadv*(*U*,*EXPR*) - Changing rate [EXPR/s] due to zonal advection

display *mvadv*(*V*,*EXPR*) - Changing rate [EXPR/s] due to meridional
advection

display *mwadv*(*W*,*EXPR*) - Changing rate [EXPR/s] due to vertical
advection
Now, these are actually components of the flux gradient:

display *madvu*(*U,EXPR*) - Zonal flux gradient: -d(U*EXPR)/dx

display *madvv*(*V,EXPR*) - Meridional flux gradient: -d(V*EXPR)/dy

display *madvw*(*W,EXPR*) - Vertical flux gradient: -d(W*EXPR)/dz
These are useful for budget calculations (say, divergence of moisture flux ~
E - P).

    Arlindo

--
Arlindo da Silva
dasilva at alum.mit.edu
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